CN214753789U

CN214753789U - Novel electrode structure of passivation contact battery

Info

Publication number: CN214753789U
Application number: CN202120652615.8U
Authority: CN
Inventors: 王芹芹; 瞿辉; 曹玉甲
Original assignee: Changzhou Shunfeng Solar Energy Technology Co ltd
Current assignee: Changzhou Shunfeng Solar Energy Technology Co ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-11-16
Anticipated expiration: 2031-03-31

Abstract

The utility model belongs to the technical field of solar cell, concretely relates to novel passivation contact cell's electrode structure, including setting up many main grid lines and the thin grid line on the battery, the interval is equipped with a plurality of solder joints on single main grid line is hollow rectangle frame structure, the solder joint shape is triangle-shaped, three edges of triangle-shaped solder joint are equipped with a plurality of bonding wires of guaranteeing to weld tensile respectively. The utility model discloses a novel pattern design, when guaranteeing to reduce silver thick liquid consumption, can promote the efficiency of battery again; is beneficial to the industrialized production of the passivated contact battery.

Description

Novel electrode structure of passivation contact battery

Technical Field

The utility model belongs to the technical field of solar cell, concretely relates to passivation contact solar cell's positive electrode structure.

Background

With the continuous development of the solar energy industry, the pursuit of high-efficiency batteries is a necessary trend. In particular, new passivated contact cells are emerging in the industry as a trend. However, how to ensure high efficiency without increasing the cost, especially, the consumption of the silver paste accounts for more than 50% of the total cost, and the efficiency is ensured while the consumption of the silver paste is reduced.

The screen printing technology is one of the commonly used technologies of the current photovoltaic cell, but the current printed cell pattern is still mostly of the traditional strip solid design, which has the following disadvantages: 1. the design of the fine grid and the main grid line usually adopts a through straight line, and the technical improvement scheme is single; 2. the method for reducing unit consumption commonly used in the industry is achieved by reducing the line width and the number of grid lines, but the method can increase the proportion of poor appearance such as virtual printing, grid breaking and the like to a certain extent, and meanwhile, the battery efficiency can be lost to a certain extent because the current on the surface of a well-collected silicon wafer is not available.

In order to overcome the defects of the conventional electrode patterns, some novel electrode designs are provided, for example, PCT patent No. WO2017/128667, which sets spaced elliptical welding spots on a fine grid line; for example, the name of patent publication No. CN112234109A is a front electrode of a solar cell, in which a main grid line is formed by a thin main grid, a fish-fork thin main grid at the edge of two ends of the thin main grid, and spaced welding points on the thin main grid, and the purpose of the welding points is to reduce silver paste consumption or to improve cell efficiency, but the above-mentioned structure cannot achieve both of them.

Disclosure of Invention

In order to overcome the defects, the utility model aims to provide an electrode structure of a passivation contact battery, which can improve the efficiency of the battery while ensuring the reduction of silver paste consumption through a novel pattern design; is beneficial to the industrialized production of the passivated contact battery.

In order to realize the purpose, the technical scheme of the utility model is that:

the utility model provides a novel electrode structure of passivation contact battery, is including setting up many main grid lines and the thin grid line on the battery, the interval is equipped with a plurality of solder joints on single main grid line, single main grid line is hollow rectangle frame structure, the solder joint shape is triangle-shaped, be equipped with a plurality of bonding wires of guaranteeing the welding pulling force on three limits of triangle-shaped solder joint respectively.

In order to embody the advantages of the scheme, the silver paste consumption is reduced, and meanwhile the efficiency of the battery is guaranteed, the line widths of the four frames of the main grid line are controlled to be 10-30 um.

In order to further effectively reduce the consumption of the slurry, a circular hole is dug in the middle of the triangular welding point.

In order to further effectively reduce the consumption weight of the slurry, the line width of the thin grid line is 10-20 um.

As the utility model discloses a further improvement, under the fine grid line width of reduction prerequisite, in order to guarantee the reliability of connecting, be equipped with a plurality of thin bars connecting wire between adjacent thin grid line, thin bars connecting wire both ends are connected with adjacent thin grid line electricity respectively, and it can prevent effectively that the disconnected bars of thin grid line from causing the electric current collect badly.

In order to ensure the connection reliability, the adjacent thin grid connecting lines are connected end to end and form a triangular structure with the connected thin grid lines.

As the further improvement of the utility model, be equipped with a plurality of branch lines of being connected with thin bars connecting wire electricity on the thin bars connecting wire, the electric current on battery surface can be collected effectively when this design does not increase the unit consumption. The width of the line width of the branched line can be controlled to be 5-10 um.

The utility model discloses carried out the novel design of hollow frame type structure, cooperation triangle-shaped solder joint to the main grid line, carried out the design of thin bars connecting wire, bifurcated line simultaneously to thin grid line, guarantee and improved solar cell's efficiency when it can reduce the thick liquids consumption.

Drawings

Fig. 1 is a diagram of a battery electrode according to the present invention;

fig. 2 is a schematic structural view of a main gate line;

FIG. 3 is a schematic structural diagram of a solder joint on a main gate line;

fig. 4 is a schematic structural view of a thin gate line;

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Example 1: the embodiment relates to a novel electrode pattern design of a passivation contact battery, as shown in fig. 1, a solar battery is printed with a plurality of main grid lines 1 and thin grid lines 2 step by step, the main grid lines 1 are parallel to each other, the thin grid lines 2 are parallel to each other, the main grid lines 1 are perpendicular to the thin grid lines 2, the number of the main grid lines in the embodiment is 12, and the number of the thin grid lines is 150.

As shown in fig. 2, the main gate line 1 is a hollow rectangular frame structure, and 10 solder joints 3 are uniformly spaced thereon. Wherein the length of main grid line rectangle frame is 200mm, and the width is 1mm, and the linewidth width of frame is 20 um.

As shown in fig. 3, the shape of the welding spot 3 on the main grid line is a triangle, preferably an equilateral isosceles triangle structure; in the embodiment, the welding spot 3 is in an equilateral triangle structure, and the side length of the welding spot is 2 mm. A circular hole 32 is dug in the center of the triangular welding point, so that the consumption of the slurry is effectively reduced, and the radius of the circular hole 32 is 0.4 mm; the whole triangle except the round hole is of a solid structure. In order to ensure that the uniform tension is greater than 1N, a plurality of bonding wires 31 are respectively arranged on three sides of the triangular welding point, preferably, each side is greater than 6, the length of each bonding wire 31 can be different from 0.1-0.4mm, and the line width is designed to be 15um in the embodiment.

As shown in fig. 4: the length of the thin grid line 2 is 180mm, and the width of the line width is 16 um. A plurality of thin grid connecting lines 4 are arranged between adjacent thin grid lines, the thin grid connecting lines 4 in the same region are connected end to end, and two ends of each thin grid connecting line 4 are respectively connected with the adjacent thin grid lines 2; in this embodiment, the line width of the thin gate connecting line 4 is 6um, and the design of the thin gate connecting line 4 can effectively prevent poor current collection caused by broken gates of the thin gate line. In this embodiment, each thin grid connecting line is provided with a plurality of branched lines 41 electrically connected with the thin grid connecting lines, the length of the branched lines 41 is controlled to be 0.1-0.5mm, and the line width is 5 um.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a novel electrode structure of passivation contact battery, is including setting up many main grid lines and the thin grid line on the battery, the interval is equipped with a plurality of solder joints on the main grid line, its characterized in that: the main grid line is of a hollow rectangular frame structure, the welding spot is triangular, and three sides of the triangular welding spot are respectively provided with a plurality of welding wires for ensuring welding tension.

2. An electrode structure for a passivated contact battery according to claim 1 wherein: the line widths of the four frames of the main grid line are 10-30 um.

3. An electrode structure for a passivated contact battery according to claim 1 or 2 wherein: and a round hole is dug in the middle of the triangular welding point.

4. An electrode structure for a passivated contact battery according to claim 1 wherein: the line width of the thin grid line is 10-20 um.

5. An electrode structure for a passivated contact battery according to claim 4 wherein: and a plurality of thin grid connecting wires are arranged between the adjacent thin grid lines, and two ends of each thin grid connecting wire are respectively and electrically connected with the adjacent thin grid lines.

6. An electrode structure for a passivated contact battery according to claim 5 wherein: and the adjacent thin grid connecting lines are connected end to end and form a triangular structure with the connected thin grid lines.

7. An electrode structure for a passivated contact battery according to claim 5 wherein: and the thin grid connecting wire is provided with a plurality of branched wires electrically connected with the thin grid connecting wire.