CN216902962U - Front electrode of solar cell and solar cell thereof - Google Patents

Abstract

The utility model discloses a front electrode of a solar cell, which comprises a plurality of fine grids and is characterized in that: arranging a plurality of first structures along the length direction of each thin grid, wherein a plurality of short thin grids are arranged in each first structure, a first end and a second end which are connected with the thin grids are respectively formed at two ends of each first structure, two ends of each short thin grid are respectively positioned at the first end and the second end and are connected with each other, and the middle parts of the adjacent short thin grids are spaced at a set distance; the first structure forms a welding point on the front side of the solar cell. The utility model also discloses another solar cell. The utility model can effectively improve the current transmission path of the solar cell, reduce the broken grid, reduce the shading area of the front surface of the solar cell and improve the short-circuit current of the solar cell.

Description

Front electrode of solar cell and solar cell thereof

Technical Field

The utility model belongs to the technical field of solar energy, and particularly relates to a front electrode of a solar cell and the solar cell.

Background

Solar cells are an important way for people to generate electricity in the future, and solar cells manufactured by adopting crystalline silicon are mainstream technologies in the photovoltaic industry in the coming years. In the prior art, the printing of patterns on the front surface of a mainstream crystalline silicon solar cell basically adopts a printing mode of a secondary grid, a main grid and pad points, and the homogenization is relatively serious. The above structure is not an optimal structure design, and is prone to gate break and power loss. In addition, the front electrode structure has higher welding precision requirement, and the problems of insufficient welding and the like are easily caused in production. For this reason, various attempts and researches have been made to design a front electrode structure of a solar cell, for example, chinese patent application No. 201710554622.2 entitled "a solar cell without a main grid and a photovoltaic module", which discloses a solar cell without a main grid, wherein the front electrode of the solar cell is composed of a plurality of fine grids disposed on the front surface of the substrate, the solar cell further includes a plurality of rows of solder strips for collecting and transmitting current collected by the fine grids, each row of solder strips is connected to the front surface of the substrate through a row of solder points disposed on the front surface of the substrate, and each fine grid is in contact with at least one row of solder strips to conduct electricity; the front electrode of the solar cell improves the transmission path of the surface current of the cell to a certain extent, and can reduce the power loss, but the problem of effective connection between the electrode and a solder strip is not solved, and the problem of insufficient soldering still exists.

SUMMERY OF THE UTILITY MODEL

In view of at least one of the above technical problems, the present invention provides a front electrode of a solar cell, which improves a current transmission path of the solar cell and increases a short-circuit current of the cell.

In another aspect of the present invention, there is also provided a solar cell including the front electrode.

Therefore, the utility model adopts the following technical scheme:

a front electrode of a solar cell comprises a plurality of fine grids, and is characterized in that: arranging a plurality of first structures along the length direction of each thin grid, wherein a plurality of short thin grids are arranged in each first structure, a first end and a second end which are connected with the thin grids are respectively formed at two ends of each first structure, two ends of each short thin grid are respectively positioned at the first end and the second end and are connected, and the middle parts of adjacent short thin grids are spaced at a set distance; the first structure forms a welding spot on the front surface of the solar cell.

Further, the first structural central portion has a dimension greater than the dimensions of the first and second ends thereof.

Further, the first structure is in a diamond shape, a triangular shape, a square shape, a rectangular shape, a circular shape or an oval shape.

Further, the first and second ends of the first structure each form a tip.

Furthermore, 4-20 first structures are arranged on each fine grid at equal intervals.

Furthermore, 2-8 short thin grids are arranged in each first structure.

Furthermore, 2-4 short thin grids are arranged in each first structure.

Furthermore, the first structures on the thin grid lines are arranged in a plurality of rows to form a plurality of first structure rows, and the first structure rows are parallel to each other and are perpendicular to the thin grids.

Furthermore, the plurality of first structure columns are positioned at the position of the original main grid line of the solar cell.

In another aspect of the present invention, there is also provided a solar cell having a front surface electrode as described above.

Compared with the prior art, the front electrode of the solar cell has at least the following advantages:

1. the traditional main grid line is omitted, so that the shielding rate of the front side of the solar cell can be reduced, and the photoelectric conversion efficiency of the solar cell is improved;

2. the traditional main grid line is omitted, so that the use amount of silver paste can be reduced, and the cost is saved;

3. forming a plurality of first structures on each thin grid, wherein a plurality of short thin grids are arranged in each first structure, a first end and a second end which are connected with the thin grids are respectively formed at two ends of each first structure, two ends of each short thin grid are respectively positioned at the first end and the second end, the middle parts of adjacent short thin grids are spaced at a set distance, the first structures form welding spots on the front surface of the solar cell, so that welding spots connected with a welding strip are formed through the first structures, the positions of the welding spots are consistent with the positions of main grid lines of the solar cell of a specific model, and because a plurality of short thin grids are arranged in each welding spot, the power loss caused by grid breakage and grid breakage can be effectively reduced;

4. because each welding spot is internally provided with a plurality of short thin grids, the welding spot is conveniently connected with a welding strip, and the insufficient welding is reduced;

5. a plurality of short and thin grids are arranged in each welding spot, so that the transmission path of the surface current of the solar cell can be improved, and the efficiency of the cell is improved.

In summary, the front electrode of the solar cell provided by the utility model can effectively improve the current transmission path of the solar cell, reduce the broken grid, reduce the shading area of the front of the solar cell, and improve the short-circuit current of the solar cell.

The solar cell provided by the utility model has the advantages.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic structural diagram of a front electrode of a solar cell according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

wherein 1 is a fine grid, 2 is a first structure, 2a is a first end of the first structure, 2b is a second end of the first structure, 3 is a short fine grid, and 4 is a first structure column.

Detailed Description

Example 1:

as shown in fig. 1 and fig. 2, the present embodiment provides a front electrode of a solar cell, which includes a plurality of thin grid lines 1, as a specific implementation manner, the thin grid lines extend along a horizontal direction, as shown in fig. 1 and fig. 2, in order to clearly show the structure of the front electrode, fig. 1 only cuts a part of the front electrode of the solar cell.

A plurality of first structures 2 are arranged along the length direction of each thin grid, a plurality of short thin grids 3 are arranged in each first structure, a first end 2a and a second end 2b connected with the thin grids are respectively formed at two ends of each first structure, two ends of each short thin grid are respectively positioned at the first end 2a and the second end 2b and are respectively connected with the first end 2a and the second end 2b, and the middle parts of adjacent short thin grids are spaced at a set distance; the set distance is determined according to the size of the first structure and the number of the short and thin grates 3, and the set distance is such that the middle parts of the short and thin grates 3 are spaced apart from each other in the first structure, and preferably, the middle parts of the short and thin grates 3 are distributed in the first structure in a substantially equal interval, as shown in fig. 2.

As a specific implementation manner, the size of the middle portion of the first structure is larger than the sizes of the first end and the second end, and in a specific shape, the first structure may be in a plurality of shapes such as a diamond shape, a triangle shape, a square shape, a rectangle shape, a circle shape, or an oval shape. As a preferred embodiment, the first end and the second end of the first structure are respectively formed to be pointed, as shown in fig. 2, the first structure 2 is a diamond shape as a whole, two acute angles of the diamond shape respectively form the first end 2a and the second end 2b of the first structure, 4 short thin grids 3 are arranged in the first structure, and two ends of each short thin grid 3 are respectively arranged at the first end 2a and the second end 2b and are respectively connected with the first end 2a and the second end 2 b. Of course, the number of the short and thin grids 3 can also be adjusted according to the actual application requirements, for example, the number of the grids can be 2, 3, 5, 6, 8, etc.

4-20 first structures are arranged on each fine grid 1 at equal intervals, and as a specific implementation mode, 12 first structures are arranged on each fine grid 1 at equal intervals. Of course, the number of first structures on each fine grid may be determined according to the specific battery type; the first structures on the thin grids 1 are respectively aligned and distributed in rows to form a plurality of first structure rows 4, when 12 first structures are arranged on each thin grid 1 at equal intervals, 12 first structure rows are formed, when 8 first structures are arranged on each thin grid 1 at equal intervals, 8 first structure rows are formed, and the positions of the first structure rows are similar to the positions of the main grid lines of the solar cell, namely: the utility model eliminates the main grid line structure on the front surface of the solar cell, and the first structure is arranged at the position where the main grid line is supposed to be arranged to form the first structure column 4. The first structure columns 4 are parallel to each other and perpendicular to the fine grids 1.

In the utility model, the first structures 2 form welding spots on the front surface of the solar cell and are connected with welding strips; the first structures 2 may also constitute test points for solar cells.

Example 2:

this example provides a solar cell having a front side electrode as described in example 1 on the front side.

Through the test of the applicant, the front electrode of the solar cell provided by the utility model is applied to the solar cell, the efficiency of the cell is equal to that of the existing solar cell, and the silver paste consumption can be saved by 12%; meanwhile, the current transmission path of the cell can be effectively improved, broken grids are reduced, the shading area of the front face of the solar cell is reduced, and the short-circuit current of the solar cell is increased.

In the description of the present invention, "solar cell", "battery", "solar cell" have the same meaning; in the description of the present invention, it should be noted that the terms "vertical", "horizontal", "upper", "lower", "left", "right", "inner", "outer", "side", "width", "height", etc., indicate orientations, directions or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims (10)

1. A front electrode of a solar cell comprises a plurality of fine grids, and is characterized in that: arranging a plurality of first structures along the length direction of each thin grid, wherein a plurality of short thin grids are arranged in each first structure, a first end and a second end which are connected with the thin grids are respectively formed at two ends of each first structure, two ends of each short thin grid are respectively positioned at the first end and the second end and are connected, and the middle parts of adjacent short thin grids are spaced at a set distance; the first structure forms a welding spot on the front surface of the solar cell.

2. The front electrode of a solar cell according to claim 1, characterized in that: the first structural central portion has a dimension greater than a dimension of the first and second ends thereof.

3. The front electrode of a solar cell according to claim 2, characterized in that: the first structure is in a diamond shape, a triangular shape, a square shape, a rectangular shape, a circular shape or an oval shape.

4. The front electrode of a solar cell according to claim 2, characterized in that: the first and second ends of the first structure each form a tip.

5. The front electrode of a solar cell according to claim 1, characterized in that: 4-20 first structures are arranged on each fine grid at equal intervals.

6. The front electrode of a solar cell according to claim 1, characterized in that: each first structure is internally provided with 2-8 short thin grids.

7. The front electrode of a solar cell according to claim 6, characterized in that: each first structure is internally provided with 2-4 short thin grids.

8. The front electrode of a solar cell according to claim 1, characterized in that: the first structures on the thin grid lines are arranged in a plurality of rows to form a plurality of first structure rows, and the first structure rows are parallel to each other and are perpendicular to the thin grid lines.

9. The front electrode of a solar cell according to claim 1, characterized in that: the plurality of first structure columns are positioned at the positions of original main grid lines of the solar cell.

10. A solar cell, characterized by: the front side of the solar cell has a front side electrode according to any of claims 1 to 9.

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