CN219180522U

CN219180522U - Copper grid line electrode and solar cell

Info

Publication number: CN219180522U
Application number: CN202223327250.5U
Authority: CN
Inventors: 田宏波; 黎力; 李洋; 王伟; 李世岚
Original assignee: State Power Investment Group New Energy Technology Co ltd
Current assignee: State Power Investment Group New Energy Technology Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-06-13
Anticipated expiration: 2032-12-12

Abstract

The utility model relates to a copper grid line electrode, which comprises a plurality of main grid lines and thin grid lines which are arranged at intervals, wherein the main grid lines and the thin grid lines are all wavy, the main grid lines are arranged at intervals along a first direction, the first direction is parallel to the width direction of the main grid lines, the thin grid lines are arranged at intervals along a second direction, the second direction is parallel to the length direction of the main grid lines, and the main grid lines are made of metal copper with tin plated on the outer surface.

Description

Copper grid line electrode and solar cell

Technical Field

The utility model relates to the technical field of silicon heterojunction solar cells, in particular to a copper grid line electrode and a solar cell.

Background

The grid line of the solar cell plays a role in collecting and guiding out current, and the wider and denser the grid line is, the lower the resistance loss is from the aspect of conductivity; however, the shielding effect of the metal grid line on the incident light is an important cause of current loss for the front surface of the battery, so the core of the design of the battery grid line pattern is how to balance the light shielding loss and the conductivity.

In order to improve the conversion efficiency of the battery, the number of solar battery main grids is subjected to processes from 2 to 3 to 5 and even more than ten as the size of a silicon wafer is increased in the last years, and the current hotter multi-main grid technology is developed.

At present, in a conventional grid line battery, no matter electrode routes of a 5 main grid, a 9 main grid or a plurality of main grids, the main grids are all straight lines which are parallel to each other and have lengths close to the side length of a silicon wafer, the high-efficiency battery requires the main grid line to have higher aspect ratio, when the aspect ratio of the conventional linear main grid is improved, the width of the main grid line is narrow, the width of the main grid line is between 0.1 and 0.3mm, when welding equipment welds a welding strip on the upper surface of the main grid line, the welding strip and the main grid line are required to be accurately aligned due to the fact that the width of the welding strip is narrow, welding positions are easy to misplacement, and when the welding strip is subjected to position deviation in the width direction of the main grid line, the condition that the welding strip is not welded on the main grid line is easy to occur.

Disclosure of Invention

The utility model provides a copper grid line electrode and a solar cell, and aims to solve the problem that a welding strip in the background technology is not welded on a grid line.

In order to achieve the above object, according to a first aspect of the present utility model, there is provided a copper gate line electrode, including a plurality of main gate lines and thin gate lines arranged at intervals, the main gate lines and the thin gate lines each having a wave shape, the main gate lines being arranged at intervals along a first direction parallel to a width direction of the main gate lines, the thin gate lines being arranged at intervals along a second direction parallel to a length direction of the main gate lines, the main gate lines being made of metallic copper whose outer surfaces are tin-plated.

The main grid line comprises a plurality of first arc line segments and second arc line segments, two ends of the first arc line segments are respectively connected with the second arc line segments, two ends of the second arc line segments are respectively connected with the first arc line segments, and the first arc line segments and the second arc line segments are connected to form an S-shaped structure.

The further scheme is that the arc radius of the first arc line section and the second arc line section is 1 mm-3 mm.

In a further scheme, a plurality of bonding pad points are arranged on the main grid line, and the bonding pad points are arranged at intervals along the second direction.

The further scheme is that the welding plate point is rectangular, elliptical or irregularly shaped, the size of the welding plate point in the length direction of the thin grid line is in the range of 0.5mm-3.0mm, and the size of the welding plate point in the length direction of the main grid line is in the range of 0.1mm-2.0mm.

The number of the main grid lines is 5, 9 or 12.

The further scheme is that the distance difference between the wave crest and the wave trough of the wavy curve of the main grid line is 0.1mm-2.7mm.

According to a second aspect of the present utility model there is provided a solar cell comprising a copper grid line electrode as described above.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the main grid line is arranged in a wave shape, so that the coverage range of a single main grid line in the width direction of the main grid line is increased, when the height-width ratio of the main grid line is increased, even if the position deviation between the central line of the welding strip and the central line of the main grid line is larger in the welding process, the welding strip can be welded on the main grid line, so that the probability that the main grid line and the welding strip are not effectively welded is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a gate line electrode of a solar cell according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a partial enlarged structure at A in FIG. 1;

reference numerals: a main gate line 100, a thin gate line 200, a pad point 300, a first arc-shaped section 101, and a second arc-shaped section 102.

Detailed Description

In order that the objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-2, a copper gate electrode includes a plurality of main gate lines 100 and thin gate lines 200 arranged at intervals, wherein the main gate lines 100 and the thin gate lines 200 are all in a wave shape, the thin gate lines 200 are arranged at intervals along a second direction, the second direction is parallel to the length direction of the main gate lines 100, and the second direction is the up-down direction in fig. 1. The main gate lines 100 are arranged at intervals along a first direction, which is parallel to the width direction of the main gate lines 100, i.e., the left-right direction in fig. 1. The plurality of main gate lines 100 and the plurality of thin gate lines 200 cross each other in a mesh structure.

The main grid line 100 comprises a plurality of first arc line segments 101 and second arc line segments 102, two ends of the first arc line segments 101 are respectively connected with the second arc line segments 102 in a smooth transition mode, two ends of the second arc line segments 102 are respectively connected with the first arc line segments 101 in a smooth transition mode, circle centers of the first arc line segments 101 and the second arc line segments 102 are respectively located at two sides of the main grid line 100, the first arc line segments 101 and the second arc line segments 102 are in an S-shaped structure, it can be understood that the coverage area of a single main grid line 100 in the width direction of the main grid line 100 is increased, when the height-width ratio of the main grid line 100 is increased, a welding strip can be welded on the main grid line 100 even if the position deviation between the center line of the welding strip and the center line of the main grid line 100 is large in the welding process, and therefore the probability that the main grid line 100 and the welding strip are not effectively welded is reduced.

The width of any point on the main grid line 100 is 0.1-0.3 mm, the number of the main grid lines 100 is 5 or 9 or 12, and the arc radiuses of the first arc line segment 101 and the second arc line segment 102 are 1-3 mm. The material of the main gate line 100 is metallic copper with an outer surface plated with tin.

Here, the width of any point on the main gate line 100 refers to the dimension in the normal direction of any point on the arc line segment of the main gate line 100.

In some embodiments, a plurality of pad points 300 are disposed on the main gate line 100, and a plurality of pad points 300 are disposed on the main gate line 100 at intervals along the second direction.

The pad points 300 are rectangular, oval or irregular, the size of the pad points 300 in the length direction of the thin grid line 200 is 0.5mm-3.0mm, and the size of the pad points 300 in the length direction of the main grid line 100 is 0.1mm-2.0mm, and it is understood that the size of the pad points 300 in the width direction of the main grid line 100 is larger than the width of the main grid line 100, so that the solder strips are easy to be welded on the pad points 300, the effective connection of the solder strips and the main grid line 100 can be realized through the pad points 300, and the probability that the main grid line 100 and the solder strips are not effectively welded is further reduced.

The solar cell according to the embodiment of the utility model comprises the copper grid line electrode of the solar cell according to any embodiment. The solar cell can be a silicon heterojunction solar cell or other types of solar cells.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application for the embodiment. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A copper gate line electrode, characterized by: including main grid line (100) and thin grid line (200) that a plurality of intervals set up, main grid line (100) and thin grid line (200) all are the wave, main grid line (100) are along first direction interval setting, first direction is on a parallel with the width direction of main grid line (100), thin grid line (200) are along second direction interval setting, the second direction is on a parallel with the length direction of main grid line (100), and the material of main grid line (100) is the metallic copper of surface tin-plating.

2. A copper gate line electrode according to claim 1, wherein: the main grid line (100) comprises a plurality of first arc line segments (101) and second arc line segments (102), two ends of each first arc line segment (101) are respectively connected with the corresponding second arc line segment (102), two ends of each second arc line segment (102) are respectively connected with the corresponding first arc line segment (101), and the first arc line segments (101) and the corresponding second arc line segments (102) are connected to form an S-shaped structure.

3. A copper gate line electrode according to claim 2, wherein: the arc radiuses of the first arc line segment (101) and the second arc line segment (102) are 1 mm-3 mm.

4. A copper gate line electrode according to claim 1, wherein: and a plurality of pad points (300) are arranged on the main grid line (100), and the pad points (300) are arranged at intervals along the second direction.

5. A copper gate line electrode according to claim 4, wherein: the bonding pad points (300) are rectangular, elliptical or irregular, the size of the bonding pad points (300) is 0.5mm-3.0mm in the length direction of the thin grid line (200), and the size of the bonding pad points is 0.1mm-2.0mm in the length direction of the main grid line (100).

6. A copper gate line electrode according to claim 1, wherein: the number of the main grid lines (100) is 5, 9 or 12.

7. A copper gate line electrode according to claim 1, wherein: the distance difference between the wave crest and the wave trough of the wavy curve of the main grid line (100) is 0.1mm-2.7mm.

8. A solar cell, characterized in that: a copper gate line electrode comprising any one of claims 1 to 7.