CN217009203U

CN217009203U - Electrode grid line and solar cell

Info

Publication number: CN217009203U
Application number: CN202123432202.8U
Authority: CN
Inventors: 张皓; 夏正月
Original assignee: Tongwei Solar Chengdu Co Ltd
Current assignee: Tongwei Solar Chengdu Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-19
Anticipated expiration: 2031-12-30

Abstract

The utility model relates to an electrode grid line and a solar cell, wherein the electrode grid line comprises a main grid and an auxiliary grid which are vertically arranged. The number of the main grids is N, the N main grids are arranged at intervals, and the number N of the main grids is more than or equal to 13 and less than or equal to 30; the number of the auxiliary grids is n, the n auxiliary grids are arranged at intervals, the number n of the auxiliary grids is 80-200, and the number of the auxiliary grids is reduced along with the increase of the number of the main grids. The electrode grid line reduces the distance of current transmission on the auxiliary grid by increasing the number of the main grids, thereby reducing power loss. Meanwhile, as the number of the main grids is increased, the number of the auxiliary grids is reduced, so that the silver consumption is effectively reduced, and the cost is reduced. Meanwhile, shading of grid lines is reduced, and the current and the power of the solar cell are improved.

Description

Electrode grid line and solar cell

Technical Field

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

Background

As conventional fossil fuels are depleted, among the existing sustainable energy sources, solar energy is undoubtedly one of the cleanest, most widespread and most potential alternative energy sources. The solar power generation device is also called a solar cell or a photovoltaic cell, can directly convert solar energy into electric energy, and the power generation principle is based on the photovoltaic effect of a semiconductor PN junction. Solar photovoltaic is a clean energy source essential for human development due to its safety, low pollution and reproducibility as a strategic emerging energy industry, and has recently been valued and advocated by various countries. However, the cost of photovoltaic power generation is an important reason for restricting the wider application of photovoltaic products.

The TOPcon battery adopts an N-type silicon wafer, the front side of the TOPcon battery is boron-expanded to form a PN junction, the back side of the TOPcon battery is a SiOx tunneling layer and a polysilicon layer, and the front side and the back side of the TOPcon battery are plated with SiNx film layers for passivation and reaction reduction. The positive and negative electrodes of the TOPcon battery are all silver grid lines. Compared with the PERC battery with the front side adopting the silver grid lines and the back side adopting the aluminum grid lines, the TOPcon battery has higher cost because the silver consumption of the TOPcon battery is far larger than that of the PERC battery with the same size.

The conventional TOPcon battery generally adopts 12 main grids, the transmission distance of the current in the auxiliary grid is long, the loss is large, and the battery power is low. By increasing the number of the TOPcon battery main grids, the transmission distance of current on the auxiliary grid can be reduced, and the loss of power on the series resistance is reduced.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide an electrode grid line and a solar cell for reducing silver consumption and improving power of the solar cell.

In one aspect, the present application provides an electrode gate line, including:

the number of the main grids is N, the N main grids are arranged at intervals, and the number N of the main grids is more than or equal to 13 and less than or equal to 30;

the auxiliary grids are perpendicular to the main grids, the number of the auxiliary grids is n, the n auxiliary grids are arranged at intervals, the number n of the auxiliary grids is equal to or larger than 80 and equal to or smaller than 200, and the number of the auxiliary grids is reduced along with the increase of the number of the main grids.

The electrode grid line reduces the distance of current transmission on the auxiliary grid by increasing the number of the main grids, thereby reducing power loss. Meanwhile, as the number of the main grids is increased, the number of the auxiliary grids is reduced, so that the silver consumption is effectively reduced, and the cost is reduced. Meanwhile, shading of grid lines is reduced, and current and power of the solar cell are improved.

The technical solution of the present application is further described below:

in one embodiment, each of the sub-gates has a width of 20 μm to 50 μm, and the width of the sub-gate decreases as the number of the main gates increases.

In one embodiment, the width of each of the sub-gates is 20 μm to 50 μm, and the width of the sub-gate decreases as the number of the main gates increases.

In one embodiment, the N main grids are distributed at equal intervals, and the distance between every two adjacent main grids is 7-17 μm.

In one embodiment, the width of the main gate is 40 μm to 80 μm.

In one embodiment, the number N of the main gates is 16-25; the number n of the auxiliary gates is more than or equal to 132 and less than or equal to 180; the width of the auxiliary gate is 24-40 μm.

In one embodiment, the number N of the main gates is 22; the number n of the auxiliary gates is 132; the width of the auxiliary gate is 24 mu m; or the number N of the main gates is 22; the number n of the secondary gates is 140; the width of the sub-gate is 26 μm.

In one embodiment, m welding spots are arranged on each main grid at intervals, wherein m is more than or equal to 8 and less than or equal to 20; the size of the welding spot is 0.5mm²-3mm²。

On the other hand, the application also provides a solar cell, which comprises a front electrode and a back electrode which are oppositely arranged, wherein the front electrode and the back electrode are both provided with the electrode grid line.

In one embodiment, the number of the main grids of the front electrode is equal to that of the main grids of the back electrode.

In one embodiment, the number of the sub-grids of the front electrode is less than that of the sub-grids of the back electrode; the width of the sub-grid of the front electrode is smaller than that of the sub-grid of the back electrode.

The solar energy reduces the distance of current transmission on the auxiliary grid by increasing the number of the main grids, thereby reducing power loss. Meanwhile, as the number of the main grids is increased, the number of the auxiliary grids is reduced, so that the silver consumption is effectively reduced, and the cost is reduced. Meanwhile, shading of grid lines is reduced, and current and power of the solar cell are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electrode gate line according to an embodiment.

Description of reference numerals:

10. a main grid; 11. welding spots; 20. and (4) a secondary grid.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Specifically, one aspect of the present application provides a solar cell, such as a TOPcon solar cell. The solar cell comprises a positive electrode and a negative electrode which are oppositely arranged, and the positive electrode and the negative electrode are both provided with electrode grid lines. Furthermore, the electrode grid lines of the positive electrode and the electrode grid lines of the negative electrode of the TOPcon solar cell both adopt silver grid lines, so that the TOPcon solar cell is higher in cost.

The current TOPcon cell size of 210mm by 210mm typically uses 12 main grids with larger spacing. The photo-generated current of the battery is collected to the main grid through the auxiliary grid vertical to the main grid; when the distance between the main grids is larger, the transmission distance of the current in the auxiliary grids is long, the loss is more, and the power of the battery is lower. By increasing the number of the main grids, the transmission distance of current in the auxiliary grid can be reduced, and the loss of power on series resistance is reduced. Based on this, this application still provides an electrode grid line in another aspect.

Referring to fig. 1, an electrode gate line of an embodiment includes a main gate 10 and a sub-gate 20 that are vertically disposed. The number of the main grids 10 is N, and the N main grids 10 are arranged at intervals, for example, in the present embodiment, each main grid 10 extends along the vertical direction, and the N main grids 10 are sequentially arranged at intervals along the horizontal direction. Further, the number N of the main gates 10 is 13. ltoreq. N.ltoreq.30. When the number of the main grids 10 is less than 13, the distance between two adjacent main grids 10 is larger. The current transmission distance in the sub-grid 20 is long, and the loss is large, so that the battery power is low. When the number of the main grids 10 is greater than 30, silver consumption increases, resulting in an increase in cost, and a light-shielding area increases, reducing battery current. Therefore, the number N of the main grids 10 is set to be 13-30, so that the space between two adjacent main grids 10 is not too large, and the battery power is improved. Meanwhile, excessive silver consumption is avoided, and the cost is reduced.

Further, the number of the sub-grids 20 is n, and the n sub-grids 20 are arranged at intervals, for example, in the present embodiment, each sub-grid 20 extends along the horizontal direction, and the n sub-grids 20 are sequentially arranged at intervals along the vertical direction. Further, the number n of the sub-gates 20 is 80. ltoreq. n.ltoreq.200, and the number of the sub-gates 20 decreases as the number of the main gates 10 increases. When the number of the sub-grids 20 is less than 80, the battery power is low. When the number of the sub-grids 20 is more than 200, silver consumption increases, resulting in an increase in cost, and a light-shielding area increases, reducing battery current. Therefore, the number N of the auxiliary grids 20 is set to be 80-200, so that the battery power is ensured, excessive silver consumption is avoided, the cost is reduced, the shading area can be effectively reduced, and the battery current is increased. By reducing the number of the sub-gates 20 as the number of the main gates 10 increases, it is possible to control silver consumption and reduce cost while securing power.

Further, compared with the conventional solar cell with 12 main grids 10, the electrode grid line of the present application reduces the distance that current is transmitted on the secondary grid 20 by increasing the number of the main grids 10, thereby reducing power loss. Meanwhile, as the number of the main grids 10 is increased, the number of the auxiliary grids 20 is reduced, so that the silver consumption is effectively reduced, and the cost is reduced. Meanwhile, shading of grid lines is reduced, and current and power of the solar cell are improved.

Further, the width of each main gate 10 is 40 μm to 80 μm of the width of the main gate 10. The too wide width of the main grid 10 is easy to block light, which affects the power of the solar cell, and the too narrow width of the main grid 10 is not beneficial to the subsequent welding of other elements. Therefore, both light shielding and subsequent soldering are facilitated by configuring the width of the main grid 10 to be 40 μm-80 μm.

Further, the width of each of the sub-gates 20 is 20 μm to 50 μm, and the width of the sub-gate 20 decreases as the number of the main gates 10 increases. Specifically, the sub-grid 20 is too wide to block light, which affects the solar cell power, and the sub-grid 20 is too narrow to be easily broken. Therefore, the width of the secondary grid 20 is configured to be 20 μm-50 μm, so that the shading is avoided, and the strength of the secondary grid 20 is ensured, further compared with the conventional secondary grid 20, the width of the secondary grid 20 is reduced, and as the number of the main grids 10 is increased, the width of the secondary grid 20 is reduced, so that the shading of grid lines can be effectively reduced, and the power of the solar cell and the battery is improved.

Further, in one embodiment, the main grids 10 are distributed equidistantly, and the distance between two adjacent main grids 10 is 7 μm-17 μm. If the distance between the main grids 10 is too large, the transmission distance of the current in the auxiliary grid 20 is long, and the loss is large, so that the battery power is low. The distance between the main grids 10 is too small, so that the shading is easy, and the current and the power of the solar cell are reduced. Therefore, by configuring the pitch between the main grids 10 to be 7 μm to 17 μm, both the loss of current in the sub-grid 20 and the light shielding area are reduced, thereby improving the current and power of the solar cell.

Further, the number of the main grids 10 of the front electrode is equal to the number of the main grids 10 of the back electrode. And the number of the sub-grids 20 of the front electrode is less than the number of the sub-grids 20 of the back electrode; the width of the sub-grid 20 of the front electrode is smaller than that of the sub-grid 20 of the back electrode, so that the shading area of the electrode grid line of the front electrode to the back electrode is reduced, and the current and the power of the solar cell are improved.

Preferably, in some of these embodiments, the number N of the main gates 10 is 16 ≦ N ≦ 25; the number n of the auxiliary gates 20 is more than or equal to 132 and less than or equal to 180; the width of the sub-gate 20 is: 24-40 μm.

The effect of the number of primary grids 10, the number of secondary grids 20 and the width of the secondary grids 20 on the silver consumption and the power of the module is explained below by several specific examples for a TOPcon solar cell, 66 version module, of size 210mm x 210 mm:

TABLE 1

Referring to table 1, table 1 is a table of the influence of the number of main gates, the number of sub-gates, and the width of the sub-gates on the silver consumption and the power of the device.

In a comparative example, the number of the main grids 10 of the front electrode and the back electrode is 12, the number of the sub-grids 20 of the front electrode is 150, and the width of the sub-grids 20 is 35; the number of the sub-gates 20 of the back electrode is 200, and the width of the sub-gate 20 is 40. At this time, the silver consumption is 238 mg, and the power of the assembly is 681W.

In example 1, the number of the main grids 10 of the front electrode and the back electrode is 16, the number of the sub-grids 20 of the front electrode is 144, and the width of the sub-grids 20 is 30; the number of the sub-gates 20 of the back electrode is 180, and the width of the sub-gate 20 is 35. At this time, the silver consumption is 202 mg, and the assembly power is 684.8W.

In example 2, the number of the main grids 10 of the front electrode and the back electrode is 18, the number of the sub-grids 20 of the front electrode is 140, and the width of the sub-grids 20 is 28; the number of the sub-gates 20 of the back electrode is 160, and the width of the sub-gate 20 is 30. At this time, the silver consumption is 178 mg, and the assembly power is 685.1W.

In example 3, the number of the main grids 10 of the front surface electrode and the back surface electrode is 20, the number of the sub-grids 20 of the front surface electrode is 134, and the width of the sub-grids 20 is 26; the number of the sub-gates 20 of the back electrode is 140, and the width of the sub-gate 20 is 28. At this time, the silver consumption is 160 mg, and the power of the assembly is 684.9W.

In example 4, the number of the main grids 10 of the front surface electrode and the back surface electrode is 22, the number of the sub-grids 20 of the front surface electrode is 132, and the width of the sub-grids 20 is 24; the number of the sub-gates 20 of the back electrode is 140, and the width of the sub-gate 20 is 26. At this time, the silver consumption is 152 mg, and the power of the assembly is 685W.

As can be seen from the comparison of examples 1 to 4 with the comparative example, the silver consumption can be effectively reduced and the power of the solar cell can be increased by increasing the number of the main grids 10 and simultaneously reducing the number of the sub-grids 20 and the width of the sub-grids 20.

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 express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

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

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" 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 and do not denote a unique embodiment.

Claims

1. An electrode grid line, comprising:

2. The electrode grid line of claim 1, wherein the width of each of the secondary gates is 20-50 μm, and the width of the secondary gates decreases as the number of primary gates increases.

3. The electrode grid line of claim 1, wherein N of the primary grids are equally spaced, and the spacing between two adjacent primary grids is 7 μm to 17 μm.

4. The electrode grid line of claim 1, wherein the width of the primary grid is from 40 μ ι η to 80 μ ι η.

5. The electrode grid line of claim 1, wherein the number N of primary gates is 16 ≦ N ≦ 25; the number n of the auxiliary gates is more than or equal to 132 and less than or equal to 180; the width of the auxiliary gate is 24-40 μm.

6. The electrode grid line of claim 5;

the number N of the main gates is 22; the number n of the auxiliary gates is 132; the width of the auxiliary gate is 24 mu m; or,

the number N of the main gates is 22; the number n of the auxiliary gates is 140; the width of the sub-gate is 26 μm.

7. The electrode grid line of claim 1, wherein m solder joints are spaced on each of the main grids, wherein m is greater than or equal to 8 and less than or equal to 20; the size of the welding spot is 0.5mm²-3mm²。

8. A solar cell comprising a front electrode and a back electrode disposed opposite to each other, wherein the front electrode and the back electrode are each provided with an electrode grid line according to any one of claims 1 to 7.

9. The solar cell of claim 8, wherein the number of main grids of the front electrode is equal to the number of main grids of the back electrode.

10. The solar cell of claim 8, wherein the number of subgrids of the front electrode is less than the number of subgrids of the back electrode; the width of the auxiliary grid of the front electrode is smaller than that of the auxiliary grid of the back electrode.