CN213459750U

CN213459750U - Electrode structure and solar cell

Info

Publication number: CN213459750U
Application number: CN202022481625.8U
Authority: CN
Inventors: 潘鹏飞; 钱伟华; 来俊男; 周国栋
Original assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Current assignee: Zhejiang Jinko Solar Co Ltd; Jinko Solar Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-06-15
Anticipated expiration: 2030-10-30

Abstract

The embodiment of the utility model provides a relate to solar photovoltaic technical field, disclose an electrode structure and solar cell. The embodiment of the utility model provides an in electrode structure, be applied to solar cell, include: the grid structure comprises a plurality of main grids extending along the first direction and arranged along the second direction, and a plurality of groups of auxiliary grids arranged along the second direction, wherein each group of auxiliary grids comprises a plurality of thin grids extending along the second direction and arranged along the first direction, and the thin grids in any two adjacent groups of auxiliary grids are distributed in a staggered manner and are connected through the same main grid. The embodiment of the utility model provides an electrode structure and solar cell can form closed metal figure, simultaneously, improves the inhomogeneous problem of metal half tone tension, avoids metal half tone deformation and damage.

Description

Electrode structure and solar cell

Technical Field

The embodiment of the utility model provides a relate to solar photovoltaic technical field, in particular to electrode structure and solar cell.

Background

In recent years, with the development of solar cell electrode silver paste printing technology, the industry has made higher technical requirements on the aspect ratio and the like of a screen plate for solar cell subline printing after silver paste printing, but the existing printing screen plate is a woven screen plate and has the following defects: the woven silk screen plate has warp and weft nodes, so that marks are easily generated on a printing stock, and slurry blockage is easily formed to cause broken printing grids. In order to prevent the printed matter from generating marks and meet the requirement of hyperfine printing, the metal screen without net knots is produced.

The inventor finds that at least the following problems exist in the prior art: because the metal screen is formed by a single-layer metal film and lacks a corresponding woven wire composite material for supporting, a closed metal pattern cannot be formed on a steel plate, and the longer auxiliary grid can influence the tension of the metal screen to cause the deformation and the damage of the metal screen.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide an electrode structure and solar cell can form closed metal figure, simultaneously, improves the inhomogeneous problem of metal half tone tension, avoids metal half tone deformation and damaged.

In order to solve the above technical problem, an embodiment of the present invention provides an electrode structure for a solar cell, including: the grid structure comprises a plurality of main grids extending along the first direction and arranged along the second direction, and a plurality of groups of auxiliary grids arranged along the second direction, wherein each group of auxiliary grids comprises a plurality of thin grids extending along the second direction and arranged along the first direction, and the thin grids in any two adjacent groups of auxiliary grids are distributed in a staggered manner and are connected through the same main grid.

The embodiment of the utility model also provides a solar cell, include: the battery comprises a battery body and the electrode structure, wherein the electrode structure is arranged on the surface of the battery body.

Compared with the prior art, the embodiment of the utility model, because the electrode structure includes: a plurality of main grids extending along the first direction and arranged along the second direction, and a plurality of groups of auxiliary grids arranged along the second direction, wherein each group of auxiliary grids comprises a plurality of thin grids extending along the second direction and arranged along the first direction, the thin grids in any two adjacent groups of auxiliary grids are connected through the same main grid, a plurality of main gates extending along the first direction and a plurality of fine gates extending along the second direction are connected to form a closed metal pattern, in addition, compared with the scheme that the whole thin grid is not disconnected in the prior art, in the embodiment of the utility model, the electrode structure comprises a plurality of groups of auxiliary grids arranged along the second direction, the thin grids in any two adjacent groups of auxiliary grids are connected through the same main grid, the sectional fine grids are arranged along the second direction, so that the length of an opening on the metal screen plate for forming the fine grids is shorter, the problem of uneven tension of the metal screen plate is solved, and the deformation and damage of the metal screen plate are avoided; meanwhile, the fine grids in any two adjacent sets of auxiliary grids are distributed in a staggered mode, so that the structural strength is improved, and the problem that the screen printing plate is easy to damage at the broken positions of the auxiliary grids is solved, the broken distance between the two adjacent sets of auxiliary grids in the second direction can be correspondingly reduced, and the reliable lap joint of the fine grids and the main grids is further ensured.

In addition, in the second direction, the fine grids in two adjacent groups of sub-grids are arranged at intervals.

In addition, in the second direction, the distance between the fine grids in two adjacent groups of sub-grids is less than 1 millimeter. So set up, be favorable to the reliable contact between thin bars and the main bars.

In addition, in the second direction, the fine grids in the two adjacent groups of the sub grids are arranged in an overlapping mode, and in the first direction, the adjacent fine grids in the two adjacent groups of the sub grids are arranged at intervals in the overlapping portion. By the arrangement, the problem that the fine grid and the main grid cannot be connected and disconnected to conduct current due to slight deviation in the production process can be prevented.

In addition, the length of the overlapping part of the fine grids in the two adjacent groups of the auxiliary grids is less than 1 millimeter. By the arrangement, reliable contact between the fine grid and the main grid can be ensured, and the problem that the tension of the metal screen is influenced by overlong length of the fine grid can be avoided.

In addition, in the second direction, the fine grids in the two adjacent groups of the sub grids are arranged in alignment, and in the first direction, the adjacent fine grids in the two adjacent groups of the sub grids are arranged at intervals at the overlapping part.

In addition, the fine grids in the two groups of sub grids adjacent to any one group of sub grids are correspondingly leveled in the first direction one by one.

In addition, in the first direction, the distance between the adjacent fine grids in the two adjacent groups of the auxiliary grids ranges from 1.0 millimeter to 1.8 millimeters. So set up, can enough avoid the problem that the interval undersize, metal half tone are fragile, can avoid the interval too big again, lead to the problem that the fine bars quantity is too little on the first direction.

In addition, the length of the fine grid in each group of the sub-grids ranges from 8 millimeters to 30 millimeters, and the width of the fine grid in each group of the sub-grids ranges from 20 micrometers to 1.5 millimeters. The length range of the fine grids in each group of the auxiliary grids is 8-30 mm, so that the problems that the fine grids are too long and the metal screen is easy to damage can be solved, and the matching with a proper number of main grids can be ensured; in addition, the width range of the fine grid in each group of the auxiliary grids is set to be 20 micrometers to 1.5 millimeters, so that the problems that the width of the fine grid is too small and good contact is difficult to form and the number of the fine grids in the first direction is too small due to too large width of the fine grid can be avoided.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of an electrode structure according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another electrode structure according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

The first embodiment of the present invention relates to an electrode structure applied to a solar cell, as shown in fig. 1, including: many main bars 11 and multiunit auxiliary grid 12, many main bars 11 extend along first direction X and arrange along second direction Y, multiunit auxiliary grid 12 arranges along second direction Y, and every group auxiliary grid 12 includes and extends along second direction Y and many thin bars 121 that arrange along first direction X, and thin bars 121 in arbitrary two sets of adjacent auxiliary grid 12 stagger distribution, and link to each other via same main bar 11.

Since the electrode structure includes: the metal pattern comprises a plurality of main gates 11 extending along the first direction X and arranged along the second direction Y, and a plurality of groups of sub-gates 12 arranged along the second direction Y, wherein each group of sub-gates 12 comprises a plurality of fine gates 121 extending along the second direction Y and arranged along the first direction X, the fine gates 121 in any two adjacent groups of sub-gates 12 are connected through the same main gate 11, and are connected through the plurality of main gates 11 extending along the first direction X and the plurality of fine gates 121 extending along the second direction Y, so that a closed metal pattern is formed, namely, the metal pattern is formed by two parts of a DUP (distributed printing) mode formed by the main gates 11 and the sub-gates 12.

And, compare the scheme that the whole root of thin bars 121 does not break off among the prior art, the embodiment of the utility model provides an because electrode structure includes the multiunit vice bars 12 of arranging along second direction Y, thin bars 121 in arbitrary two sets of adjacent vice bars 12 link to each other via same main bars 11, it has many sectional type thin bars 121 to arrange along second direction Y promptly, the opening length who is used for forming thin bars 121 on the metal screen printing board is shorter, thereby the inhomogeneous problem of tension that longer thin bars 121 brought has been improved, the easy damage of metal screen printing board deformation has been avoided, the life of metal screen printing board has been prolonged, the grid line that screen printing board deformation leads to utilizing the preparation of screen printing board to thicken the problem has been avoided simultaneously, electrode structure's preparation precision has been improved.

Meanwhile, the fine grids 121 in any two adjacent sets of the auxiliary grids 12 are distributed in a staggered manner (namely, the staggered multi-segment auxiliary grids 12), so that the structural strength is improved, and the problem that the screen printing plate is easily damaged at the broken part of the auxiliary grid 12 is solved, so that the broken distance of the two adjacent sets of the auxiliary grids 12 in the second direction Y can be properly reduced, and the reliable overlapping of the fine grids 121 and the main grid 11 is further ensured.

In the present embodiment, the fine grids 121 in two adjacent sets of the sub-grids 12 are spaced apart from each other in the second direction Y, and the distance a between the fine grids 121 in two adjacent sets of the sub-grids 12 may be smaller than 1mm in the second direction Y, so that the arrangement is favorable for reliable contact between the fine grids 121 and the main grid 11.

Specifically, the plurality of fine gates 121 in each group of the sub-gates 12 are arranged at equal intervals, and the intervals between the fine gates 121 in the plurality of groups of the sub-gates 12 are equal. Further, in the first direction X, the adjacent fine grids 121 in the two adjacent sets of sub-grids 12 may be spaced apart or overlapped (at this time, the two adjacent sets of sub-grids 12 are still spaced apart, and only overlap in the first direction), specifically, in the first direction X, the distance c between the adjacent fine grids 121 in the two adjacent sets of sub-grids 12 may be in the range of 0 to 2mm (preferably, 1.0 mm to 1.8 mm), or alternatively, in the first direction X, the overlapping size of the adjacent fine grids 121 in the two adjacent sets of sub-grids 12 may be in the range of 0 to 2 mm.

As shown in fig. 2, in the second direction Y, the fine gates 121 in two adjacent sets of the sub-gates 12 may also be overlapped (i.e., the fine gates 121 and the main gates 11 form a cross connection), and at this time, in the first direction X, the adjacent fine gates 121 in two adjacent sets of the sub-gates 12 are also spaced at an overlapping portion, i.e., the lengths of two ends of the spaced fine gate lines are extended to form a good metal contact with the main gates, so as to prevent the problem that the fine gates 121 and the main gates 11 are disconnected from conducting current due to slight deviation in the production process. Further, the length b of the overlapping part of the fine grids 121 in two adjacent sets of the sub-grids 12 can be less than 1mm, so that the reliable contact between the fine grids 121 and the main grid 11 can be ensured, and the problem that the tension of the metal screen is affected due to the overlong length of the fine grids 121 can be avoided. At this time, in the first direction X, the adjacent fine grids 121 in the two adjacent sets of the sub-grids 12 are arranged at intervals, and the range of the distance c between the adjacent fine grids 121 in the two adjacent sets of the sub-grids 12 may be 1.0 mm to 1.8 mm, so that the problems that the distance is too small and the metal screen is easily damaged can be avoided, and the problem that the number of the fine grids 121 in the first direction X is too small due to too large distance can also be avoided.

Of course, in the second direction Y, the fine gates 121 in two adjacent sets of the sub-gates 12 may also be aligned, and at this time, in the first direction X, the adjacent fine gates 121 in two adjacent sets of the sub-gates 12 are also disposed at intervals at the overlapping portion, that is, in the second direction Y, the distance between the fine gates 121 in two adjacent sets of the sub-gates 12 is zero, and details are not repeated here.

In the present embodiment, the fine grids 121 in the two sets of sub-grids 12 adjacent to any one set of sub-grids 12 are aligned in the first direction X in a one-to-one correspondence, that is, the fine grids 121 in the odd set of sub-grids 12 are aligned in a one-to-one correspondence, and the fine grids 121 in the even set of sub-grids 12 are aligned in a one-to-one correspondence, that is, the fine grids 121 in the odd set of sub-grids 12 are staggered from the fine grids 121 in the even set of sub-grids 12.

In practical applications, the length of the fine grid 121 in each set of the sub-grids 12 may range from 8 mm to 30 mm, the width of the fine grid 121 in each set of the sub-grids 12 ranges from 20 micrometers to 1.5 mm, and the number of the fine grids 121 ranges from 80 to 140. The length range of the fine grids 121 in each group of the auxiliary grids 12 is set to be 8 mm to 30 mm, so that the problems that the fine grids 121 are too long and the metal screen is easy to damage can be solved, and the matching with a proper number of main grids 11 can be ensured; moreover, by setting the width range of the fine gate 121 in each set of the sub-gates 12 to be 20 micrometers to 1.5 millimeters, the problem that the number of the fine gates 121 in the first direction X is too small due to too small width of the fine gate 121 and difficult to form good contact can be avoided, and the problem that the number of the fine gates 121 in the first direction X is too small due to too large width of the fine gate 121 can be avoided.

Compared with the prior art, the embodiment of the utility model, because the inventor finds that the trompil length of metal film half tone is overlength can lead to half tone tension inhomogeneous, easily produce deformation, thereby cause half tone life to descend, the grid line adds thick scheduling problem, so made the sectional type design to the vice bars 12 line (usually many segment structure in the prior art between 8-15), make the opening length that is used for forming thin bars 121 on the metal half tone shorter, improved the inhomogeneous problem of metal half tone tension, avoided metal half tone deformation and damage, and grid line to add thick problem; meanwhile, the inventor finds that the breaking distance of the auxiliary grids 12 is influenced by the strength of the material matrix, the single length is usually not less than 0.2mm, otherwise, the metal film is broken and damaged, but based on the fact that the width of the main grid 11 is usually less than 0.1mm, the broken auxiliary grids 12 cannot be lapped with the main grid 11, and the current cannot be conducted, therefore, the design of the staggered auxiliary grids 12 is provided, namely, the fine grids 121 in any two adjacent groups of auxiliary grids 12 are distributed in a staggered mode and are not located on the same horizontal line, so that the structural strength is improved, the problem that the broken parts of the auxiliary grids 12 of the screen printing plate are easily damaged is solved, the distance between the fine grids 121 in the two adjacent groups of auxiliary grids 12 in the second direction Y can be properly reduced, and the reliable lapping of the fine grids 121 and the main grid 11 is further ensured.

A second embodiment of the present invention relates to a solar cell, including: the battery comprises a battery body and the electrode structure, wherein the electrode structure is arranged on the surface of the battery body.

Moreover, it can be understood by those skilled in the art that the present embodiment can achieve similar technical effects as the first embodiment, and the technical details in the first embodiment are still applicable to the present embodiment, and are not described herein again.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims

1. An electrode structure applied to a solar cell, comprising: the grid structure comprises a plurality of main grids extending along the first direction and arranged along the second direction, and a plurality of groups of auxiliary grids arranged along the second direction, wherein each group of auxiliary grids comprises a plurality of thin grids extending along the second direction and arranged along the first direction, and the thin grids in any two adjacent groups of auxiliary grids are distributed in a staggered manner and connected through the same main grid;

in the second direction, the fine grids in two adjacent groups of sub-grids are arranged at intervals.

2. The electrode structure of claim 1, wherein the fine grids in two adjacent sets of sub-grids are spaced apart by less than 1mm in the second direction.

3. The electrode structure according to claim 1, wherein the fine grids in the two sets of sub-grids adjacent to any one set of sub-grids are aligned in the first direction in a one-to-one correspondence.

4. The electrode structure according to any one of claims 1 to 3, wherein the pitch of adjacent fine grids in two adjacent sets of sub-grids in the first direction is in a range of 1.0 mm to 1.8 mm.

5. The electrode structure of claim 1, wherein the fine grid in each group of sub-grids has a length in the range of 8 mm to 30 mm and a width in the range of 20 μm to 1.5 mm.

6. A solar cell, comprising: a cell body, and an electrode structure as claimed in any one of claims 1 to 5, the electrode structure being provided on a surface of the cell body.