CN203674221U

CN203674221U - MWT cell with novel main gate electrode pattern

Info

Publication number: CN203674221U
Application number: CN201320758616.6U
Authority: CN
Inventors: 徐娟; 罗茂盛
Original assignee: JIANGYIN XINHUI SOLAR ENERGY CO Ltd
Current assignee: JIANGYIN XINHUI SOLAR ENERGY CO Ltd
Priority date: 2013-11-27
Filing date: 2013-11-27
Publication date: 2014-06-25
Anticipated expiration: 2023-11-27

Abstract

The utility model relates to a MWT cell with a novel main gate electrode pattern. The cell comprises a plurality of holes from a front surface to a back surface. The cell is characterized in that the plurality of holes are arranged in an array, a main gate is disposed on the front surface of the cell corresponding to the plurality of vertical holes, and a front electrode of the main gate corresponding to the hole position is in a rhombus shape. Length of a short diagonal of the rhombus is 0.5-3 mm, length of a long diagonal of the rhombus is 3-12 mm, and width of the other parts of the main gate is 0.5-2 mm. Through designing the front electrode on the cell hole position in the rhombus shape, the MWT cell with the novel main gate electrode pattern is advantaged by reducing electrode covering area, reducing consumption of silver paste, increasing illumination receiving area, and reducing optical loss, so that production cost is reduced.

Description

With the MWT battery of Novel main gate electrode figure

Technical field

The utility model relates to a kind of MWT battery, relates in particular to a kind of MWT battery with Novel main gate electrode figure, belongs to solar cell and manufactures field.

Background technology

Solar cell is the semiconductor device that solar energy is converted to electric energy.Battery electrode is the important component part of battery, and it is responsible for the photogenerated current in cell body to cause outside batteries

MWT(Metallization Wrap Through, metal piercing coiling technology) solar cell is compared with conventional solar cell structure, main difference point is that the collected electric current of the emitter of MWT battery surface is by the back side that is directed to battery through the plain conductor of silicon substrate, make its positive and negative electrode all be positioned at the back side of battery, the emission electrode that the conduction main grid line that conventional solar cell front has so is just moved to the back side replaces, such back of the body contact structures have lowered front electrode and have covered the optical loss bringing, and the area of accepting illumination increases relatively.Conventionally use the mode of silk screen printing that conductive silver paste is printed on battery, then pass through high temperature sintering, be used as electrode with this.The figure of battery electrode is with battery total-power loss minimum, designs according to predefined battery parameter value.

The shortcoming of prior art is mainly: existing MWT battery front side electrode figure main grid line area coverage is large, cause the silver slurry of printing to consume high, and shading-area is large, because silver slurry is expensive, causes production cost higher.The object of the invention is to design a kind of novel MWT front electrode figure, reduce electrode coverage long-pending, reduce the consumption of silver slurry, increase illumination receptor area, reduce optical loss, thereby reduce production cost.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provides one to reduce electrode coverage long-pending, reduces the consumption of silver slurry, increases illumination receptor area, reduces optical loss, thereby reduces the MWT battery with Novel main gate electrode figure of production cost.

The purpose of this utility model is achieved in that

A kind of MWT battery with Novel main gate electrode figure, this battery comprises positive multiple punchings to the back side, multiple punching arranged in arrays, vertical battery front side corresponding to multiple punchings is provided with a main grid, the front electrode at the corresponding punching of main grid position is rhombus, long 0.5 ~ the 3mm of rhombus short diagonal, the long 3 ~ 12mm of rhombus long-diagonal, the main grid width of remainder is 0.5 ~ 2mm.

Preferred as one, described main grid is 4.

Compared with prior art, the beneficial effects of the utility model are:

The utility model with the MWT battery of Novel main gate electrode figure by being designed to rhombus at perforating batteries position front electrode, have and adopt that to reduce electrode coverage long-pending, reduce the consumption of silver slurry, increase illumination receptor area, reduce optical loss, thereby reduce the advantage of production cost.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model with the MWT battery of Novel main gate electrode figure.

Fig. 2 is the A place partial enlarged drawing of Fig. 1.

Embodiment

Referring to Fig. 1 and Fig. 2, a kind of MWT battery with Novel main gate electrode figure that the utility model relates to, this battery comprises positive multiple punchings to the back side, multiple punching arranged in arrays, vertical battery front side corresponding to multiple punchings is provided with a main grid, the front electrode at the corresponding punching of main grid position is rhombus, the long 0.5 ~ 3mm of rhombus short diagonal, the long 3 ~ 12mm of rhombus long-diagonal, the main grid width of remainder is 0.5 ~ 2mm, main grid number is not limit, preferred as one, and main grid is 4.

Silicon chip is carried out to laser drilling, making herbs into wool, diffusion, etching, plated film, then use the screen painting of above-mentioned figure, then through high temperature sintering, the isolated battery of making of electrode

The cell piece of this Novel main gate electrode figure is carried out to electric performance test, can reach our test request.Compared with the battery of conventional MWT electrode pattern, assembly merit is damaged indifference.

The more conventional figure MWT of the area coverage battery of this Novel main gate electrode figure has significantly minimizing, positive electrode area coverage reduces 10%, and battery conversion efficiency promotes 0.1%, and the corresponding silver slurry consuming has also reduced respectively 15%, significantly reduce the consumption of silver-colored slurry, saved production cost.Should can be applied to 125 or 156 type silicon chips with the MWT battery of Novel main gate electrode figure.

Embodiment 1

Design the MWT battery with Novel main gate electrode figure described above, take main grid as the battery of 4 is as example, perforating batteries position front electrode is designed to rhombus, the long 1.2mm of rhombus short diagonal, the long 10.29mm of rhombus long-diagonal, all the other position main grid width 1.2mm.By 156 polysilicon chips after laser drilling, making herbs into wool, diffusion, etching, plated film, with this graphic printing silver slurry; Through high temperature sintering, the isolated battery of making of electrode.

Claims

1. the MWT battery with Novel main gate electrode figure, this battery comprises positive multiple punchings to the back side, it is characterized in that multiple punching arranged in arrays, vertical battery front side corresponding to multiple punchings is provided with a main grid, the front electrode at the corresponding punching of main grid position is rhombus, long 0.5 ~ the 3mm of rhombus short diagonal, the long 3 ~ 12mm of rhombus long-diagonal, the main grid width of remainder is 0.5 ~ 2mm.

2. a kind of MWT battery with Novel main gate electrode figure according to claim 1, is characterized in that described main grid is 4.