CN203901917U

CN203901917U - Front electrode printing steel plate of solar cell

Info

Publication number: CN203901917U
Application number: CN201320887977.0U
Authority: CN
Inventors: 杨建国; 周莹; 殷国安; 张大雨; 王春燕; 田娜; 杨雄磊
Original assignee: Juli New Energy Co Ltd
Current assignee: Juli New Energy Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2014-10-29
Anticipated expiration: 2023-12-31

Abstract

The utility model discloses a front electrode printing steel plate of a solar cell. The front electrode printing steel plate is a thin stainless steel plate in uniform thickness, and the thin stainless steel plate is provided with even-width micro holes of which the number, the length and the width are the same as those of thin grid lines of a front electrode of the solar cell manufactured through an etching or cutting technology. According to the front electrode printing steel plate disclosed by the utility model, the height of the thin grid lines of the front electrode, which is printed by adopting the front electrode printing steel plate, of the solar cell is uniform, the problem of forming peaks and valleys does not exist any more, thus series resistors are reduced, and the cell conversion efficiency is increased; the printing life of the front electrode printing steel plate can be up to 60,000 times, the service life of the front electrode printing steel plate is long, and the production cost of the solar cell is reduced to a large extent.

Description

A kind of front electrode of solar battery printing steel version

Technical field

The utility model relates to a kind of front electrode printing equipment of solar cell, particularly the thin grid line printing of a kind of front electrode steel version.

Background technology

Serigraphy is to make at present the most general a kind of production technology of solar cel electrode.Serigraphy be adopt the mode of impression by predetermined graphic printing on substrate, its operation principle is: utilize silk screen visuals mesh to see through slurry, apply certain pressure with scraper at the slurry position of silk screen, the while moves towards the silk screen other end.Slurry is expressed on substrate from the mesh of visuals by scraper in movement.Because the viscous effect of slurry makes trace set within the specific limits, printing middle scraper is linear with screen printing forme and substrate all the time and contact, and contact wire moves with scraper and movement, thereby completes print stroke.

Printing screen plate uses nylon/steel wire composite webs method for platemaking conventionally at present, taking nylon mesh as supporter, by screen tension on screen frame, then at online coating photoresists, form light sensitive plate film, again by closely sealed positive image negative printing down on version film, through exposure imaging, on forme, do not need the part of China ink to be subject to light to form cured plate film, mesh was sealed, strike through not when printing, on forme, needed the mesh of the part of China ink not seal, when printing, ink sees through, and forms slurry trace, as depicted in figs. 1 and 2 on stock.

This kind of composite halftone is to be formed by silk thread braiding, netting twine has intersection tubercle, this part can hinder strike through in printing process, cause grid line height height to rise and fall, especially the wide thin grid line of 30-80 μ m is comparatively obvious, occurs " peak ", " paddy " otherness, namely the height of thin grid line is inhomogeneous, increase electrode resistance, and then increased series resistance, affected battery conversion efficiency.In addition, in printing process, scraper makes half tone tension force with changing service time to the pressure-acting of half tone, and the screen painting life-span is only 10,000 left and right.

Summary of the invention

The purpose of this utility model solves the above-mentioned problems in the prior art exactly, a kind of front electrode of solar battery printing steel version is provided, the thin grid line height of the battery front side electrode of this printing steel version printing is even, no longer form the problem at " peak " and " paddy ", thereby reduce series resistance, improved battery conversion efficiency.

For completing above-mentioned purpose, technical solution of the present utility model is: a kind of front electrode of solar battery printing steel version, it is the uniform stainless sheet steel of thickness, on stainless sheet steel by etching or cutting technique have identical with the thin grid line number of the front electrode of solar battery of made, length and width are identical, the uniform micropore of width.

The thin grid line height of the battery front side electrode of employing the utility model printing is even, no longer forms the problem at " peak " and " paddy ", thereby has reduced series resistance, has improved battery conversion efficiency.The utility model printing can reach 60,000 times in the life-span, and long service life of the present utility model has significantly reduced the production cost of solar cell.

Contrast effect experiment:

Experiment 1: existing nylon/steel wire composite halftone printing, the substrate that prints backplate and electric field is placed under existing composite halftone and is printed, meshcount is 400, thickness 15 μ m, the thick 28 μ m of yarn, string diameter 18 μ m, thin grid line radical is 80, thin grid line width 50 μ m; Positive electrode main grid line and thin grid line one-step print moulding, after the printing of battery positive electrode, figure and the utility model printing steel version positive electrode are consistent.As shown in Figure 5 and Figure 6, thin grid line height is inhomogeneous for its thin grid line microstructure, forms the problem at " peak " and " paddy ".

Cell piece batch production data are as follows:

Experiment 2: with the printing of the utility model steel version, first the substrate that prints backplate and electric field is carried out to the printing of front electrode main grid line, this main grid gauze version is conventional composite halftone, after oven dry, substrate is placed in and under the utility model steel version, carries out thin grid line printing, the printing of steel version is used special scraper, steel version thickness 46 μ m, and thin grid line radical is 80, thin grid line width 50 μ m, as shown in Figure 7, thin grid line height is even for its thin grid line microstructure, no longer forms the problem at " peak " and " paddy ".

Cell piece batch production data are as follows:

Quantity	Uoc	Isc	Rs	Rsh	FF	NCell
							8905	0.627	8.630	0.0022	638.583	78.31	17.41

Can be found out by above experiment, use the utility model steel version printed battery positive electrode reduction series resistance, the series resistance decline 0.002m Ω left and right of solar cell, batch production battery average conversion efficiency has reached more than 17.4%, average efficiency improves 0.2-0.3% on year-on-year basis, the steel version life-span can reach 60,000 times, long service life of the present utility model, thus reduce printing cost.

Brief description of the drawings

Fig. 1 is conventional composite halftone overall structure figure;

Fig. 2 is the A portion enlarged drawing of Fig. 1;

Fig. 3 is overall structure figure of the present utility model;

Fig. 4 is the B portion enlarged drawing of Fig. 3;

Fig. 5 is the 3D microscope picture of the thin grid line of conventional screen painting, the cross section of thin grid line protuberance, i.e. " peak ", height 45 μ m left and right;

Fig. 6 is the 3D microscope picture of the thin grid line of conventional screen painting, the cross section of thin grid line depression, i.e. " paddy ", height 26 μ m left and right;

Fig. 7 is the 3D microscope picture of the thin grid of the utility model steel version printing, and grid line is evenly level and smooth, is highly 34 μ m left and right.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model will be further described with concrete embodiment.

As depicted in figs. 1 and 2, the present embodiment front electrode of solar battery printing steel version is the uniform stainless sheet steel 1 of thickness, on stainless sheet steel 1 by etching or cutting technique have identical with the thin grid line number of the front electrode of solar battery of made, length and width are identical, the uniform micropore 2 of width.

Claims

1. a front electrode of solar battery printing steel version, it is characterized in that: it is for the uniform stainless sheet steel of thickness, on stainless sheet steel by etching or cutting technique have identical with the thin grid line number of the front electrode of solar battery of made, length and width are identical, the uniform micropore of width.