CN211428180U

CN211428180U - Solar cell grid line printing screen and solar cell

Info

Publication number: CN211428180U
Application number: CN201922444805.6U
Authority: CN
Inventors: 方贵允; 吴含封; 徐加喜; 李家兰
Original assignee: Dongguan Csg Photovoltaic Technology Co ltd
Current assignee: Dongguan Csg Photovoltaic Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-09-04
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a solar cell grid line printing half tone and solar cell. The solar cell grid line printing half tone includes: the grid lines extend along the row direction and are arranged in a plurality of rows, and the grid lines are arranged in parallel; a plurality of secondary grid lines extending along the row direction and arranged in a plurality of rows, wherein the row direction is vertical to the column direction, and the secondary grid lines connect the adjacent main grid lines; the auxiliary guide lines are arranged between the adjacent auxiliary grid lines in the row direction and connect the adjacent auxiliary grid lines; and the positions of all the auxiliary guide lines connected with the two sides of each auxiliary grid line in the row direction are staggered. The utility model discloses can form more photoelectric current path to reduce solar cell's series resistance, promote short-circuit current, improve solar cell's photoelectric conversion efficiency. And EL bad caused by printing missing of the grid lines/auxiliary guide lines can be reduced, and the production yield is improved.

Description

Solar cell grid line printing screen and solar cell

Technical Field

The utility model relates to a screen printing especially relates to a solar cell grid line printing half tone, still relates to a solar cell.

Background

The power generation principle of the solar cell is that a photovoltaic effect is utilized, a potential difference is formed at a PN junction, a built-in electric field is established, but voltage exists, a current stroke does not exist, the electric energy needs to be conducted out through a wire, and a grid line is a first-stage wire for bearing current. The solar cell grid line printing screen printing grid line has the functions of collecting and conducting charges, reducing power loss caused by electrode resistance and improving conversion efficiency of the solar cell.

The grid line is one of the important factors affecting the photoelectric conversion efficiency of the solar cell and the lifetime of the module. When grid lines on the surface of the solar cell are designed, in order to collect photocurrent to a main grid to the maximum extent, if the grid breakage phenomenon of metal thin grid lines occurs in the electrode printing process, the circuit is broken, the series resistance of the cell is increased, the short-circuit current is reduced, and the photoelectric conversion efficiency of the cell is affected. The defect of the metal fine grid line can also cause the generation of defective EL (electroluminescence) grid breaking products, and the yield of enterprise production is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a solar cell grid line printing screen and a solar cell.

A solar cell grid line printing half tone, includes: the grid lines extend along the row direction and are arranged in a plurality of rows, and the grid lines are arranged in parallel; a plurality of secondary grid lines extending along the row direction and arranged in a plurality of rows, wherein the row direction is vertical to the column direction, and the secondary grid lines connect the adjacent main grid lines; the auxiliary guide lines are arranged between the adjacent auxiliary grid lines in the row direction and connect the adjacent auxiliary grid lines; and the positions of all the auxiliary guide lines connected with the two sides of each auxiliary grid line in the row direction are staggered.

In one embodiment, each of the auxiliary guide flow lines extends in the column direction.

In one embodiment, the auxiliary guide lines are arranged in parallel with each other.

In one embodiment, for each auxiliary guide line connected to two opposite sides of two adjacent sub-gate lines in the column direction, the positions of each auxiliary guide line connected to one sub-gate line in the row direction are the same as the positions of each auxiliary guide line connected to another sub-gate line in the row direction in a one-to-one correspondence manner, so that a repeating unit in the column direction is formed between the adjacent main gate lines.

In one embodiment, for the sub-grid lines with the auxiliary guide lines connected to both sides, the number of the auxiliary guide lines connected to the first side is 1, and the sub-grid lines are located on the center lines of two adjacent main grid lines, and the number of the auxiliary guide lines connected to the second side is 2, and the sub-grid lines are located at the positions that the distance between the two adjacent main grid lines is quartered.

In one embodiment, each of the main gate lines is thicker than each of the sub gate lines.

In one embodiment, each of the main gate lines is thicker than each of the auxiliary guide lines.

In one embodiment, the liquid crystal display panel further comprises a fixed wire frame, and each main grid line, each auxiliary grid line and each auxiliary guide line are arranged in the fixed wire frame.

In one embodiment, the solar cell grid line printing screen is a front electrode grid line printing screen for printing a front electrode of a solar cell.

A solar cell, comprising: a silicon substrate formed with a PN junction; the front electrode is arranged on the first surface of the silicon substrate and comprises a metal grid line; the metal grid line is formed by printing the solar cell grid line printing screen printing plate according to any one of the embodiments.

According to the solar cell grid line printing screen and the solar cell, besides the main grid lines in the row direction and the auxiliary grid lines in the row direction, the auxiliary guide lines are arranged to connect the adjacent auxiliary grid lines, and the auxiliary guide lines connected with each auxiliary grid line are staggered with each other, so that more photoelectric circulation paths can be formed, the series resistance of the solar cell is reduced, the short-circuit current is improved, and the photoelectric conversion efficiency of the solar cell is improved. Even if a certain number of grid lines/auxiliary guide lines are printed and lost, the photocurrent can be conducted through other intact current paths, so that poor EL caused by the printing and missing of the grid lines/auxiliary guide lines can be reduced, and the production yield is improved.

Drawings

FIG. 1 is a grid line structure diagram of an exemplary solar cell grid line printing screen;

fig. 2 is a grid line structure diagram of a solar cell grid line printing screen according to an embodiment of the present application;

fig. 3 is a partially enlarged view of the structure shown in fig. 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that when an element is referred to as being "secured 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only. When an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it can be directly on, adjacent to, connected or coupled to the other elements or layers or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly adjacent to," "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.

When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Fig. 1 is a grid line structure diagram of an exemplary solar cell grid line printing screen. When the solar cell grid line printing screen is used for printing the solar cell grid line, if grid line printing is lost, the problems of increase of series resistance of the cell and reduction of short-circuit current easily occur, and the conversion efficiency of the cell is influenced. The grid line loss can also lead to the production of EL broken grid defective products, and the yield of enterprise production is influenced.

Fig. 2 is a structure diagram of a grid line of a solar cell grid line printing screen according to an embodiment of the present application, and fig. 3 is a partially enlarged view of the structure shown in fig. 2, and the following describes the structure of the grid line of the solar cell grid line printing screen in detail with reference to the accompanying drawings.

The gate line structure includes a plurality of main gate lines 10, a plurality of sub-gate lines 20, and a plurality of auxiliary guide lines 30, and fig. 2 shows the structure between two adjacent main gate lines 10. The bus bars 10 extend in a column direction (i.e., a longitudinal direction in fig. 2 and 3) and are arranged in a plurality of columns, and the bus bars 10 are arranged in parallel with each other. Each of the finger lines 20 extends in a row direction (i.e., a transverse direction in fig. 2 and 3) to be arranged in a plurality of rows, and the finger lines 20 connect adjacent main finger lines 10. Each auxiliary guide line 30 is provided between adjacent (adjacent in the column direction) finger lines 20, and connects the respective adjacent finger lines 20. The positions of all the auxiliary guide lines 30 connected to both sides (both sides in the column direction) of each finger line 20 in the row direction are staggered from each other.

Above-mentioned solar cell grid line printing half tone and solar cell, except the main grid line 10 of direction of row and the vice grid line 20 of line direction, still set up supplementary water conservancy diversion line 30 and connect each adjacent vice grid line 20, and the supplementary water conservancy diversion line 30 that every vice grid line 20 is connected all staggers each other, consequently can form more photocurrent route, collect the electric current for the battery piece and provide more water conservancy diversion route, thereby reduce solar cell's series resistance (reduce the transverse resistance between the grid line), promote short-circuit current and collect the electric current, improve solar cell's photoelectric conversion efficiency. Even if a certain number of grid lines/auxiliary guide lines are printed and lost, the photocurrent can be conducted through other intact current paths, so that poor EL caused by the printing and missing of the grid lines/auxiliary guide lines can be reduced, and the production yield is improved.

In the embodiment shown in fig. 2 and 3, the auxiliary guide flow lines 30 extend in the column direction, and the auxiliary guide flow lines 30 are arranged parallel to each other.

In the embodiment shown in fig. 2 and 3, for each auxiliary guide line 30 connected to two opposite sides of two adjacent sub-gate lines 20 in the column direction, the positions of each auxiliary guide line 30 connected to one sub-gate line 20 in the row direction are the same as the positions of each auxiliary guide line 30 connected to another sub-gate line 20 in the row direction, so that a repeating unit in the column direction is formed between the adjacent main gate lines 10. That is, if we consider the structure between two adjacent finger lines 20 as one row, the structure of each odd-numbered row is the same, and the structure of each even-numbered row is the same.

Referring to fig. 3, a total of 3 auxiliary guide lines 30 are connected to both sides of the sub-grid line 20, one auxiliary guide line is connected to one side of the sub-grid line, and two auxiliary guide lines are connected to the other side of the sub-grid line. For one side of only one auxiliary guide line 30, the auxiliary guide line is located on the middle line of two adjacent main grid lines 10. For the side with two auxiliary guide lines 30, the two auxiliary guide lines 30 are both located at the position of quartering the distance between two adjacent main grid lines 10 (the quartering has three positions, and the auxiliary guide lines 30 are not arranged on the middle line because the quartering is staggered with the auxiliary guide lines 30 of the adjacent rows).

In one embodiment, each major grid line 10 is thicker than each minor grid line 20.

In one embodiment, the solar cell grid line printing screen further includes a fixing frame, and each of the main grid lines 10, the sub-grid lines 20, and the auxiliary guide lines 30 is disposed in the fixing frame.

It is to be understood that the main grid lines 10, the sub-grid lines 20 and the auxiliary guide lines 30 are used for printing grid lines forming a solar cell, and in one embodiment, the main grid lines 10, the sub-grid lines 20 and the auxiliary guide lines 30 are in a groove structure, i.e., grid line grooves.

In one embodiment, the solar cell grid line printing screen is used for printing a front electrode of a solar cell.

The application also provides a solar cell, which comprises a silicon substrate formed with a PN junction and a front electrode arranged on the front surface of the silicon substrate. The front electrode comprises a metal grid line, and the metal grid line is formed by printing the solar cell grid line printing screen printing plate according to any one of the embodiments.

In one embodiment, the solar cell adopts P-type silicon as a substrate, and an N-type impurity ion doped layer is formed on the front surface of the substrate to form a PN junction. In one embodiment, a silicon nitride anti-reflective film is deposited on the N-type impurity ion doped layer. The front surface of the solar cell is printed with grid lines formed by conductive metal and sintered to form a front electrode (printed by the solar cell grid line printing screen plate according to any embodiment), and the front electrode mainly functions to collect current generated after a PN junction is irradiated.

In one embodiment, the back side of the solar cell is further provided with a back surface field formed by printing a layer of aluminum paste and sintering.

In one embodiment, the solar cell further includes a back electrode, also for collecting current, which may be fabricated using the same process as the front electrode.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a solar cell grid line printing half tone which characterized in that includes:

the grid lines extend along the row direction and are arranged in a plurality of rows, and the grid lines are arranged in parallel;

a plurality of secondary grid lines extending along the row direction and arranged in a plurality of rows, wherein the row direction is vertical to the column direction, and the secondary grid lines connect the adjacent main grid lines;

the auxiliary guide lines are arranged between the adjacent auxiliary grid lines in the row direction and connect the adjacent auxiliary grid lines;

and the positions of all the auxiliary guide lines connected with the two sides of each auxiliary grid line in the row direction are staggered.

2. The solar cell grid line printing screen of claim 1, wherein each of the auxiliary guide lines extends in the column direction.

3. The solar cell grid line printing screen as claimed in claim 1 or 2, wherein the auxiliary guide lines are arranged in parallel with each other.

4. The solar cell grid line printing screen printing plate of claim 3, wherein for each auxiliary guide line connected to two opposite sides of two adjacent minor grid lines in the column direction, the position of each auxiliary guide line connected to one minor grid line in the row direction is the same as the position of each auxiliary guide line connected to another minor grid line in the row direction in a one-to-one correspondence manner, so that a repeating unit in the column direction is formed between the adjacent main grid lines.

5. The solar cell grid line printing screen as claimed in claim 4, wherein for the sub-grid lines with the auxiliary guide lines connected to both sides, the number of the auxiliary guide lines connected to the first side is 1, and is located on the center line of two adjacent main grid lines, and the number of the auxiliary guide lines connected to the second side is 2, and is located at a position that the distance between two adjacent main grid lines is quartered.

6. The solar cell grid line printing screen of claim 1, wherein each main grid line is thicker than each minor grid line.

7. The solar cell grid line printing screen of claim 1, wherein each main grid line is thicker than each auxiliary guide line.

8. The solar cell grid line printing screen printing plate of claim 1, further comprising a fixing wire frame, wherein each of the main grid lines, the sub-grid lines and the auxiliary guide lines are arranged in the fixing wire frame.

9. The solar cell grid line printing screen of claim 1, wherein the solar cell grid line printing screen is a front electrode grid line printing screen for printing a front electrode of a solar cell.

10. A solar cell, comprising:

a silicon substrate formed with a PN junction;

the front electrode is arranged on the first surface of the silicon substrate and comprises a metal grid line;

characterized in that the metal grid line is formed by the solar cell grid line printing screen printing of any one of claims 1 to 9.