CN203637327U

CN203637327U - Scraper bar

Info

Publication number: CN203637327U
Application number: CN201320883476.5U
Authority: CN
Inventors: 李翠双; 张晓朋
Original assignee: Yingli Group Co Ltd
Current assignee: Yingli Group Co Ltd
Priority date: 2013-12-30
Filing date: 2013-12-30
Publication date: 2014-06-11
Anticipated expiration: 2023-12-30

Abstract

The utility model provides a scraper bar. The scraper bar comprises a body (10), the body (10) is provided with an edge, the edge serves as a blade (11). The scraper bar further comprises a protrusion (12), and the protrusion (12) is arranged at the corresponding main grid line forming position on the blade (11). By applying the technical scheme, the conversion efficiency of a battery piece can be improved, and the cost can be also reduced.

Description

Scraper strip

Technical field

The utility model relates to technical field of solar cell manufacturing, in particular to a kind of scraper strip.

Background technology

At present, the main flow process of the production of crystal silicon solar energy battery is: deposition, serigraphy and the sintering of making herbs into wool, diffusion, wet etching, antireflective coating.The electrode wires (grid line) in silicon solar cell front and the aluminium back surface field at the back side are the front and backs that by silk-screen printing technique, slurry is printed onto to silicon chip, then form through super-dry and sintering process.

Grid line on solar battery sheet generally comprises main grid line and thin grid line, and thin grid line is the positive electrode of solar cell, thereby can collect to greatest extent the photo-generated carrier formation electric current that solar cell surface produces.Main grid line is the both positive and negative polarity of solar cell, collects the electric current that inside solar energy battery produces.The Main Function of main grid line is to be connected with external circuit or load, and single solar battery sheet solder interconnections is become to solar panel.

Serigraphy is to utilize the mesh on silk screen to see through slurry, and the slurry on silk screen applies certain pressure with scraper, and under the effect of pressure, slurry is expressed on silicon chip by scraper from mesh.In printing process, scraper is linear with silk screen all the time and contact, and contact wire moves with scraper and movement, thereby completes print stroke.In prior art, scraper comprises scraper strip, and scraper strip is arranged on scraper.Generally, scraper strip is the quadrangular rubber strip with certain degree of hardness, certain elasticity and certain setting angle, and the blade of scraper strip is a level and smooth linear.

In order to make thin grid line collected current to greatest extent, should reduce as much as possible series resistance, and then require thin grid line to have large as far as possible depth-width ratio.The thin less width of grid line has reduced shading-area, can increase light-receiving area.The thin larger height of grid line has increased grid line cross-sectional area, can reduce series resistance and then reduce power loss.Main grid line is required to have good solderability and forms and good contact just passablely with tin-plating belt, therefore, can reduce the silver slurry consumption on main grid line, and then the manufacturing cost of reduction solar cell.

But the pressure that main grid line and thin grid line are subject in the process of printing is identical, in the time adjusting doctor position, in silk screen, the variation of each position pressure is also identical.The slurry that is printed onto like this cell piece is all identical at main grid line with the height on thin grid line.If the pressure of scraper is large, the height of slurry leading, on thin grid line all can reduce, and can save slurry like this but can reduce the conversion efficiency of cell piece.If the pressure of scraper is little, the height of slurry leading, on thin grid line all can raise, and improved the conversion efficiency of cell piece but wasted the slurry on main grid line.

Utility model content

The utility model aims to provide the scraper strip that a kind of conversion efficiency that can improve cell piece can reduce costs again.

To achieve these goals, the utility model provides a kind of scraper strip, comprising: body, and body has seamed edge, and seamed edge forms blade, and scraper strip also comprises projection, and projection is arranged on the corresponding position that forms main grid line on blade.

Further, the width along blade bearing of trend of projection is identical with the width of main grid line.

Further, the height that projection protrudes from blade is in the scope of 1 μ m～5 μ m.

Further, projection along the thickness perpendicular to blade bearing of trend in the scope of 1 μ m～5 μ m.

Further, the number of projection is identical with the number of main grid line.

Further, projection is rectangular-shaped.

Further, body comprises many seamed edges, and a seamed edge in many seamed edges forms blade.

Further, body is quadrangular shape.

Application the technical solution of the utility model, scraper strip also comprises projection, projection is arranged on blade and the corresponding position that forms main grid line.Like this, in the process of serigraphy, when scraper strip contacts with silk screen, projection is large to the pressure of silk screen, has reduced the distance of silk screen and cell piece, has so effectively reduced the height that forms the slurry of the position of main grid line, has saved slurry, has reduced production cost.Meanwhile, the scraper strip of position that forms thin grid line is little to the pressure of silk screen, has increased the distance of silk screen and cell piece, and the height of the slurry of the position that forms thin grid line has been raise.The cross-sectional area that has increased so thin grid line, has reduced series resistance, and then reduces power loss, improves the conversion efficiency of battery.

Accompanying drawing explanation

The Figure of description that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 shows according to the structural representation of the embodiment mono-of scraper strip of the present utility model;

The scraper strip that Fig. 2 shows Fig. 1 coordinates printing state schematic diagram with silk screen; And

Fig. 3 shows according to the structural representation of the embodiment bis-of scraper strip of the present utility model.

Above-mentioned accompanying drawing comprises the following drawings mark:

10, body; 11, blade; 12, projection; 20, slurry; 30, cell piece; 40, silk screen.

The specific embodiment

It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.

As depicted in figs. 1 and 2, the scraper strip of embodiment mono-comprises body 10 and projection 12, and body 10 comprises many seamed edges, and in embodiment mono-, body 10 is quadrangular shape.Article four, a seamed edge in seamed edge forms blade 11, and projection 12 is arranged on the corresponding position that forms main grid line on blade 11.

The scraper strip of application the present embodiment, scraper strip also comprises projection 12, projection 12 is arranged on blade 11 and the corresponding position that forms main grid line.Like this, in the process of printing at silk screen 40, when scraper strip contacts with silk screen 40, the pressure of 12 pairs of silk screens 40 of projection is large, has reduced the distance of silk screen 40 with cell piece 30, has so effectively reduced the height that forms the slurry 20 of the position of main grid line, save slurry 20, reduced production cost.Meanwhile, the scraper strip of position that forms thin grid line is little to the pressure of silk screen 40, has increased the distance of silk screen 40 with cell piece 30, and the height of the slurry 20 of the position that forms thin grid line has been raise.The cross-sectional area that has increased so thin grid line, has reduced series resistance, and then reduces power loss, improves the conversion efficiency of battery.

In order to reduce costs, in embodiment mono-, the width along blade 11 bearing of trends of projection 12 is identical with the width of main grid line.

In order effectively to reduce costs and improve the efficiency of battery, in embodiment mono-, projection 12 height that protrude from blade 11 are in the scope of 1 μ m～5 μ m.

In order to strengthen projection 12 intensity, in embodiment mono-, projection 12 along the thickness perpendicular to blade 11 bearing of trends in the scope of 1 μ m～5 μ m.

As shown in Figure 1, in embodiment mono-, the number of projection 12 is three.The corresponding position that forms main grid line, position of projection 12.

In embodiment mono-, projection 12 is rectangular-shaped.Certainly, the cross sectional shape of projection also can shape triangular in shape.Preferably, body 10 can be rectangular-shaped.Certainly, body also can be pentagonal prism shape.

Fig. 3 shows the structure of the embodiment bis-of the application's scraper strip, and the difference of the scraper strip of embodiment bis-and embodiment mono-is the number of projection 12, and in embodiment mono-, the number of projection 12 is three, and in embodiment bis-, the number of projection 12 is two.In addition, the number of projection 12 can be four or five.Certainly, the number of projection is not limited to this, and the number of projection is identical with the quantity of main grid line.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. a scraper strip, comprising: body (10), and described body (10) has seamed edge, described seamed edge forms blade (11), it is characterized in that, described scraper strip also comprises projection (12), and described projection (12) is arranged on the upper corresponding position that forms main grid line of described blade (11).

2. scraper strip according to claim 1, is characterized in that, the width along described blade (11) bearing of trend of described projection (12) is identical with the width of described main grid line.

3. scraper strip according to claim 1, is characterized in that, described projection (12) protrudes from the height of described blade (11) in the scope of 1 μ m～5 μ m.

4. scraper strip according to claim 1, is characterized in that, described projection (12) along the thickness perpendicular to described blade (11) bearing of trend in the scope of 1 μ m～5 μ m.

5. scraper strip according to claim 1, is characterized in that, the number of described projection (12) is identical with the number of described main grid line.

6. scraper strip according to claim 1, is characterized in that, described projection (12) is rectangular-shaped.

7. scraper strip according to claim 1, is characterized in that, described body (10) comprises many seamed edges, and a seamed edge in described many seamed edges forms described blade (11).

8. scraper strip according to claim 7, is characterized in that, described body (10) is quadrangular shape.