CN220829965U - Solar cell, photovoltaic module and printing screen - Google Patents

Abstract

The application relates to the technical field of photovoltaics, in particular to a solar cell, a photovoltaic module and a printing screen. In the solar cell, the photovoltaic module and the printing screen, the grid line structure of the solar cell at least comprises a main grid line, thin grid lines and connecting lines, each of the plurality of main grid lines is connected with any one of the plurality of thin grid lines through the connecting lines, and the connecting lines which are unevenly distributed are formed by setting the size of the plurality of connecting lines corresponding to at least one main grid line along a first direction to have at least two size specifications, so that the sizes of the plurality of connecting lines corresponding to the main grid line along the first direction are relatively smaller and larger. Therefore, the reliability of the grid line structure is improved, the manufacturing cost is reduced, the shading area of the grid line structure is reduced, and the optical loss of the solar cell is further reduced, so that the power generation efficiency of the solar cell is improved.

Description

Solar cell, photovoltaic module and printing screen

Technical Field

The application relates to the technical field of photovoltaics, in particular to a solar cell, a photovoltaic module and a printing screen.

Background

In the related art, a metal paste is printed on the front and/or back of a substrate of a solar cell through a screen printing process to form corresponding main and fine grid lines. In the process, the situation that the main grid line falls off when the thin grid line is printed, the grid is broken at the joint of the main grid line and the thin grid line, the thin grid line is fused in the welding process and the like easily occurs. In order to improve the reliability of the grid line structure, the main grid lines and the corresponding thin grid lines are connected by connecting lines.

However, the connecting wires set in the above process not only increase the amount of metal paste, resulting in increased manufacturing cost, but also increase the light shielding area of the grid line structure, resulting in increased optical loss of the solar cell, and further reduced power generation efficiency of the solar cell.

Disclosure of Invention

Based on this, it is necessary to provide a solar cell, a photovoltaic module, and a printing screen to improve the reliability of the grid structure, reduce the manufacturing cost, and improve the power generation efficiency of the solar cell.

According to one aspect of the present application, an embodiment of the present application provides a solar cell including a substrate and a gate line structure disposed on the substrate; the grid line structure comprises:

a plurality of main grid lines arranged at intervals along a first direction;

A plurality of thin gate lines arranged at intervals along the second direction; and

A plurality of connection lines, each of the plurality of main gate lines being connected to any one of the plurality of thin gate lines through a connection line;

The size of the connecting lines corresponding to the at least one main grid line along the first direction has at least two sizes;

the first direction and the second direction are perpendicular to each other.

In one embodiment, defining a main grid line corresponding to connecting lines of at least two dimensions as a target main grid line;

And at least one connecting line with other dimension specifications is arranged between at least one group of adjacent connecting lines with the same dimension specification along the second direction in the plurality of connecting lines corresponding to the same target main grid line.

In one embodiment, the plurality of connection lines corresponding to the same target main gate line include a plurality of first specification connection lines and at least one second specification connection line;

The first specification connecting line is a connecting line with the largest size along the first direction in a plurality of connecting lines connected with the same target main grid line;

the second specification connecting line is a connecting line with the smallest dimension along the first direction in a plurality of connecting lines connected with the same target main grid line;

at least one second specification connecting line is arranged between at least one group of two adjacent first specification connecting lines along the second direction.

In one embodiment, among the plurality of connection lines connected to the same target main gate line, the first specification connection lines and the second specification connection lines are alternately arranged in order along the second direction.

In one embodiment, each connection line is configured to be symmetrically disposed about a main gate line connected to the connection line; and/or

Along the first direction, the dimension of the connecting line along the second direction is smaller as the distance from the main grid line connected with the connecting line is larger.

In one embodiment, the minimum dimension of the portion of the connection line connected to the thin gate line along the second direction is not smaller than the dimension of the connection line connected to the thin gate line along the second direction; and/or

The maximum dimension of the connecting line in the first direction is 500 to 1500 micrometers, and the minimum dimension of the connecting line in the first direction is 50 to 900 micrometers.

In one embodiment, the further the connection line is from the portion of the main gate line connected to the connection line in the first direction, the smaller the dimension in the third direction is;

The third direction is perpendicular to the first direction and the second direction, respectively.

In one embodiment, the maximum sizes of the plurality of connection lines connected with the same main gate line along the third direction are equal; and/or

The reduction rate of the dimension in the third direction of the connecting line having the largest dimension in the first direction is not greater than the reduction rate of the dimension in the third direction of the connecting line having the smallest dimension in the first direction.

According to another aspect of the present application, an embodiment of the present application provides a photovoltaic module including the solar cell of any one of the above embodiments.

According to yet another aspect of the present application, an embodiment of the present application provides a printing screen for preparing the solar cell of any one of the above embodiments;

The printing screen comprises a main grid printing line and a connecting printing line, wherein the main grid printing line corresponds to the main grid line, and the connecting printing line corresponds to the connecting line; or alternatively

The printing screen comprises fine grid printing lines and connecting printing lines, wherein the fine grid printing lines correspond to the fine grid lines, and the connecting printing lines correspond to the connecting lines; or alternatively

The printing screen comprises a main grid printing line, a fine grid printing line and a connecting printing line, wherein the main grid printing line corresponds to the main grid line, the fine grid printing line corresponds to the fine grid line, and the connecting printing line corresponds to the connecting line.

In the solar cell, the photovoltaic module and the printing screen, the solar cell comprises a substrate and a grid line structure arranged on the substrate, the grid line structure at least comprises a main grid line, thin grid lines and connecting lines, each of the plurality of main grid lines is connected with any one of the plurality of thin grid lines through the connecting lines, and the dimension of the plurality of connecting lines corresponding to at least one main grid line along a first direction is set to have at least two dimension specifications, so that the dimension of the plurality of connecting lines corresponding to the main grid line along the first direction is relatively smaller and larger, and the connecting lines which are unevenly arranged are formed. Therefore, the reliability of the grid line structure is improved, the manufacturing cost is reduced, the shading area of the grid line structure is reduced, and the optical loss of the solar cell is further reduced, so that the power generation efficiency of the solar cell is improved.

Drawings

Fig. 1 is a schematic structural diagram of a solar cell according to an embodiment of the application.

Fig. 2 is a schematic diagram of a portion of a gate line structure according to an embodiment of the application.

Fig. 3 is a schematic view of a partial enlarged structure at a in fig. 1.

Fig. 4 is a schematic view of a portion of a gate line structure according to another embodiment of the application.

Fig. 5 is a schematic view of a portion of a gate line structure according to another embodiment of the application.

Fig. 6 is a schematic view of a portion of a gate line structure according to another embodiment of the application.

Fig. 7 is a schematic diagram illustrating a partial cross-sectional structure of a gate line structure according to an embodiment of the application.

Fig. 8 is a schematic diagram illustrating a partial cross-sectional structure of a gate line structure according to another embodiment of the present application.

Fig. 9 is a schematic view showing a structure of a printing screen according to an embodiment of the present application.

Reference numerals illustrate:

a main gate line 100, a target main gate line 100a;

A thin gate line 200;

The connection line 300, the first specification connection line 300a, the second specification connection line 300b, the first dimension d1, the second dimension d2, and the third dimension d3;

A main gate printed line 10 connected to the printed line 20;

The first direction F1, the second direction F2, and the third direction F3.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If 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, if any, are for descriptive purposes only and do not represent a unique embodiment.

Currently, in order to meet the requirement of mass production, in the process of manufacturing a solar cell, a screen printing process is generally used to print a metal paste (such as a silver/silver-aluminum paste) on the surface of a substrate, and then a corresponding grid line structure is formed through low-temperature baking and high-temperature sintering, so as to lead out a photo-generated carrier. Specifically, the metal paste may be printed on the back surface of the substrate to form a back surface main grid line, then the back surface main grid line is baked, and then the back surface thin grid line is printed, wherein the printing travel direction of the back surface thin grid line is perpendicular to the back surface main grid line. And then, turning over the substrate by a sheet turning machine, and manufacturing a corresponding grid line structure on the front surface of the substrate in the mode of manufacturing the grid line structure on the back surface of the substrate.

The number, height and width of the grid lines printed on the surface of the substrate and the connection design of the corresponding grid lines can have important influence on the photoelectric conversion efficiency, unit consumption, yield and component welding technical requirements of the solar cell. In the above process, there are at least the following problems: 1. when the assembly is welded at high temperature, the thin grid line is easy to fuse due to low melting point and small width when the thin grid line is subjected to high temperature because the width of the thin grid line is smaller than that of the main grid line; 2. the printing direction of the thin grid line is perpendicular to the main grid line when the thin grid line is printed, and the main grid line can be acted by the scraper, so that the main grid line falls off from the substrate; 3. the connection of the main gate line and the thin gate line is easy to generate a broken gate. Thereby, the reliability of the gate line structure is to be improved.

In order to improve the reliability of the grid line structure, the main grid lines and the corresponding thin grid lines are connected by connecting lines. However, the added connecting wires not only increase the usage amount of the metal paste, which increases the manufacturing cost, but also increase the shading area of the grid line structure, which increases the optical loss of the solar cell and further reduces the power generation efficiency of the solar cell.

Based on this, in order to solve at least part of the above problems, embodiments of the present application provide a solar cell, which improves the structure of a connection line in a grid line structure of the solar cell, so as to reduce manufacturing cost and improve power generation efficiency of the solar cell while improving reliability of the grid line structure.

Referring to fig. 1, fig. 1 shows a schematic structure of a solar cell according to an embodiment of the application, the solar cell includes a substrate, a front surface and a back surface of the substrate are respectively provided with a grid line structure, and the grid line structures on the two surfaces are respectively two poles of the solar cell.

The solar cell may be an N-type solar cell or a P-type solar cell. Of course, the solar cell may also be another type of solar cell. May be used according to specific use cases, and embodiments of the present application are not particularly limited thereto.

FIG. 2 is a schematic diagram of a portion of a gate line structure according to an embodiment of the application; for convenience of explanation, only matters related to the embodiments of the present application are shown.

In some embodiments, please continue to refer to fig. 1 in combination with fig. 2, a gate line structure is provided according to an embodiment of the present application, which includes a plurality of main gate lines 100, a plurality of thin gate lines 200, and a plurality of connection lines 300. The plurality of main gate lines 100 are arranged at intervals along the first direction F1. The plurality of thin gate lines 200 are spaced apart along the second direction F2.

The first direction F1 is parallel to the width direction of the main gate line 100, and is perpendicular to the length direction of the main gate line 100. The second direction F2 is perpendicular to the longitudinal direction of the thin gate line 200 and is parallel to the width direction of the thin gate line 200. The first direction F1, the second direction F2, and a third direction F3, which will be shown later, are perpendicular to each other.

The main grid line 100 is a printed conductor, and the function of the main grid line 100 is to conduct current generated by the solar cell due to incident photons. The main grid line 100 is used to conduct current from the thin grid line 200, adjacent solar cells and/or external circuits connected thereto. The main gate lines 100 may be configured to extend in a straight direction, that is, the main gate lines 100 are arranged in a straight line, and the main gate lines 100 are arranged in parallel. Of course, the main gate line 100 may also have an arc shape, a folded line shape, a curved line shape, or the like. For example, fig. 1 and 2 illustrate a case where the main gate line 100 is disposed in a straight line.

The thin gate line 200 is a printed conductor, and the thin gate line 200 may be in ohmic contact with a substrate of the solar cell and electrically connected with the corresponding main gate line 100. The thin gate lines 200 may be configured to extend in a straight direction, that is, the thin gate lines 200 are arranged in a straight line, and the thin gate lines 200 are arranged in parallel. Of course, the thin gate line 200 may also have an arc shape, a folded shape, a curved shape, or the like. For example, fig. 1 illustrates a case where the thin gate lines 200 are arranged in a straight line.

The connection line 300 is a printed conductor, and each of all the main gate lines 100 is connected to any one of all the thin gate lines 200 through the connection line 300. The size of the plurality of connection lines 300 corresponding to the at least one main gate line 100 along the first direction F1 has at least two dimensions. That is, the main gate line 100 corresponding to the connection line 300 of at least two sizes is defined as the target main gate line 100a, the dimension of the connection line 300 along the first direction F1 is the first dimension d1, and the first dimension d1 of at least two different connection lines 300 among the plurality of connection lines 300 connected to the same target main gate line 100a is different.

In this manner, by setting the first sizes d1 of the plurality of connection lines 300 corresponding to the same target main gate line 100a to have at least two sizes, the connection lines 300 unevenly arranged are formed such that there are relatively smaller first sizes d1 and larger first sizes d1 among the first sizes d1 of the plurality of connection lines 300 connected to the same target main gate line 100 a.

It is understood that the plurality of connection lines 300 corresponding to the same target main gate line 100a may improve the firmness of the target main gate line 100 a. The present inventors have studied and found that taking the example of printing the main grid line 100 first and then printing the thin grid line 200, the magnitude of the scraping force applied to the main grid line 100 can be regarded as being approximately within a determinable range, and the first dimension d1 of the plurality of connection lines 300 connected to the same target main grid line 100a is not identical as compared with the case where the first dimension d1 of the plurality of connection lines 300 connected to the same target main grid line 100a is identical, so as to satisfy the requirement of the stability of the main grid line 100. Meanwhile, the first dimension d1 of the plurality of connection lines 300 connected to the same target main gate line 100a may be regarded as a plurality of larger first dimensions d1, and the smaller first dimension d1 present in the first dimension d1 when the first dimension d1 of the plurality of connection lines 300 connected to the same target main gate line 100a is not identical may reduce the manufacturing cost and the light shielding area of the gate line structure. In addition, since each of the plurality of main gate lines 100 is connected to any one of the plurality of thin gate lines 200 through the connection line 300, the aforementioned problems of the thin gate lines 200 fusing and the gate breaking at the connection of the main gate lines 100 and the thin gate lines 200 can still be improved.

Note that, the plurality of main gate lines 100 may be target main gate lines 100a, or a part of the main gate lines may be target main gate lines 100a, and another part may be non-target main gate lines. The non-target main gate line is the same as the first dimension d1 of the plurality of connection lines 300 connected to the same non-target main gate line with respect to the target main gate line 100 a. In the case where the plurality of main gate lines 100 are each a target main gate line 100a, the plurality of connection lines 300 connected to the respective target main gate lines 100a may be arranged in the same manner or may be arranged in different manners. Taking fig. 3 as an example, fig. 3 shows a schematic view of a partial enlarged structure at a position a in fig. 1, where a plurality of main gate lines 100 are target main gate lines 100a, and the arrangement manners of connection lines 300 connected to two adjacent target main gate lines 100a are different along the first direction F1. Similarly, the arrangement of the connection lines 300 connected to different main gate lines 100 may be the same or different. Of course, among the plurality of connection lines 300 corresponding to the same target main gate line 100a, the plurality of connection lines 300 may be all connection lines 300 corresponding to the same target main gate line 100a or may be part of connection lines 300 among all connection lines 300 corresponding to the same target main gate line 100 a. The number and arrangement of the target main gate lines 100a may be set according to a specific use case, and the embodiment of the present application is not particularly limited thereto.

Therefore, the reliability of the grid line structure is improved, the manufacturing cost is reduced, the shading area of the grid line structure is reduced, and the optical loss of the solar cell is further reduced, so that the power generation efficiency of the solar cell is improved.

FIG. 4 is a schematic diagram showing a portion of a gate line structure according to another embodiment of the present application; for convenience of explanation, only matters related to the embodiments of the present application are shown.

In some embodiments, please continue to refer to fig. 4, among the plurality of connection lines 300 corresponding to the same target main gate line 100a, at least one connection line 300 with other dimensions is disposed between at least one group of adjacent connection lines 300 with the same dimension along the second direction F2. In the above-described process, when a plurality of connection lines 300 of other dimensions are arranged, the first dimension d1 of the connection lines 300 of other dimensions in the first direction may be the same or different.

In this way, the further unevenly arranged connection lines 300 are more advantageous for improving the firmness of the main gate line 100.

In some embodiments, referring to fig. 4, the plurality of connection lines 300 corresponding to the same target main gate line 100a includes a plurality of first specification connection lines 300a and at least one second specification connection line 300b. The first specification connection line 300a is a connection line having a maximum size along the first direction F1 among the plurality of connection lines 300 connected to the same target main gate line 100 a. The second specification connection line 300b is a connection line 300 having a minimum size along the first direction F1 among the plurality of connection lines 300 connected to the same target main gate line 100 a. Wherein, along the second direction F2, at least one second specification connecting line 300b is disposed between at least one group of two adjacent first specification connecting lines 300 a.

In this way, since the first dimension d1 of the first specification connecting line 300a along the first direction F1 is the maximum dimension and the first dimension d2 of the second specification connecting line 300b along the first direction F1 is the minimum dimension in the plurality of connecting lines 300 connected to the same target main gate line 100a, the above arrangement manner can further enhance the firmness of the main gate line 100 by means of the mutual cooperation between the first specification connecting line 300a and the second specification connecting line 300 b.

Illustratively, along the second direction F2, at least one second specification connecting line 300b is disposed between two adjacent first specification connecting lines 300 a. That is, among the plurality of connection lines 300 connected to the same target main gate line 100a, there is no case where there is no second specification connection line 300b between two adjacent first specification connection lines 300a along the second direction F2. For example, along the second direction F2, the first specification connecting line 300a and the second specification connecting line 300b may be arranged in such a manner that the first specification connecting line 300a, the second specification connecting line 300b, the first specification connecting line 300a, and the second specification connecting line 300b … …. Taking an example that one second specification connecting line 300b is disposed between two adjacent first specification connecting lines 300a along the second direction F2, connecting lines 300 having a first dimension d1 between a maximum dimension and a minimum dimension (i.e., other specifications) may be disposed between the first specification connecting lines 300a and the second specification connecting lines 300b, and the number of the connecting lines 300 may be at least one. May be set according to a specific use case, and the embodiment of the present application is not particularly limited thereto.

In this way, at least one second specification connecting line 300b is disposed between two adjacent first specification connecting lines 300a, and the first dimension d1 of the first specification connecting line 300a is greater than the first dimension d2 of the second specification connecting line 300b, so that connecting lines with larger dimension specifications are further disposed in a scattered manner, which is more beneficial to improving the firmness of the main gate line 100.

FIG. 5 is a schematic diagram showing a portion of a gate line structure according to another embodiment of the present application; for convenience of explanation, only matters related to the embodiments of the present application are shown.

In some embodiments, referring to fig. 5, among the plurality of connection lines 300 connected to the same target main gate line 100a, the first specification connection lines 300a and the second specification connection lines 300b are sequentially and alternately arranged along the second direction F2. That is, among the plurality of connection lines 300 connected to the same target main gate line 100a, the first specification connection line 300a and the second specification connection line 300b are arranged in the first specification connection line 300a, the second specification connection line 300b, and the first specification connection line 300a … … along the second direction F2.

In this way, by alternately arranging the first specification connecting lines 300a and the second specification connecting lines 300b along the second direction F2, the first specification connecting lines 300a and the second specification connecting lines 300b can be further matched with each other, and the firmness of the main gate line 100 can be further improved, compared with the case that one first specification connecting line 300a has another first specification connecting line 300a adjacent to the first specification connecting line along the second direction F2, or one second specification connecting line 300b has another second specification connecting line 300b adjacent to the second specification connecting line along the second direction F2.

Of course, taking an example that one second specification connecting line 300b is disposed between two adjacent first specification connecting lines 300a along the second direction F2, a connecting line 300 having a first dimension d1 between a maximum dimension and a minimum dimension may be disposed between the first specification connecting lines 300a and the second specification connecting lines 300b, and the number of the connecting lines 300 may be at least one. Specifically, the connection lines 300 arranged between the first specification connection line 300a and the second specification connection line 300b are provided in a plurality, and the closer the plurality of connection lines 300 is to the first dimension d1 of the first specification connection line 300a (or the second specification connection line 300 b) is larger. Taking fig. 6 as an example, fig. 6 shows a schematic view of a portion of a gate line structure according to still another embodiment of the present application, among a plurality of connection lines 300 connected to the same target main gate line 100a, the first dimensions d1 of the connection lines 300 are arranged in order of increasing, decreasing, increasing, and decreasing … … along the second direction F2. May be set according to a specific use case, and the embodiment of the present application is not particularly limited thereto.

In some embodiments, referring to fig. 5, each connection line 300 is configured to be symmetrically disposed about the main gate line 100 connected to the connection line 300. In this way, the risk of gate breakage of the main gate line 100 along both sides of the second direction F2 can be further reduced.

In some embodiments, referring to fig. 5, the further away the connection line 300 is from the main gate line 100 connected to the connection line 300 along the first direction F1, the dimension (i.e. the second dimension d 2) of the connection line 300 along the second direction F2 tends to decrease. "decreasing trend" may include stepwise decreases, such as decrease first, then no change, decrease later, etc.; it may also include a constant decrease, such as a uniform decrease in speed or a decrease in speed followed by a decrease in speed. In particular, in some embodiments, the further the dimension of the connection line 300 along the second direction F2 along the first direction F1, the smaller the distance between the main gate lines 100 connected to the connection line 300. The "smaller" may be a linear decrease (as shown in fig. 5) or a non-linear decrease. The "decreasing trend" and "smaller" illustrated in some embodiments hereinafter follow the foregoing related descriptions and will not be repeated. Can be correspondingly arranged according to actual use requirements, and the embodiment of the application is not particularly limited.

Since the portion of the connection line 300, which is farther from the main gate line 100 connected to the connection line 300, is connected to the corresponding thin gate line 200, the width of the thin gate line 200 (i.e., the dimension along the second direction F2) may be smaller than the width of the main gate line 100 (i.e., the dimension along the first direction F1), and by setting the dimension of the portion of the connection line 300 connected to the corresponding thin gate line 200 along the second direction F2 to be smaller than the dimension of the portion of the connection line 300 connected to the corresponding main gate line 100 along the second direction F2, the light shielding area may be further reduced, and the manufacturing cost may be further reduced.

In some embodiments, referring to fig. 5, the minimum dimension of the portion of the connection line 300 connected to the fine gate line 200 along the second direction F2 is not smaller than the dimension of the connection line 200 along the second direction F2. Thus, the broken gate of the thin gate line 200 can be improved, the light shielding area can be further reduced, and the manufacturing cost can be further reduced.

In some embodiments, referring to fig. 5, the maximum dimension of the connection line 300 along the first direction F1 is 500 micrometers to 1500 micrometers, and the minimum dimension of the connection line 300 along the first direction F1 is 50 micrometers to 900 micrometers. It is understood that the maximum dimension is greater than the minimum dimension. That is, taking the case that the first specification connecting line 300a is the connecting line 300 having the largest dimension and the second specification connecting line 300b is the connecting line 300 having the smallest dimension as an example in some embodiments, the first dimension d1 of the first specification connecting line 300a is 500 micrometers to 1500 micrometers, and the first dimension d1 of the second specification connecting line 300b is 50 micrometers to 900 micrometers, of course, the first dimension d1 of the first specification connecting line 300a is larger than the first dimension d1 of the second specification connecting line 300 b. For example, the first dimension d1 of the first gauge wire 300a may be 500 microns, 600 microns, 700 microns, 900 microns, 1100 microns, 1400 microns, or 1500 microns. The first dimension d1 of the second gauge wire 300b may be 50 microns, 60 microns, 80 microns, 200 microns, 400 microns, 800 microns, or 900 microns. May be set according to a specific use case, and the embodiment of the present application is not particularly limited thereto.

In this way, the light shielding area can be reduced, the manufacturing cost can be reduced, the damage of the main grid line 100 by the doctor blade can be improved by providing the range of the maximum size of the connecting line 300 in the first direction F1, the firmness of the main grid line 100 can be further improved, and the aforementioned problems of breakage and fusing can be improved by providing the range of the minimum size of the connecting line 300 in the first direction F1.

FIG. 7 is a schematic diagram showing a partial cross-sectional structure of a gate line structure according to an embodiment of the present application; for convenience of explanation, only matters related to the embodiments of the present application are shown.

In some embodiments, referring to fig. 7, the further the connection line 300 is away from the portion of the main gate line 100 connected to the connection line 300 along the first direction F1, the dimension along the third direction F3 (i.e. the third dimension d 3) tends to decrease. Specifically, the further the connection line 300 is from the portion of the main gate line 100 connected to the connection line 300 in the first direction F1, the smaller the dimension in the third direction F3 is.

Thus, by reducing the gradient of the connecting line 300, not only the light shielding area can be reduced, the manufacturing cost can be reduced, but also the probability of gate breakage can be reduced.

In some embodiments, please continue to refer to fig. 7, the maximum sizes of the plurality of connection lines 300 connected to the same main gate line 100 along the third direction F3 are equal. In this way, the connection line 300 is conveniently printed.

In some embodiments, please continue with fig. 7, the decreasing rate of the dimension of the connecting line 300 along the third direction F3, which has the largest dimension along the first direction F1, is not greater than the decreasing rate of the dimension of the connecting line 300 along the third direction F3, which has the smallest dimension along the first direction F1. Since the third dimension d3 of the connection line 300 is related to the film thickness, the yarn thickness, and the openings of the screen corresponding thereto, it is convenient to manufacture the screen.

Illustratively, continuing to take fig. 7 as an example, the plurality of connection lines 300 connected to the same main gate line 100 are equal in maximum dimension along the third direction F3. Along the first direction F1, the reduction rate of the dimension of the connecting line 300 along the third direction F3, which has the largest dimension along the first direction F1, is smaller than the reduction rate of the dimension of the connecting line 300 along the third direction F3, which has the smallest dimension along the first direction F1. That is, the gradient of the connecting line 300 having the largest dimension in the first direction F1 is smaller than the gradient of the connecting line 300 having the smallest dimension in the first direction F1.

In some embodiments, please continue to refer to fig. 7, the main gate line 100 and the connection line 300 connected to the main gate line 100 are integrated. Different cross hatching is used to facilitate distinguishing between main gate line 100 and connecting line 300. The integrated structure refers to a structure manufactured by an integrated molding process. That is, the main gate line 100 and the connection line 300 may be simultaneously printed.

In some embodiments, please continue to refer to fig. 1 and 3, the plurality of main gate lines 100 are all target main gate lines 100a, and referring to fig. 5, among the plurality of connection lines 300 connected to the same main gate line 100, the connection line 300 adjacent to the first specification connection line 300a is the second specification connection line 300b along the second direction F2. Among the plurality of connection lines 300 connected to the same thin gate line 200, the connection line 300 adjacent to the first specification connection line 300a is the second specification connection line 300b along the first direction F1. That is, the arrangement of the connection lines 300 to which the adjacent main gate lines 100 are connected is different.

In this way, the first specification connecting lines 300a and the second specification connecting lines 300b are staggered in the first direction F1 and the second direction F2, and the first specification connecting lines and the second specification connecting lines are matched with each other, so that the light shielding area can be reduced, the manufacturing cost can be reduced, and the reliability of the grid line structure can be further improved.

Thus, by the gate line structure illustrated in some of the above embodiments, a desired structure can be selected more flexibly. In addition, the light shielding area can be further reduced and the manufacturing cost can be reduced on the basis of meeting the reliability of the grid line structure through the cooperation of the first specification connecting line 300a and the second specification connecting line 300b and the cooperation of the first dimension d1, the second dimension d2 and the third dimension d3 of the connecting line 300.

FIG. 8 is a schematic diagram showing a partial cross-sectional structure of a gate line structure according to another embodiment of the present application; for convenience of explanation, only matters related to the embodiments of the present application are shown.

In other embodiments, the thin gate line 200 and the connection line 300 connected to the thin gate line 200 are formed as a single structure. That is, the thin gate line 200 and the connection line 300 may be printed at the same time. At this time, as shown in fig. 8, a portion of the connection line 300 is covered on the main gate line 100. In still other embodiments, the main gate line 100, the connection line 300 connected to the main gate line 100, and the thin gate line 200 connected to the connection line 300 are in a unitary structure. That is, the main gate line 100, the thin gate line 200, and the connection line 300 may be simultaneously printed.

Thus, the corresponding printing form can be flexibly selected according to the specific use condition.

Based on the same inventive concept, the embodiment of the application provides a photovoltaic module, which comprises the solar cell in any embodiment. The solar cell of any of the above embodiments has advantages, and the photovoltaic module provided in the embodiments of the present application also has advantages, and is not described herein.

It is understood that the photovoltaic module may comprise a plurality of solar cells. A plurality of solar cells may be connected to form a cell string. The photovoltaic module may include at least one string of cells. The solar cells in the cell string may be connected in such a manner that the front electrode of one solar cell is electrically connected to the back electrode of an adjacent solar cell through an interconnection bar, and the solar cells in the same cell string may be connected through the interconnection bar. The specific connection structure of the battery string may be set according to actual use conditions, and the embodiment of the present application is not particularly limited thereto.

Based on the same inventive concept, the embodiment of the application provides a printing screen used for preparing the solar cell in any embodiment. It will be appreciated that a printing screen may comprise a frame and a mesh being tensioned inside the frame, the mesh comprising a printing area provided with corresponding printing lines for the transparence printing.

As an implementation manner, as shown in fig. 9, fig. 9 illustrates a schematic structure of a printing screen according to an embodiment of the present application, where the printing screen includes main grid printed lines 10 and connection printed lines 20, the main grid printed lines 10 correspond to the main grid lines 100, and the connection printed lines 20 correspond to the connection lines 300. That is, the main gate line 100 and the connection line 300 may be printed together. As another embodiment, the printing screen includes fine grid printing lines corresponding to the fine grid lines 200 and connection printing lines 20 corresponding to the connection lines 300. That is, the thin gate line 200 and the connection line 300 may be printed together. As another embodiment, the printing screen includes a main gate printing line 10, a fine gate printing line corresponding to the main gate line 100, and a connection printing line 20 corresponding to the connection line 300, the fine gate printing line corresponding to the fine gate line 200. That is, the main gate line 100, the thin gate line 200, and the connection line 300 may be printed together.

The solar cell of any of the above embodiments has advantages, and the printing screen provided in the embodiments of the present application also has advantages, and is not described herein.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. The solar cell is characterized by comprising a substrate and a grid line structure arranged on the substrate; the gate line structure includes:

a plurality of main grid lines arranged at intervals along a first direction;

A plurality of thin gate lines arranged at intervals along the second direction; and

A plurality of connection lines through which each of the plurality of main gate lines is connected to any one of the plurality of thin gate lines;

The size of the connecting lines corresponding to at least one main grid line along the first direction is at least two sizes;

The first direction and the second direction are perpendicular to each other.

2. The solar cell according to claim 1, wherein the main grid line corresponding to the connection lines of at least two dimensional specifications is defined as a target main grid line;

and at least one connecting line with other dimension specifications is arranged between at least one group of adjacent connecting lines with the same dimension specification along the second direction in a plurality of connecting lines corresponding to the same target main grid line.

3. The solar cell of claim 2, wherein the plurality of connection lines corresponding to the same target main grid line includes a plurality of first specification connection lines and at least one second specification connection line;

The first specification connecting line is a connecting line with the largest size along the first direction in a plurality of connecting lines connected with the same target main grid line;

the second specification connecting line is a connecting line with the smallest dimension along the first direction in a plurality of connecting lines connected with the same target main grid line;

And at least one second specification connecting line is arranged between at least one group of two adjacent first specification connecting lines along the second direction.

4. The solar cell according to claim 3, wherein the first specification connection lines and the second specification connection lines are alternately arranged in the second direction in order among the plurality of connection lines connected to the same target main grid line.

5. The solar cell of any one of claims 1-4, wherein each of the connection lines is configured to be symmetrically disposed about the main grid line to which it is connected; and/or

Along the first direction, the dimension of the connecting line along the second direction is smaller as the connecting line is far away from the main grid line connected with the connecting line.

6. The solar cell according to any one of claims 1 to 4, wherein a minimum dimension of a portion of the connection line connected to the thin grid line in the second direction is not smaller than a dimension of the connection line connected to the thin grid line in the second direction; and/or

The maximum dimension of the connecting line along the first direction is 500 micrometers to 1500 micrometers, and the minimum dimension of the connecting line along the first direction is 50 micrometers to 900 micrometers.

7. The solar cell according to any one of claims 1 to 4, wherein the further the connection line is from the portion of the main grid line connected to the connection line in the first direction, the smaller the dimension in the third direction is;

The third direction is perpendicular to the first direction and the second direction, respectively.

8. The solar cell according to claim 7, wherein a maximum size of the plurality of connection lines connected to the same main grid line in the third direction is equal; and/or

Along the first direction, a reduction rate of a dimension of a connecting line having a largest dimension along the first direction along the third direction is not greater than a reduction rate of a dimension of a connecting line having a smallest dimension along the first direction along the third direction.

9. A photovoltaic module comprising a solar cell according to any one of claims 1-8.

10. A printing screen for producing a solar cell according to any one of claims 1 to 8;

The printing screen comprises a main grid printing line and a connecting printing line, wherein the main grid printing line corresponds to the main grid line, and the connecting printing line corresponds to the connecting line; or alternatively

The printing screen comprises fine grid printing lines and connecting printing lines, wherein the fine grid printing lines correspond to the fine grid lines, and the connecting printing lines correspond to the connecting lines; or alternatively

The printing screen comprises a main grid printing line, a fine grid printing line and a connecting printing line, wherein the main grid printing line corresponds to the main grid line, the fine grid printing line corresponds to the fine grid line, and the connecting printing line corresponds to the connecting line.