CN210337234U

CN210337234U - Printing table top for preparing MWT battery

Info

Publication number: CN210337234U
Application number: CN201920419134.5U
Authority: CN
Inventors: 黄智�; 徐涛; 王波; 李质磊; 吴仕梁; 张凤鸣
Original assignee: Wuxi Rituo Photovoltaic Technology Co ltd
Current assignee: Wuxi Rituo Photovoltaic Technology Co ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-04-17
Anticipated expiration: 2029-03-29

Abstract

The utility model provides a printing table board for preparing MWT battery, the printing table board comprises a table board panel, a hollowed-out groove is arranged on the table board panel and corresponds to the position of the MWT battery needing laser drilling, vacuum air holes are distributed around the hollowed-out groove, and the aperture of the vacuum air holes is smaller than that of the hollowed-out groove; a table top gas circuit is arranged below the table top panel and communicated with each vacuum air hole; based on the utility model provides a printing table face, the laser hole department of MWT battery corresponds the position at the mesa and is the fretwork design, has solved the problem of MWT battery hole plugged hole printing.

Description

Printing table top for preparing MWT battery

Technical Field

The invention relates to the technical field of silicon solar cell processes, in particular to a design of raw auxiliary materials or consumables of an MWT silicon solar cell manufacturing process.

Background

Currently, the crystalline silicon solar technology includes a heterojunction solar cell HIT, a back electrode contact silicon solar cell IBC, an emitter surrounding punch-through silicon solar cell EWT, a laser grooving buried gate cell, an inclined evaporation metal contact silicon solar cell OECO, a metal through-hole winding silicon solar cell MWT, and the like. Among them, MWT batteries are receiving more and more attention because of their high efficiency, small shading area and better appearance.

The MWT silicon solar cell transfers current carriers collected by the grid lines on the front side to the back side of the cell through laser drilling, so that the purpose of improving the conversion efficiency is achieved by reducing the shading area. Therefore, in order to realize the MWT battery structure, two functions of punching and hole conduction are required to be added in the conventional battery structure. Wherein, the perforation is usually realized by adopting a laser perforation mode at present; the hole conduction is usually realized by screen printing hole filling slurry and then co-sintering with the front electrode and the aluminum back surface field. For example, patent CN201410016190.6 provides a low-cost MWT battery preparation method, which only adds two processes to the traditional crystalline silicon battery production process to realize the MWT battery structure, and because the method has simple process and less equipment production, the method becomes the only mass production process of MWT batteries in the industry at present. In screen printing equipment, one of the most important key parts is the printing table used for carrying the silicon wafer. Because the MWT battery has more holes, and the hole conduction is realized by adopting a screen printing hole filling slurry and a co-sintering mode, the design of the printing table top has great influence on the hole plugging state of the MWT holes, and is very important.

The Micro-Tec printer is one of the photovoltaic screen printing printers, developed by japan. The printing table top of the screen printing machine consists of a printing panel (shown in figure 1) and a table top air passage (shown in figure 2), and the silicon wafer is absorbed by the silicon wafer through the air holes (shown in figure 1) on the table top to meet the printing requirement of screen printing. Because the table surface only absorbs vacuum and the air holes are not uniformly distributed, the requirements of hole blocking and printing of MWT laser holes cannot be directly met.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the novel printing table for preparing the MWT battery is provided, and the laser hole of the MWT battery is hollowed out at the corresponding position of the table, so that the problem of hole blocking printing of the MWT battery hole is solved.

The utility model provides a technical scheme as follows: a printing table top for preparing an MWT battery comprises a table top panel, wherein a hollowed-out groove is formed in the position, corresponding to the position of the MWT battery needing laser drilling, on the table top panel, vacuum air holes are distributed around the hollowed-out groove, and the aperture of each vacuum air hole is smaller than that of the hollowed-out groove;

a table top gas circuit is arranged below the table top panel and communicated with each vacuum air hole.

Furthermore, the hollowed-out groove is circular or polygonal, the area of the hollowed-out groove is larger than that of the laser hole, the inner diameter of the hollowed-out groove is 1-10mm, and the depth of the hollowed-out groove is 0.5-5 mm.

Furthermore, the shape of the vacuum air hole is circular or polygonal, and the inner diameter is 0.1-5 mm.

Further, the printing table top is an improvement on the printing table top of a Micro-Tec printer.

Preferably, the hollowed-out grooves are arranged according to a 6 x 6 specification, the vacuum air holes are located outside the hollowed-out grooves, and four vertexes of a rectangle formed by taking the hollowed-out grooves as the center are uniformly distributed on the whole printing table top.

The utility model discloses following beneficial effect has:

1. at the laser hole, the table top adopts a hollow design, so that the basic requirements of hole plugging printing of MWT battery holes are met;

2. a plurality of vacuum air holes are uniformly designed around the hollow air hole of each laser hole, and the whole printing table top is uniformly distributed in a vacuum mode.

Drawings

FIG. 1 is a schematic diagram of a prior art countertop panel;

FIG. 2 is a schematic diagram of a prior art mesa gas circuit;

FIG. 3 is a schematic diagram of the distribution of laser holes of an MWT cell sheet;

fig. 4 is a schematic structural diagram of a table panel provided by the present invention;

fig. 5 is a side view of a printing table provided by the present invention;

wherein: 1-vacuum air holes, 2-hollow grooves and 3-table-board air channels.

Detailed Description

The technical solution of the present invention will now be fully described with reference to the accompanying drawings. The following description is merely exemplary of some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present invention.

Example 1

The utility model provides a printing table board for preparing MWT battery, the printing table board comprises a table board panel, a hollowed-out groove 2 is arranged on the table board panel and corresponds to the position of the MWT battery needing laser drilling, vacuum air holes 1 are distributed around the hollowed-out groove 2, and the aperture of the vacuum air hole 1 is smaller than that of the hollowed-out groove 2; a table-board air passage 3 is arranged below the table-board panel, and the table-board air passage 3 is communicated with each vacuum air hole 1.

Furthermore, the shape of the hollowed-out groove 2 provided by the utility model can be circular or polygonal, the area of the hollowed-out groove is larger than that of the laser hole, the inner diameter is 1-10mm, and the depth is 0.5-5 mm. The vacuum air hole 1 is circular or polygonal in shape, and the inner diameter is 0.1-5 mm.

Circular grooves of 5mm diameter and 5mm depth were designed, arranged 6 x 6 and in line with the 6 x 6 laser-drilled pattern of the MWT cells as shown in figure 3.

As shown in fig. 4 and 5, the vacuum holes 1 are located outside the hollow grooves 2, and four vertexes of a rectangle formed by centering on the hollow grooves 2, specifically, 4 circular vacuum holes 1 are set around the grooves, the circular vacuum holes being uniformly distributed and having a diameter of 1 mm. The vacuum vents 1 are divided into 12 rows of 12 holes each. Each row of vacuum holes is connected with a circular horizontal part with the diameter of 4mm through a vertical part with the depth of 3mm, and the horizontal parts are connected with a table-board air passage 3 through 1-5 circular total connecting parts with the diameter of 5mm to form vacuum transmission. Preferably, the hollowed-out grooves 2 are arranged according to a 6 × 6 specification and are uniformly distributed on the whole printing table.

The utility model provides a printing table top, at the laser hole, the table top adopts the fretwork design, has satisfied the basic requirement of MWT battery hole plug hole printing; a plurality of vacuum air holes 1 are uniformly designed around the hollow air hole of each laser hole, and the whole printing table top is uniformly distributed in vacuum.

The above embodiments are provided only for the purpose of illustration, and not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, all belong to the scope of the present invention.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims, specification and equivalents thereof.

Claims

1. A printing table top for preparing an MWT battery is characterized by comprising a table top panel, wherein a hollowed-out groove is formed in the position, corresponding to the position of the MWT battery needing laser drilling, of the table top panel, vacuum air holes are distributed around the hollowed-out groove, and the aperture of each vacuum air hole is smaller than that of the hollowed-out groove;

2. The printing table top for preparing MWT battery as claimed in claim 1, wherein the hollowed-out groove is circular or polygonal in shape, has an area larger than that of the laser hole, and has an inner diameter of 1-10mm and a depth of 0.5-5 mm.

3. The printing table-top for the preparation of MWT cells according to claim 1, characterized in that the vacuum vents are circular or polygonal in shape and have an internal diameter of 0.1-5 mm.

4. A printing table for the production of MWT cells according to any of claims 1 to 3, characterized by the improvement made to the printing table of a Micro-Tec printer.

5. The printing table for manufacturing MWT battery as claimed in claim 4, wherein the hollowed-out grooves are arranged according to 6 x 6 specification, the vacuum air holes are located outside the hollowed-out grooves, and the four vertexes of the rectangle formed by taking the hollowed-out grooves as the center are evenly distributed on the whole printing table.