CN104332506A - Photovoltaic cell and printing screen plate used for printing gate lines of photovoltaic cell - Google Patents

Photovoltaic cell and printing screen plate used for printing gate lines of photovoltaic cell Download PDF

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Publication number
CN104332506A
CN104332506A CN201410526022.1A CN201410526022A CN104332506A CN 104332506 A CN104332506 A CN 104332506A CN 201410526022 A CN201410526022 A CN 201410526022A CN 104332506 A CN104332506 A CN 104332506A
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grid line
photovoltaic cell
thin grid
printing
half tone
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CN104332506B (en
Inventor
黄强
黄家烨
刘江峰
耿晓菊
夏燕杰
冯岩
程涛
韩会丽
彭琪
陈华
余本海
刘彦明
卢克平
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Xinyang Normal University
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Xinyang Normal University
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0224Electrodes
    • H01L31/022408Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F15/00Screen printers
    • B41F15/14Details
    • B41F15/34Screens, Frames; Holders therefor
    • B41F15/36Screens, Frames; Holders therefor flat
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

The invention relates to the technical field of a photovoltaic assembly, and particularly relates to a photovoltaic cell and a printing screen plate used for printing the gate lines of the photovoltaic cell. The light-receiving surface of the photovoltaic cell is provided with the gate lines. The cross section of the fine gate lines decreases with increasing distance of electrical connection points with the closest spacing distance. The fine gate lines arranged between the two adjacent electrical connection points are provided with pre-breaking gates. The printing screen plate used for printing the gate lines comprises a wire screen plate and a metal plate screen plate. The wire screen plate is matched with the change of the cross section of the fine gate lines via adjusting spacing distance and diameter of longitudinal screen wires. Transparent rate of the screen plate hole arrays of the metal plate screen plate is adjusted so that the change of the cross section of the fine gate lines is realized. The beneficial effects of the invention are that use amount of precious metal for manufacturing the gate lines is greatly reduced without reducing current collection capability or product quality. Besides, the pre-breaking gates are used, and defects like broken gates only occur at the predesigned positions so that influence of the defects is controlled and reliability and safety of the photovoltaic cell are greatly enhanced.

Description

Photovoltaic cell and the printing screen plate for printing its grid line
Technical field
The present invention relates to photovoltaic module technical field, particularly a kind of photovoltaic cell and the printing screen plate for printing its grid line.
Background technology
Since 2004, Chinese photovoltaic cell manufacture and application fast development.At present, China is not only the photovoltaic manufacture big country in the whole world first, has also become the maximum photovoltaic market in the whole world simultaneously.Maintenance grows at top speed by manufacture and the application of following photovoltaic generation product.Precious metals ag, as the core material in photovoltaic cell product, obtains the huge concern of industrial circle always.In different occasions such as European photovoltaic technology meeting, Shanghai photovoltaic technology exhibitions, can the technical specialist of photovoltaics circle such as Martin Green illustrate the worry that meet photovoltaic development to following Ag output.Reduce Ag use consumption in the photovoltaic cells, find the battery electrode design that can replace or partly replace Ag simultaneously, become the common recognition of photovoltaic industry expert.In the utility model patent CN 203250753U of electric (Nanjing) Photovoltaics Com Inc. of middle electricity, fairly simplely clearly describe existing electrode design technology.
The research direction of current industry mainly contains 5: 1) with the Yin Jiang company that Du Pont and load forces scholar company are representative, mainly to reduce the Ag consumption in silver slurry, thin for Ag grid line is printed more " tall and thin " simultaneously.2) with the photovoltaic module manufacturer that Trina Solar etc. is representative, Ag consumption in main gate line is mainly reduced in silk screen printing.As utility model patent ZL200920041761.6 and the utility model patent CN202076273U that improves on this basis, it is all the method for saving Ag consumption by reducing main grid silver slurry consumption.3) with the photovoltaic module manufacturer that still moral electric power is representative, adopt " Pluto " technology, namely use the mode of Ni/Cu/Sn tri-layers plating thin conduction grid line.Because plating requires high to the reprocessing of environmental protection, there is technical difficulty in weldability, needs the reasons such as investment new equipment, be difficult to introduce to the market.4) company such as to change into for representative with Hitachi, attempt to carry out part by conducting film (CF) film and replace conductive silver paste under photovoltaic cell main gate line.5) with Japanese industries comprehensive study institute (AIST) for representative, attempt to replace Ag slurry by conductive copper slurry, the research in this direction has just just started starting.
In these 5 kinds of modes, the 1st) and the 2nd) kind method, in the industry cycle extensively adopt.Other are several still among trial.No matter take which kind of mode, its main target is all meeting in the harsh reliability requirement situation of photovoltaic cell, reducing costs to greatest extent.
Summary of the invention
Technical problem to be solved by this invention is: the consumption reducing the noble metal of photovoltaic cell.
The technical solution adopted for the present invention to solve the technical problems is: a kind of photovoltaic cell, at the sensitive surface of cell piece, there is grid line, grid line is made up of main gate line and thin grid line, thin grid line has electric connection point, thin grid line is electrically connected with interconnecting strip by main gate line at electric connection point place, far away apart from immediate electric connection point, the sectional area of thin grid line is less, the distance at this place does not refer to the distance of air line distance spatially and refers to the distance of electric current carrying pathway, the trend that sectional area reduces is continuous print or discontinuous transition, and thin grid line reduces the sectional area of thin grid line by the height reducing thin grid line, or described grid line is only made up of thin grid line, thin grid line is directly electrically connected with interconnecting strip at electric connection point place, far away apart from immediate electric connection point, the sectional area of thin grid line is less, the trend that sectional area reduces is continuous print or discontinuous transition, and thin grid line reduces the sectional area of thin grid line by the height reducing thin grid line.
Further restriction, the thin grid line between adjacent two electric connection points has and prejudges grid.
Further restriction, the width of prejudging grid is D, 0mm < D≤3mm.
Further restriction, prejudges the centre position that grid are positioned at thin grid line.
Further restriction, when grid line is only made up of thin grid line, the quantity of interconnecting strip is 18 ~ 50.
Further restriction, interconnecting strip is electrically connected by the mode of welding or conducting resinl bonding.
For realizing the design of above-mentioned grid line, the invention provides a kind of photovoltaic cell screen printing screens, comprise half tone skeleton and be fixed on the silk screen on half tone skeleton, silk screen is made up of interlaced horizontal twine and longitudinal twine, silk screen is formed by the mode of mask film covering open-work district and the mask regions of printing grid line, the bearing of trend for the Xi Shan open-work district printing thin grid line in open-work district is consistent with the bearing of trend of horizontal twine, interval between the diameter of horizontal twine and horizontal twine is identical, in Xi Shan open-work district, interval between longitudinal twine is identical, longitudinal diameter of twine and the sectional area of thin grid line to be printed are inversely proportional to, or the diameter of longitudinal twine is identical, the interval between longitudinal twine is directly proportional to the sectional area of thin grid line to be printed, or the sectional area of the diameter of longitudinal twine and thin grid line to be printed is inversely proportional to, the interval simultaneously between longitudinal twine is directly proportional to the sectional area of thin grid line to be printed.
For realizing the design of above-mentioned grid line, the present invention provides a kind of photovoltaic cell metal sheet printing half tone in addition, comprise metallic plate, offer the half tone opening array be made up of half tone perforate on a metal plate, half tone opening array is formed by the mode of mask film covering open-work district and the mask regions of printing grid line, in open-work district for printing in the Xi Shan open-work district of thin grid line, the Penetration ration of half tone opening array is directly proportional to the sectional area of thin grid line to be printed.
Further restriction, half tone perforate is simple geometry figure, is preferably oval or rectangle.
The invention has the beneficial effects as follows: while not reducing electric current collection ability and photovoltaic products quality, significantly lower the use amount of the noble metal making grid line.Secondly, facilitate the defects such as disconnected grid only to appear at the position designed in advance by prejudging grid, thus control the impact of defect, greatly promote reliability and the fail safe of photovoltaic cell.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described;
Fig. 1 is the overall structure schematic diagram of the grid line of current photovoltaic cell;
Fig. 2 is the vertical view after the thin grid line ratio exaggeration in Fig. 1;
Fig. 3 is the end view after the thin grid line ratio exaggeration in Fig. 1;
Fig. 4 is the overall structure schematic diagram of the grid line of embodiments of the invention 1 photovoltaic cell;
Fig. 5 is the vertical view after the thin grid line ratio exaggeration of embodiments of the invention 1;
Fig. 6 is the end view after the thin grid line ratio exaggeration of embodiments of the invention 1;
Fig. 7 is the vertical view after the thin grid line ratio exaggeration of embodiments of the invention 2;
Fig. 8 is the vertical view after the thin grid line ratio exaggeration of embodiments of the invention 3;
Fig. 9 is the end view after the thin grid line ratio exaggeration of embodiments of the invention 3;
Figure 10 is the electricity fed distance of thin grid line under the interconnecting strip of different radical of the present invention and the graph of a relation containing the Ag slurry saving upper limit;
Figure 11 a is the partial enlarged drawing of the first screen mesh printing plate before mask process of the present invention;
Figure 11 b is the partial enlarged drawing of the first screen mesh printing plate after mask process of the present invention;
Figure 11 c is the partial enlarged drawing of the second screen mesh printing plate of the present invention;
Figure 11 d is the partial enlarged drawing of the 4th kind of screen mesh printing plate of the present invention;
Figure 12 a is the partial enlarged drawing of the first the metallic plate half tone before mask process of the present invention;
Figure 12 b is the partial enlarged drawing of the first the metallic plate half tone after mask process of the present invention;
Figure 12 c is the partial enlarged drawing of the second metallic plate half tone before mask process of the present invention;
Figure 12 d is the partial enlarged drawing of the second metallic plate half tone after mask process of the present invention;
Figure 12 e is the partial enlarged drawing of the third metallic plate half tone before mask process of the present invention;
Figure 12 f is the partial enlarged drawing of the third metallic plate half tone after mask process of the present invention;
In figure, 1. thin grid line, 2. main gate line, 3. interconnecting strip, 4. prejudge grid, 5. horizontal twine, 6. longitudinal twine, 7. mask, and 7-1. forms the mask of prejudging grid, 8. Xi Shan open-work district, 9. metallic plate, 10. half tone perforate.
Embodiment
Core of the present invention is the photovoltaic cell sensitive surface grid line design adopting a kind of non-homogeneous formula, while not reducing electric current collection ability and photovoltaic products quality, significantly lowers the use amount of the noble metal (being generally Ag) making grid line.The noble metal dosage of the thin grid line 1 at the electric connection point place near grid line and interconnecting strip 3 is maximum, and electric conductivity is best.Relatively minimum at the noble metal dosage of the thin grid line 1 of the electric current collection end section farthest away from electric connection point, electric conductivity is the most weak.Closest to electric connection point and the noble metal dosage transition gradually farthest away from the thin grid line 1 between electric connection point.
Below on the basis introducing existing electrode design, comparative illustration feature of the present invention.
Common photovoltaic cell is generally 125 × 125mm or 156 × 156mm, two kinds of specifications, and main gate line 2 is typically designed to 2 ~ 5.Fig. 1,2 and 3 gives the typical grid line design of existing general photovoltaic cell.The specification of photovoltaic cell is 156 × 156mm in FIG, and the sensitive surface of this photovoltaic cell has 3 main gate line 2, and 60 ~ 80 width are 30 ~ 120um, and be highly the thin grid line 1 of 15 ~ 30um, thin grid line is for being uniformly distributed design.Main gate line 2 and thin grid line 1 are by the sensitive surface being transferred to photovoltaic cell containing Ag slurry by the mode of silk screen printing, and then at the temperature of 500 ~ 900 DEG C, high temperature sintering forms.Thisly generally be made up of conductive phase Ag powder, inorganic binder frit, organic carrier and the trace mineral supplement that improves battery performance containing Ag slurry, complicated process of preparation, price is high.For reducing containing Ag cost of sizing agent, measuring containing Ag containing reducing in the formula of Ag slurry of usual main gate line 2, and reduced costs by the mode of hollow out.Interconnecting strip 3 is electrically connected with thin grid line 1 at electric connection point place by main gate line 2 by the mode of welding or conducting resinl bonding, and interconnecting strip 3 comprises copper soldering band, copper indium welding.
Embodiment 1, as shown in Fig. 4,5 and 6:
A kind of photovoltaic cell, at the sensitive surface of cell piece, there is grid line, grid line is only made up of thin grid line 1, omit main gate line 2, thin grid line 1 has electric connection point, and thin grid line 1 is directly electrically connected with interconnecting strip 3 at electric connection point place, and the quantity of interconnecting strip 3 is 18 ~ 50, in the drawings, the radical of interconnecting strip 3 is 22.The Ag consumption cost of the main gate line 2 saved accounts for photovoltaic cell containing 1/3 of Ag cost of sizing agent, is a marked improvement.
For the design of 3 main gate line 2, the transmission range of thin grid line 1 is 52mm; For the design of 22 interconnecting strip 3, the transportation range of thin grid line 1 is 7mm.Reach same transmittability, the conduction bearing capacity of thin grid line 1 requires to reduce 8 times.For the design of 30 interconnecting strip 3, the transportation range of thin grid line 1 is 3.9mm, and the conduction bearing capacity of thin grid line 1 requires to reduce 10 times.The current capacity of this part has been directly transferred in interconnecting strip 3, is equivalent to use interconnecting strip 3 to instead of the grid line of noble metal material.The design of significantly many interconnecting strip 3 is shown in Figure 10 to the interaction containing Ag usage of sizing agent.
Far away apart from immediate electric connection point, the sectional area of thin grid line 1 is less, makes the noble metal dosage of the thin grid line of electric current collection end section 1 relatively minimum, can save the consumption of Ag in a large number.In this embodiment, the width of the thin grid line 1 of photovoltaic cell is consistent, as broad as long with the design of the thin grid line 1 of existing photovoltaic cell in Fig. 1,2 and 3, thin grid line 1 reduces the sectional area of thin grid line 1 by the height reducing thin grid line 1, far away apart from immediate electric connection point, the height of thin grid line 1 is less, and the trend of height reduction can be non-continuous transition.The design of thin grid line 1 is compared with thin grid line 1 design of existing photovoltaic cell can save about about 10% Ag consumption.
Embodiment 2, as shown in Figure 7,
Compare with embodiment 1, the width of the thin grid line 1 of photovoltaic cell and be highly all inconsistent, thin grid line 1 reduces the sectional area of thin grid line 1 by the height and width reducing thin grid line 1 simultaneously, far away apart from immediate electric connection point, the height of thin grid line 1 is less, and the width of thin grid line 1 is less.
Embodiment 3, as shown in FIG. 8 and 9,
Compare with embodiment 1, the trend of thin grid line 1 height reduction is continuous transition, and thin grid line 1 between adjacent two electric connection points has prejudges grid 4.The width of prejudging grid 4 is D, 0mm < D≤3mm.Prejudge the centre position that grid 4 are positioned at thin grid line 1.In the diagram, suppose there are 78 horizontally disposed thin grid lines 1, and have 22 vertically disposed interconnecting strip 3 then have (22-1) × 78=1638 to prejudge grid 4.
The effect of prejudging grid 4 is: the grid line of photovoltaic cell, in printing process, disconnected grid phenomenon often can occur; and the position that disconnected grid occur is all untrue; have impact on the collection of grid line to electric current greatly; and in the present embodiment by thin grid line 1 to cell current collection ability and reliability effect minimum place design prejudge grid 4; prejudge the stress that grid 4 can cut down the weak spot that disconnected grid may occur, the weak spot that disconnected grid may occur can not be broken grid.Prejudge grid 4 to be also conducive to reducing the consumption containing Ag slurry simultaneously.
In embodiment 1 and 2, because minimum at the sectional area in the centre position of grid line 1 thin between adjacent two electric connection points, when there is the factor of disconnected grid, also can preferentially rupture in this middle part, also has the effect preventing other parts of thin grid line 1 from disconnected grid occurring to a certain extent.
According to the thought of above-mentioned example 1,2 and 3, the engineers and technicians of the industry are very easy to draw inferences about other cases from one instance, and combine the method for embodiment 1,2 and 3, for these changes, all belong to the scope of invention protection, repeat no longer one by one in patent of the present invention.
For more simply and visually essence of the present invention being described, thought of the present invention can carry out analogy with the structure of the leaf of the Nature (or Human vascular).The feature of these transport pipelines is that more to arrive end more tiny, and reason is that the collection born of the pipeline of this section of end and the load that transports are also minimum.What common tree leaf vein or conventional vascular adopted is commaterial, and the Nature cannot adopt different materials, therefore have employed the simplest biological design.In the present invention, the electrode material of photovoltaic cell is changed into 2 kinds (high containing the thin grid line of Ag and interconnecting strip) from original 3 kinds (high containing the thin grid line of Ag, low containing Ag main gate line and interconnecting strip), simultaneously, increase considerably the quantity of interconnecting strip 3, the transportation range of thin grid line 1 is reduced greatly.
For realizing above-mentioned grid line design, the present invention discloses a kind of photovoltaic cell screen printing screens simultaneously:
The first of this photovoltaic cell screen printing screens is designed to:
As shown in figures 1 la and 1 lb, this screen printing screens is used for realizing embodiment 1, comprise half tone skeleton and be fixed on the silk screen on half tone skeleton, silk screen is made up of interlaced horizontal twine 5 and longitudinal twine 6, silk screen has the open-work district for printing grid line, other region overlay masks 7 of silk screen outside open-work district, because the sensitive surface of the photovoltaic cell of embodiment 1 only has thin grid line 1, therefore the open-work district of screen printing screens only comprises the Xi Shan open-work district 8 for printing thin grid line 1, the bearing of trend in Xi Shan open-work district 8 is consistent with the bearing of trend of horizontal twine 5, namely the bearing of trend of horizontal twine 5 is consistent with the bearing of trend of thin grid line 1 to be printed, interval between the diameter of horizontal twine 5 and horizontal twine 5 is identical, the preparation method of mask 7 is: on silk screen, first apply photosensitive colloid coating, mask regions and open-work district is formed by the method for exposure imaging and corrosion, the surface of photovoltaic cell will be printed onto by open-work district containing Ag slurry.In Xi Shan open-work district 8, interval between longitudinal twine 6 is identical, longitudinal diameter of twine 6 and the sectional area of thin grid line 1 to be printed are inversely proportional to, like this in the printing manufacture process of photovoltaic cell, when being leaked down to battery surface by open-work district containing Ag slurry, just can form the non-homogeneous grid line of embodiment 1.
The second of this photovoltaic cell screen printing screens is designed to:
As shown in fig. live, compare with the first design of screen printing screens, difference is, in Xi Shan open-work district 8, the diameter of longitudinal twine 6 is identical, and the interval between longitudinal twine 6 is directly proportional to the sectional area of thin grid line 1 to be printed.
The third of this photovoltaic cell screen printing screens is designed to:
Compare with the first design of screen printing screens, difference is, in Xi Shan open-work district 8, the diameter of longitudinal twine 6 and the sectional area of thin grid line 1 to be printed are inversely proportional to, and the interval simultaneously between longitudinal twine 6 is directly proportional to the sectional area of thin grid line 1 to be printed.
4th kind of design of this photovoltaic cell screen printing screens:
As illustrated in fig. 1 ld, this screen printing screens is used for realizing embodiment 3, compare with the first design of screen printing screens, difference is, in Xi Shan open-work district 8, the diameter of longitudinal twine 6 is identical, interval between longitudinal twine 6 is directly proportional to the sectional area of thin grid line 1 to be printed, between Mei Tiaoxishan open-work district 8, have the mask 7-1 being formed and prejudge grid, namely nearer apart from forming the mask 7-1 prejudging grid, the twine interval of longitudinal twine 6 is less.
For realizing above-mentioned grid line design, except above-mentioned screen printing screens, invention further discloses a kind of photovoltaic cell metal sheet printing half tone:
This metal sheet printing half tone comprises metallic plate 9, metallic plate 9 is offered the half tone opening array be made up of half tone perforate 10, half tone opening array is formed by the mode of mask film covering 7 open-work district and the mask regions of printing grid line, in open-work district for printing in the Xi Shan open-work district 8 of thin grid line 1, the Penetration ration of half tone opening array is directly proportional to the sectional area of thin grid line 1 to be printed.The advantage of photovoltaic cell metal sheet printing half tone is: the projection of braiding node knit-mesh can being avoided to cause on the one hand, realizes being in conplane silk-screen patterns completely, can print out the grid line that depth-width ratio is higher; On the other hand, metal sheet printing half tone also by the change of half tone opening array pattern, more easily at the different parts of grid line, can realize different Penetration ration.Therefore, the printing of amassing grid line for nonuniform section of the present invention is particularly suitable for.
The first design of this photovoltaic cell metal sheet printing half tone:
As shown in figures 12 a and 12b, this metal sheet printing half tone is used for realizing embodiment 1, on metallic plate 9, logical overetched mode forms the half tone opening array of the silk-screen patterns being similar to Figure 11 a and 11b, metallic plate 9 is Thin Stainless Steel plate material, the half tone perforate 10 of half tone opening array is square, half tone opening array is formed by the mode of mask film covering 7 open-work district and the mask regions of printing grid line, because the sensitive surface of the photovoltaic cell of embodiment 1 only has thin grid line 1, therefore the open-work district of metallic plate half tone only comprises the Xi Shan open-work district 8 for printing thin grid line 1, in Xi Shan open-work district 8, the Penetration ration of half tone opening array is heterogeneous, be directly proportional to the sectional area of thin grid line 1 to be printed.Half tone opening array can only in open-work district and periphery certain limit thereof, the preparation method of mask 7 is: first on half tone opening array, apply photosensitive colloid coating, on half tone opening array, mask regions and open-work district is formed by the method for exposure imaging and corrosion, the surface of photovoltaic cell will be printed onto by the half tone perforate 10 in open-work district containing Ag slurry, because the Penetration ration of half tone opening array is heterogeneous, the non-homogeneous grid line of embodiment 1 so just can be formed.
The second design of this photovoltaic cell metal sheet printing half tone:
As shown in Figure 12 c and Figure 12 d, the half tone opening array pattern of metallic plate half tone is not identical with silk-screen patterns, although it is all square for comparing half tone perforate 10 with the first design of metal sheet printing half tone, but the bearing of trend that the longitudinal direction in Mei Tiaoxishan open-work district 8 only has row's half tone perforate 10, Mei Tiaoxishan open-work district 8 is laterally, far away apart from immediate electric connection point, the sectional area of thin grid line 1 is less, and the Penetration ration of half tone opening array is lower, and the aperture of half tone perforate 10 is less.
The third design of this photovoltaic cell metal sheet printing half tone:
As shown in Figure 12 e and Figure 12 f, compare with the second design of metal sheet printing half tone, difference is, half tone perforate 10 is oval, far away apart from immediate electric connection point, and the aperture of oval half tone perforate 10 is less.
In fact, the half tone perforate 10 of metallic plate half tone can also adopt the figure of other shapes, and as regular hexagon, positive five distortion etc., have not just repeated here one by one.Being familiar with those skilled in the art can be easy to just draw inferences about other cases from one instance, doing reasonable distortion when not changing inventive principle.

Claims (10)

1. a photovoltaic cell, at the sensitive surface of cell piece, there is grid line, it is characterized in that: described grid line is made up of main gate line and thin grid line, thin grid line has electric connection point, thin grid line is electrically connected with interconnecting strip by main gate line at electric connection point place, far away apart from immediate electric connection point, and the sectional area of thin grid line is less, the trend that sectional area reduces is continuous print or discontinuous transition, and thin grid line reduces the sectional area of thin grid line by the height reducing thin grid line;
Or described grid line is only made up of thin grid line, thin grid line is directly electrically connected with interconnecting strip at electric connection point place, far away apart from immediate electric connection point, the sectional area of thin grid line is less, the trend that sectional area reduces is continuous print or discontinuous transition, and thin grid line reduces the sectional area of thin grid line by the height reducing thin grid line.
2. photovoltaic cell according to claim 1, is characterized in that: the thin grid line between adjacent two electric connection points has and prejudges grid.
3. photovoltaic cell according to claim 2, is characterized in that: the described width of prejudging grid is D, 0mm < D≤3mm.
4. photovoltaic cell according to claim 2, is characterized in that: described prejudges the centre position that grid are positioned at thin grid line.
5. photovoltaic cell according to claim 1, is characterized in that: when described grid line is only made up of thin grid line, and the quantity of interconnecting strip is 18 ~ 50.
6. photovoltaic cell according to claim 1, is characterized in that: described interconnecting strip is electrically connected by the mode of welding or conducting resinl bonding.
7. one kind for printing the photovoltaic cell screen printing screens of the grid line of the sensitive surface of the photovoltaic cell described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that: comprise half tone skeleton and be fixed on the silk screen on half tone skeleton, described silk screen is made up of interlaced horizontal twine and longitudinal twine, silk screen is formed by the mode of mask film covering open-work district and the mask regions of printing grid line
The bearing of trend for the Xi Shan open-work district printing thin grid line in open-work district is consistent with the bearing of trend of horizontal twine, and the interval between the diameter of horizontal twine and horizontal twine is identical,
In Xi Shan open-work district, the interval between longitudinal twine is identical, and the diameter of longitudinal twine and the sectional area of thin grid line to be printed are inversely proportional to; Or the diameter of longitudinal twine is identical, the interval between longitudinal twine is directly proportional to the sectional area of thin grid line to be printed; Or the sectional area of the diameter of longitudinal twine and thin grid line to be printed is inversely proportional to, the interval simultaneously between longitudinal twine is directly proportional to the sectional area of thin grid line to be printed.
8. one kind for printing the photovoltaic cell metal sheet printing half tone of the grid line of the sensitive surface of the photovoltaic cell described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that: comprise metallic plate, offer the half tone opening array be made up of half tone perforate on a metal plate, half tone opening array is formed by the mode of mask film covering open-work district and the mask regions of printing grid line
In open-work district for printing in the Xi Shan open-work district of thin grid line, the Penetration ration of half tone opening array is directly proportional to the sectional area of thin grid line to be printed.
9. go up described photovoltaic cell metal sheet printing half tone according to Claim 8, it is characterized in that: described half tone perforate is simple geometry figure.
10., according to photovoltaic cell metal sheet printing half tone described in claim 9, it is characterized in that: described half tone perforate is oval or rectangle.
CN201410526022.1A 2014-09-30 2014-09-30 Photovoltaic cell and printing screen plate used for printing gate lines of photovoltaic cell Active CN104332506B (en)

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CN105136140A (en) * 2015-09-24 2015-12-09 北京控制工程研究所 Photoelectric assembly for biaxial miniature analog type sun sensor
CN109980023A (en) * 2017-12-27 2019-07-05 阿特斯阳光电力集团有限公司 Photovoltaic cell and photovoltaic module
CN111806060A (en) * 2020-07-09 2020-10-23 昆山乐邦精密科技有限公司 Method for removing screen by etching screen
CN113211948A (en) * 2020-01-21 2021-08-06 宁夏隆基乐叶科技有限公司 Screen printing screen plate for solar cell and preparation method of solar cell

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CN103171264A (en) * 2011-12-23 2013-06-26 昆山允升吉光电科技有限公司 Solar energy battery electrode printing screen plate
CN102756540A (en) * 2012-08-06 2012-10-31 无锡嘉瑞光伏有限公司 Printing plate for photovoltaic cell screen printing technology
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CN105136140A (en) * 2015-09-24 2015-12-09 北京控制工程研究所 Photoelectric assembly for biaxial miniature analog type sun sensor
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CN113211948A (en) * 2020-01-21 2021-08-06 宁夏隆基乐叶科技有限公司 Screen printing screen plate for solar cell and preparation method of solar cell
CN111806060A (en) * 2020-07-09 2020-10-23 昆山乐邦精密科技有限公司 Method for removing screen by etching screen

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