CN214898464U - Solar cell and cell module capable of saving grid line slurry - Google Patents

Abstract

The application is suitable for the technical field of solar cells, and provides a solar cell and a cell module which save grid line slurry. The solar cell saving the grid line slurry comprises a cell substrate; the main grid is arranged on the battery substrate; the fine grid is arranged on the battery substrate and is lapped with the main grid in a crossing area; and the first hollow area is formed in the thin grid, and the orthographic projection of the first hollow area on the battery substrate is positioned in the orthographic projection of the intersection area on the battery substrate. Thus, the efficiency and the reliability of the solar cell are not reduced, the slurry can be saved, and the cost can be reduced.

Description

Solar cell and cell module capable of saving grid line slurry

Technical Field

The application belongs to the technical field of solar cells, and particularly relates to a solar cell and a cell module capable of saving grid line slurry.

Background

In the solar cell in the related art, the sub-grid is printed step by step, and the main grid and the sub-grid are overlapped in a superposition mode. However, the paste at the lap joint covers each other, which causes a certain loss of paste, resulting in a higher cost of the solar cell. Therefore, how to save the grid line slurry to reduce the cost becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The application provides a solar cell and a battery pack which save grid line slurry, and aims to solve the problem of how to save the grid line slurry so as to reduce cost.

In a first aspect, the present application provides a solar cell saving a gate line paste, including:

a battery substrate;

the main grid is arranged on the battery substrate;

the fine grid is arranged on the battery substrate and is lapped with the main grid in a crossing area;

and the first hollow area is formed in the fine grid, and the orthographic projection of the first hollow area on the battery substrate is positioned in the orthographic projection of the intersection area on the battery substrate.

Optionally, the first hollow-out area is rectangular.

Optionally, the length of the first hollow-out area ranges from 0.04mm to 0.07mm, and the width of the first hollow-out area ranges from 0.03mm to 0.05 mm.

Optionally, the length of the first hollow-out area is 0.06mm, and the width of the first hollow-out area is 0.03 mm.

Optionally, the fine grid is formed with a second hollow-out area, and an orthogonal projection of the second hollow-out area on the battery substrate is located outside an orthogonal projection of the intersection area on the battery substrate.

Optionally, the second hollow-out area is circular.

Optionally, the diameter of the second hollow-out area ranges from 0.02mm to 0.04 mm.

Optionally, the diameter of the second hollow-out area is 0.02 mm.

Optionally, the number of the second hollow-out areas is multiple, and the center-to-center distance between two adjacent second hollow-out areas located on the same side of the intersection area is 0.03mm-0.06 mm.

In a second aspect, the present application provides a battery module comprising a solar cell of any of the above.

In the solar cell and the cell module capable of saving the grid line slurry provided by the embodiment of the application, the thin grid is provided with the first hollow area, and the orthographic projection of the first hollow area on the cell substrate is positioned in the orthographic projection of the cross area on the cell substrate, so that the slurry can be saved and the cost can be reduced while the efficiency and the reliability of the solar cell are not reduced.

Drawings

Fig. 1 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a solar cell saving a grid line paste according to an embodiment of the present application.

Description of the main element symbols:

the solar cell comprises a solar cell 10, a cell substrate 12, a main grid 14, a third hollow-out area 141, a fourth hollow-out area 142, a cross area 15, a fine grid 16, a first hollow-out area 161, a second hollow-out area 162,

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.

In the related art, the gate lines of the solar cell are mutually covered at the lap joint, causing slurry loss. The solar cell capable of saving the grid line slurry provided by the embodiment of the application is provided with the first hollow-out area on the thin grid, so that the slurry can be saved.

Referring to fig. 1, a solar cell 10 saving grid line paste provided in the embodiment of the present application includes a cell substrate 12, a main grid 14, and a fine grid 16; the main grid 14 is arranged on the battery substrate 12; fine grids 16 are provided on the cell substrate 12 and overlap the main grids 14 at the intersection areas 15. The first hollow-out region 161 is formed on the fine grid 16, and the orthogonal projection of the first hollow-out region 161 on the battery substrate 12 is located in the orthogonal projection of the intersection region 15 on the battery substrate 12.

The solar cell 10 capable of saving the grid line paste provided by the embodiment of the application is provided with the first hollow-out area 161 on the fine grid 16, and the orthographic projection of the first hollow-out area 161 on the cell substrate 12 is located in the orthographic projection of the cross area 15 on the cell substrate 12, so that the paste can be saved and the cost can be reduced while the efficiency and the reliability of the solar cell 10 are not reduced.

It is understood that the intersection region 15 refers to a region where the main gate 14 and the fine gate 16 intersect. Since the main gate 14 and the fine gate 16 intersect at the intersection region 15, the main gate 14 and the fine gate 16 can be electrically connected, so that the main gate 14 can collect the current collected by the fine gate 16.

It can be understood that the orthographic projection of the first hollow-out area 161 on the battery substrate 12 is located in the orthographic projection of the intersection area 15 on the battery substrate 12, and means that the orthographic projection of the intersection area 15 on the battery substrate 12 covers and exceeds the orthographic projection of the first hollow-out area 161 on the battery substrate 12. Thus, the thin gate 16 is ensured to be continuous, and the first hollow area 161 is prevented from causing the thin gate 16 to be disconnected.

Specifically, the cell substrate 12 may include a silicon substrate, a diffusion layer, a passivation layer, a front side antireflective layer, and a back side antireflective layer.

Specifically, in the present embodiment, the main gate 14 and the fine gate 16 are formed by a step Print (DUP) process. The first hollow-out region 161 allows a printing area to be reduced, so that paste can be saved.

Specifically, the main gate 14 and the fine gate 16 may be a silver gate line and/or an aluminum gate line. In other words, the paste may be a silver paste and/or an aluminum paste.

Specifically, in the present embodiment, the fine grid 16 overlaps the main grid 14 from the side of the main grid 14 facing away from the cell substrate 12. In other words, the fine grid 16, the main grid 14, and the cell substrate 12 are sequentially stacked.

It is understood that in other embodiments, fine grate 16 may overlap main grate 14 from the side of main grate 14 adjacent to cell substrate 12. In other words, the main grid 14, the fine grid 16, and the cell substrate 12 are sequentially stacked. The specific stacking relationship of the cell substrate 12, the main grid 14, and the fine grid 16 is not limited herein.

Specifically, in the present embodiment, the main grid 14 and the fine grid 16 are both straight, and the angle formed by the intersection of the main grid 14 and the fine grid 16 is a right angle. Therefore, the main grid 14 and the fine grid 16 are regularly arranged, so that the preparation is convenient, and the production efficiency of the solar cell is improved.

It is understood that in other embodiments, only one of the main grid 14 and the fine grid 16 may be straight, and the other may be curved, broken, or otherwise irregular; the main grid 14 and the fine grid 16 may not be straight, for example, the main grid 14 is curved, broken or other irregular line, and the fine grid 16 is curved, broken or other irregular line. In addition, the angle formed by the intersection of the main grid 14 and the fine grid 16 may be acute. The specific shape and specific intersection of the main grid 14 and the fine grid 16 are not limited herein.

In the present embodiment, the first hollow 161 is rectangular. Thus, the shape of the first hollow-out area 161 is regular, which is convenient for preparation and is beneficial to improving the production efficiency of the solar cell 10. Moreover, the shape of the first hollow-out area 161 is consistent with that of the intersection area 15, so that the stress of the fine grid 16 on the non-hollow-out part of the intersection area 15 is balanced, and the risk of breaking the fine grid 16 is reduced.

It is understood that in other embodiments, the first hollow 161 may have a track shape, an oval shape, a circular shape, a polygonal shape, or other shapes.

Specifically, in the present embodiment, the center of the first hollow-out area 161 coincides with the center of the intersection area 15. Thus, the first hollow-out area 161 is located at the central position of the intersection area 15, so that the areas of the fine grid 16 which are not hollow out are symmetrical, and the risk of breaking the fine grid 16 is reduced.

Optionally, the length x of the first hollow-out area 161 ranges from 0.04mm to 0.07mm, and the width y of the first hollow-out area 161 ranges from 0.03mm to 0.05 mm. Thus, the size of the first hollow-out area 161 is in a proper range, so that the thin grid 16 is prevented from being easily broken due to an excessively large size, and the slurry is prevented from being saved less due to an excessively small size. The slurry can be saved as much as possible while the reliability of the fine grid 16 is ensured.

Specifically, the length x of the first hollow area 161 is, for example, 0.04mm, 0.042mm, 0.045mm, 0.048mm, 0.05mm, 0.051mm, 0.055mm, 0.059mm, 0.06mm, 0.062mm, 0.065mm, 0.068mm, 0.07 mm.

Specifically, the width y of the first hollow-out area 161 is, for example, 0.03mm, 0.031mm, 0.033mm, 0.035mm, 0.038mm, 0.04mm, 0.042mm, 0.045mm, 0.048mm, 0.05 mm.

In this embodiment, the length x of the first hollow area 161 is 0.06mm, and the width y of the first hollow area 161 is 0.03 mm. Thus, the performance of the solar cell 10 is best balanced with paste savings.

Referring to fig. 2, optionally, the fine grid 16 is formed with a second hollow-out region 162, and an orthogonal projection of the second hollow-out region 162 on the battery substrate 12 is located outside an orthogonal projection of the intersection region 15 on the battery substrate 12. Therefore, the second hollow-out area 162 is separated from the first hollow-out area 161, and the situation that the hollow-out area is too large due to the fact that the second hollow-out area 162 is communicated with the first hollow-out area 161 is avoided, so that the risk that the thin grid 16 is prone to being broken is reduced. Moreover, the second hollow-out region 162 can reduce the coverage of the cell substrate 12 by the fine grid 16, so that the area of the cell substrate 12 contacting sunlight is larger, and the photoelectric conversion efficiency is improved.

In the present embodiment, the second hollow-out region 162 is circular. Thus, the second hollow-out region 162 has a regular shape, and is convenient to prepare, which is beneficial to improving the production efficiency of the solar cell 10. Moreover, the second hollow-out region 162 has a different shape from the first hollow-out region 161, which facilitates positioning of the screen when the grid lines are printed, and is beneficial to improving the production efficiency of the solar cell 10.

It is understood that in other embodiments, the second hollow-out region 162 may have a racetrack shape, an oval shape, a rectangular shape, a polygonal shape, or other shapes.

Optionally, the diameter d of the second hollow-out area 162 ranges from 0.02mm to 0.04 mm. For example, 0.02mm, 0.021mm, 0.023mm, 0.025mm, 0.028mm, 0.03mm, 0.032mm, 0.035mm, 0.038mm, 0.04 mm. Therefore, the size of the second hollow-out area 162 is in a proper range, the situation that the fine grid 16 is easily broken due to an overlarge size is avoided, and the situation that less slurry is saved due to an undersize size is also avoided. The slurry can be saved as much as possible while the reliability of the fine grid 16 is ensured.

In the present embodiment, the diameter d of the second hollow-out area 162 is 0.02 mm. Thus, the performance of the solar cell 10 is best balanced with paste savings.

Optionally, the number of the second hollow-out areas 162 is multiple, and the central distance z between two adjacent second hollow-out areas 162 located on the same side of the intersection area 15 ranges from 0.03mm to 0.06 mm. For example, 0.03mm, 0.031mm, 0.033mm, 0.035mm, 0.038mm, 0.04mm, 0.042mm, 0.045mm, 0.048mm, 0.05mm, 0.051mm, 0.055mm, 0.057mm, 0.06 mm.

Thus, more slurry can be saved through the plurality of second hollow-out regions 162. Moreover, the center distance z between two adjacent second hollow-out areas 162 is within a proper range, which not only prevents the thin grid 16 from being easily broken due to too small center distance, but also prevents the slurry from being saved less due to too large center distance. The slurry can be saved as much as possible while the reliability of the fine grid 16 is ensured.

In the present embodiment, the center-to-center distance z between two adjacent second hollow areas 162 is 0.045 mm. Thus, the performance of the solar cell 10 is best balanced with paste savings.

Specifically, the second hollow areas 162 have the same size, and the centers of the second hollow areas 162 are located on a straight line. So, the arrangement of a plurality of second fretwork district 162 is comparatively normal, is convenient for improve production efficiency.

Referring to fig. 3, optionally, the fine grid 16 includes an intersection 163 and a non-intersection 164, an orthographic projection of the intersection 163 on the cell substrate 12 coincides with an orthographic projection of the intersection 15 on the cell substrate 12, and a fine grid width of the intersection 163 is greater than a fine grid width of the non-intersection 164. Thus, the width of the fine grid 16 at the intersection region 15 is made larger, and the risk of breaking the fine grid 16 can be reduced.

Specifically, in the example of fig. 3, the width of the non-intersection 164 gradually decreases in a direction away from the intersection 163. As such, further slurry savings may be achieved by reducing the width of the non-intersection 164. Moreover, the width is gradually reduced, so that the thin grid 16 is prevented from being easily broken due to the sudden reduction of the width, and the reliability of the solar cell 10 can be improved.

Referring to fig. 4, optionally, the main grid 14 is formed with a third hollow-out area 141, and an orthogonal projection of the third hollow-out area 141 on the battery substrate 12 is located outside an orthogonal projection of the intersection area 15 on the battery substrate 12. In this way, further paste savings can be achieved by hollowing out the main grid 14. Moreover, the third hollow-out area 141 is located outside the intersection area 15, so that the contact area of the main grid 14 and the fine grid 16 in the intersection area 15 is prevented from being too small, and a good conduction effect of the main grid 14 and the fine grid 16 is ensured. In addition, the third hollow-out area 141 can reduce the coverage of the cell substrate 12 by the fine grid 16, so that the area of the cell substrate 12 contacting sunlight is larger, and the photoelectric conversion efficiency is improved.

Specifically, in the present embodiment, the third hollow-out area 141 is rectangular. Thus, the third hollow-out area 141 has a regular shape, which is convenient for preparation and is beneficial to improving the production efficiency of the solar cell 10.

It is understood that in other embodiments, the third hollow area 141 may also have a racetrack shape, an oval shape, a circular shape, a polygonal shape, or other shapes.

Specifically, the number of the third hollow areas 141 may be multiple, each of the third hollow areas 141 has the same size, and the centers of the multiple third hollow areas 141 are located on a straight line. Thus, the third hollow-out areas 141 can further save slurry. Moreover, the arrangement of the third hollow-out areas 141 is more standard, which is convenient for improving the production efficiency.

Referring to fig. 5 and fig. 6, optionally, the main grid 14 is formed with a fourth hollow area 142, and an orthogonal projection of the fourth hollow area 142 on the battery substrate 12 is covered by an orthogonal projection of the intersection area 15 on the battery substrate 12. In other words, the orthographic projection of the fourth hollow area 142 on the battery substrate 12 is within the orthographic projection of the intersection area 15 on the battery substrate 12. Thus, the slurry can be further saved by the fourth hollow area 142.

It can be understood that the orthographic projection of the main grid 14 on the cell substrate 12 at the un-hollowed part of the intersection region 15 and the orthographic projection of the fine grid 16 on the cell substrate 12 at the un-hollowed part of the intersection region 15 at least partially overlap. In this way, the main gate 14 and the fine gate 16 are ensured to be in contact at the un-hollowed part of the intersection region 15, so that the main gate 14 and the fine gate 16 can be conducted.

Referring to fig. 5, specifically, the orthographic projection of the fourth hollow area 142 on the battery substrate 12 is covered by the orthographic projection of the first hollow area 161 on the battery substrate 12. In other words, the orthographic projection of the fourth hollow area 142 on the battery substrate 12 is located within the orthographic projection of the first hollow area 161 on the battery substrate 12. In this way, the main gate 14 and the fine gate 16 are electrically connected based on the contact of the fine gate 16 in the region corresponding to the non-hollowed-out portion of the intersection region 15.

Referring to fig. 6, specifically, the orthographic projection of the first hollow area 161 on the battery substrate 12 is covered by the orthographic projection of the fourth hollow area 142 on the battery substrate 12. In other words, the first hollow-out region 161 is located within the orthographic projection of the fourth hollow-out region 142 on the battery substrate 12 in the orthographic projection of the battery substrate 12. In this way, the main gate 14 and the fine gate 16 are electrically connected based on the contact of the main gate 14 in the region corresponding to the non-hollowed-out portion of the intersection region 15.

Referring to fig. 7, specifically, the orthographic projection of the first hollow area 161 on the battery substrate 12 is spaced from the orthographic projection of the fourth hollow area 142 on the battery substrate 12. In this manner, the main gate 14 and the fine gate 16 are made conductive based on the contact of the region corresponding to the space portion.

The battery module provided by the embodiment of the present application includes the solar cell 10 described above.

The battery module of the embodiment of the application is provided with the first hollow-out area 161 at the fine grid 16, and the orthographic projection of the first hollow-out area 161 on the battery substrate 12 is located in the orthographic projection of the cross area 15 on the battery substrate 12, so that the paste can be saved and the cost can be reduced while the efficiency and the reliability of the solar battery 10 are not reduced.

For the explanation and explanation of the battery assembly, reference is made to the foregoing description, and the description is omitted here for the sake of avoiding redundancy.

According to the solar cell and the cell module capable of saving the grid line paste, the wet weight is reduced by 1-3%, and a Damp Heat (DH) test is equal to a scheme without hollowing. Obviously, the solar cell and the cell module which save the grid line paste in the embodiment of the application can save the paste and reduce the cost without reducing the efficiency and the reliability of the solar cell 10.

Specifically, in one example, the length x of the first hollow-out area 161 is 0.06mm, the width y of the first hollow-out area 161 is 0.03mm, the diameter d of the second hollow-out area 162 is 0.02mm, and the center-to-center distance z between two adjacent second hollow-out areas 162 is 0.045 mm. Therefore, the wet weight can be reduced by 1.7% relative to the unpopulated scheme, the front photoelectric conversion efficiency can be improved by 0.02%, and the Damp Heat (DH) test is equivalent to the unpopulated scheme.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (10)

1. A solar cell saving grid line paste, comprising:

a battery substrate;

the main grid is arranged on the battery substrate;

the fine grid is arranged on the battery substrate and is lapped with the main grid in a crossing area;

and the first hollow area is formed in the fine grid, and the orthographic projection of the first hollow area on the battery substrate is positioned in the orthographic projection of the intersection area on the battery substrate.

2. The grid line paste saving solar cell of claim 1, wherein the first hollow-out area is rectangular.

3. The solar cell of claim 2, wherein the first hollow-out region has a length in a range of 0.04mm to 0.07mm and a width in a range of 0.03mm to 0.05 mm.

4. The solar cell of claim 3, wherein the first hollowed-out area is 0.06mm long and 0.03mm wide.

5. The grid line paste saving solar cell of claim 1, wherein the fine grid is formed with a second hollow-out region, and an orthographic projection of the second hollow-out region on the cell substrate is located outside an orthographic projection of the intersection region on the cell substrate.

6. The grid line paste saving solar cell of claim 5, wherein the second hollow area is circular.

7. The grid line paste saving solar cell of claim 6, wherein the diameter of the second hollow area ranges from 0.02mm to 0.04 mm.

8. The grid line paste saving solar cell of claim 7, wherein the diameter of the second hollowed-out area is 0.02 mm.

9. The solar cell capable of saving grid line paste according to claim 5, wherein the number of the second hollow-out areas is multiple, and the center-to-center distance between two adjacent second hollow-out areas on the same side of the intersection area is in a range of 0.03mm to 0.06 mm.

10. A battery module comprising the solar cell according to any one of claims 1 to 9.

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