CN110634967B - Front electrode of heterojunction battery and manufacturing method thereof - Google Patents
Front electrode of heterojunction battery and manufacturing method thereof Download PDFInfo
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- CN110634967B CN110634967B CN201810643800.3A CN201810643800A CN110634967B CN 110634967 B CN110634967 B CN 110634967B CN 201810643800 A CN201810643800 A CN 201810643800A CN 110634967 B CN110634967 B CN 110634967B
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- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- 238000007639 printing Methods 0.000 claims description 51
- 238000003466 welding Methods 0.000 abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F77/00—Constructional details of devices covered by this subclass
- H10F77/20—Electrodes
- H10F77/206—Electrodes for devices having potential barriers
- H10F77/211—Electrodes for devices having potential barriers for photovoltaic cells
- H10F77/215—Geometries of grid contacts
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- Connection Of Batteries Or Terminals (AREA)
Abstract
本发明提供了一种异质结电池的正面电极及其制造方法，正面电极包括印刷在电池表面的多条主栅线和多条副栅线，所述主栅线上方连接有导电连接线，所述导电连接线的宽度大于所述主栅线的宽度，每个所述主栅线和多个与其相交的副栅线共同形成一个与所述导电连接线下表面形状尺寸相同的连接区，每条所述副栅线包括位于所述连接区内的第一段和位于所述连接区外的第二段，所述第一段的厚度小于或等于所述主栅线的厚度。本发明避免了导电连接线在焊接时与主栅线电极之间的间隙过大，因此提升了导电连接线与主栅线之间的拉力，保证了两者连接的可靠性。
The invention provides a front electrode of a heterojunction battery and a manufacturing method thereof. The front electrode comprises a plurality of main grid lines and a plurality of sub grid lines printed on the surface of the battery, and conductive connecting lines are connected above the main grid lines. The width of the conductive connection lines is greater than the width of the main grid lines, each of the main grid lines and a plurality of sub-grid lines intersecting with the main grid lines together form a connection area with the same shape and size as the lower surface of the conductive connection lines, Each of the auxiliary gate lines includes a first segment located in the connection region and a second segment located outside the connection region, and the thickness of the first segment is less than or equal to the thickness of the bus line. The invention avoids that the gap between the conductive connecting wire and the main grid line electrode is too large during welding, thereby improving the tension between the conductive connecting wire and the main grid wire, and ensuring the reliability of the connection between the two.
Description
Technical Field
The invention relates to the field of batteries, in particular to a front electrode of a heterojunction battery and a manufacturing method thereof.
Background
The front electrode of the conventional heterojunction cell is usually printed with silver paste on the surface of the solar cell by adopting a screen printing mode and used as the front electrode of the cell, and the front electrode comprises a main grid line for being welded with a tin-coated copper strip and a plurality of auxiliary grid lines perpendicular to the main grid line. Currently, a front electrode is generally formed by two-time printing, as shown in fig. 1, only a plurality of parallel secondary grid lines are printed during the first printing, as shown in fig. 2, a second layer of secondary grid lines and a plurality of main grid lines perpendicular to the secondary grid lines are printed in a second-time printing pattern, the two layers of secondary grid lines are overlapped in an area, the thickness of the electrode is increased, and therefore the conductivity is enhanced. By adopting a secondary printing mode, the larger height-width ratio of the secondary grid line can be realized, so that the conductive capacity of the grid line is improved under the condition that the shading area of the light incident surface of the cell is not influenced. However, the main grid line is printed only once, the auxiliary grid line is printed twice, and the main grid line and the auxiliary grid line have thickness difference.
As shown in fig. 3, when the heterojunction battery uses the tin-coated copper strip for welding, in order to avoid welding deviation caused by positioning deviation during welding, the width of the tin-coated copper strip (conductive connection line) is generally slightly wider than the main grid line, taking the main grid line with the width of 0.8mm as an example, the width of the tin-coated copper strip is about 1.0mm, and since the thickness difference exists between the secondary printed secondary grid line and the main grid line, only two sides of the bottom surface of the tin-coated copper strip are connected with the secondary grid line during welding, and a gap exists between most of the area of the bottom surface of the copper strip and the main grid line (the gap size is the thickness difference between the main grid line and the secondary grid line), the tensile force between the tin-coated copper strip and the main grid line of the battery piece after welding is very easy to be too low, and the welding reliability cannot be ensured.
Disclosure of Invention
The invention provides a front electrode of a heterojunction battery, and aims to solve the problem that the connection reliability cannot be ensured due to too low tension between the conventional conductive connecting line and a main grid line.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: the front electrode of the heterojunction battery comprises a conductive connecting wire, a plurality of main grid lines and a plurality of auxiliary grid lines, wherein the main grid lines and the auxiliary grid lines are printed on the surface of the battery and are arranged in parallel; the conductive connecting line is arranged above each main grid line, the width of each conductive connecting line is larger than that of each main grid line, and the lower surface of each conductive connecting line is connected with the upper surface of each main grid line; each main grid line and a plurality of auxiliary grid lines intersected with the main grid line form a connecting area with the same shape and size as the lower surface of the conductive connecting line together, the conductive connecting line is fixed on the connecting area, each auxiliary grid line comprises a first section located in the connecting area and a second section located outside the connecting area, and the thickness of the first section is smaller than or equal to that of the main grid line.
According to the front electrode of the heterojunction battery provided by the invention, the thickness of the first section of the secondary grid line in the connection area is designed to be smaller than or equal to that of the main grid line, so that the phenomenon that the gap between the conductive connecting line and the main grid line electrode is too large during welding is avoided, the tensile force between the conductive connecting line and the main grid line is improved, and the connection reliability of the conductive connecting line and the main grid line is ensured.
In addition, the front electrode of the heterojunction cell according to the above embodiment of the invention may also have the following additional technical features:
according to an example of the invention, the width of the first section is greater than the width of the second section, and the thickness of the first section is less than the thickness of the second section.
According to one example of the invention, the first section is formed by at least two printed lines arranged on the surface of the battery in a side-by-side fit mode, and the second section is formed by at least two printed lines which are overlapped from bottom to top.
According to an example of the present invention, the thickness of the bus bar is equal to or greater than the first segment.
According to an example of the invention, each main grid line is formed by two layers of printed lines which are overlapped from bottom to top in sequence.
According to an example of the present invention, the bus bar includes a plurality of first printed lines arranged in parallel and a plurality of second printed lines arranged in parallel, and the first printed lines and the second printed lines are perpendicular.
According to an example of the present invention, the main gate line and the sub gate line are perpendicular to each other.
A second object of the present invention is to provide a method of manufacturing a front electrode of a heterojunction cell, comprising the steps of:
printing secondary grid lines, namely printing a plurality of mutually parallel secondary grid lines on the surface of the battery;
printing a layer of parallel main grid lines on the surface of the battery, wherein the main grid lines are intersected with the auxiliary grid lines;
each main grid line and a plurality of auxiliary grid lines intersected with the main grid line form a connecting area with the same shape and size as the lower surface of the conductive connecting line, each auxiliary grid line comprises a first section located in the connecting area and a second section located outside the connecting area, and the thickness of the first section is smaller than or equal to that of the main grid line.
According to an example of the present invention, the secondary grid line printing includes the steps of:
printing a first layer of secondary grid lines, namely printing a plurality of mutually parallel first layer of secondary grid lines on the surface of the battery;
printing a buffer layer, namely printing a buffer layer grid line beside a first section on each first layer of auxiliary grid line, wherein the buffer layer grid line is attached to the first section of the first layer of auxiliary grid line side by side;
and printing a second layer of secondary grid lines, and printing the second layer of secondary grid lines on the upper surface of the second section on each first layer of secondary grid line.
According to an example of the present invention, the bus bar printing further includes the steps of: and printing another layer of main grid lines on the upper surface of the printed main grid lines.
Advantages of the above additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a front first printed image of the background art;
FIG. 2 is a second printing of a background art front side;
fig. 3 is a schematic connection diagram of a bus bar and a conductive connection line in the prior art;
fig. 4 is a schematic connection diagram of a main gate line and a conductive connection line according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a main gate line according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a main gate line; 101. a first printing line; 102. a second printing line; 201. a first stage; 202. a second stage; 2. a secondary gate line; 3. and a conductive connecting line.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example one
The embodiment provides a front electrode of a heterojunction battery, which comprises a plurality of main grid lines 1 and a plurality of auxiliary grid lines 2 which are arranged in parallel and printed on the surface of a battery (not shown in the figure), wherein the main grid lines 1 and the auxiliary grid lines 2 are made of low-temperature silver paste, the main grid lines 1 and the auxiliary grid lines 2 are printed on the surface of a solar battery in a screen printing mode and used as electrodes of the battery, the main grid lines 1 are used for being welded with a conductive connecting line 3, the main grid lines are generally lines with the width of 0.5mm-1.5mm, the auxiliary grid lines 2 are also arranged on the surface of the solar battery and are intersected with the main grid lines 1, and the auxiliary grid lines 2 are generally lines with the width of 30um-80 um.
Each main gate line 1 and a plurality of sub-gate lines 2 of this embodiment intersect, so that the main gate line 1 and the sub-gate lines 2 are conductively connected, specifically, the main gate line 1 and the sub-gate lines 2 are perpendicular to each other, and the amount of low-temperature silver paste can be reduced while the conductive connection between the main gate line 1 and the sub-gate lines is ensured.
The conductive connecting wire 3 of the embodiment is specifically a tin-coated copper strip, the tin-coated copper strip is formed by coating a layer of tin-lead or other alloys on the surface of the copper strip, and electrodes of the solar cells are interconnected through welding. In actual production, in order to avoid welding offset caused by positioning deviation during welding, the width of the conductive connecting line 3 is usually slightly wider than that of the main grid line 1, the lower surface of the conductive connecting line 3 is welded with the upper surface of the main grid line 1, each main grid line and a plurality of auxiliary grid lines intersecting with the main grid line form a connecting area with the same size as the lower surface of the conductive connecting line 3, each auxiliary grid line 2 comprises a first section 201 located in the connecting area and a second section 202 located outside the connecting area, and the thickness of the first section 201 is smaller than or equal to that of the main grid line 1.
Specifically, there are various structural forms for making the thickness of the first segment 201 less than or equal to the thickness of the bus bar 1.
The first structural form is as follows: during printing, the width of the first segment 201 is designed to be larger than that of the second segment 202, and the thickness of the first segment 201 is smaller than or equal to that of the second segment 202, so that the connection stability of the main gate line 1 and the conductive connecting line 3 is ensured, and the conductive performance of the sub-gate line 2 can also be ensured.
Preferably, the first section 201 of the structure is formed by attaching two printed lines arranged on the surface of the battery side by side, and the second section 202 is formed by overlapping the two printed lines from bottom to top, so that the areas of the cross sections of the auxiliary grid lines 2 at any positions along the length direction of the auxiliary grid lines are the same, and stable conductivity is ensured. As shown in fig. 4, of course, in order to facilitate the installation of the conductive connection line 3, the first segment 201 of the finger of the present embodiment may be expanded toward the second segment 202, that is, the width of the connection region formed by the first segments 201 of the finger 2 and the main finger 1 is larger than the width of the conductive connection line 3.
The second form is: the thickness of the main grid line 1 is designed to be larger than or equal to that of the auxiliary grid line 2, the specific implementation mode is that each main grid line 1 is designed to be a structure formed by sequentially overlapping two layers of printing lines from bottom to top, in order to ensure the conductivity of the auxiliary grid line 2, the auxiliary grid line 2 is also designed to be a structure (not shown in the figure) formed by sequentially overlapping two layers of printing lines from bottom to top, and the thicknesses of each layer of main grid line 1 and each layer of auxiliary grid line 2 are preferably the same printing thickness. Of course, the amount of material used for the bus bar 1 is significantly greater than in the first configuration described above.
On the basis of the two schemes, the welding tension between the main grid line 1 and the conductive connecting line 3 can be improved by improving the structure of the main grid line 1, as shown in fig. 5, the main grid line 1 can be designed into a plurality of first printing lines 101 and a plurality of second printing lines 102 which are arranged in parallel, the first printing lines 101 and the second printing lines 102 are perpendicular to each other, when in specific printing, the main grid line area with the primary printing pattern on the front side is designed into a plurality of straight lines which are parallel to the direction of the auxiliary grid line 2, the main grid line area with the secondary printing pattern on the front side is designed into a plurality of straight lines which are perpendicular to the direction of the auxiliary grid line, and the primary printing pattern and the secondary printing pattern are overlapped to form a grid line structure.
Example two
The present embodiment provides a method for manufacturing a front electrode of a heterojunction battery based on the first embodiment, including the following steps:
printing secondary grid lines, namely printing a plurality of secondary grid lines 2 which are parallel to each other on the surface of the battery;
printing a main grid line, namely printing a layer of a plurality of mutually parallel main grid lines 1 on the surface of a battery, wherein the main grid lines 1 are intersected with the auxiliary grid lines 2;
each main grid line 1 and a plurality of auxiliary grid lines 2 intersected with the main grid line 1 jointly form a connecting area with the same shape and size as the lower surface of the conductive connecting line, each auxiliary grid line 2 comprises a first section 201 located in the connecting area and a second section located outside the connecting area, and the thickness of the first section 201 is smaller than or equal to that of the main grid line 1.
Specifically, there are various manufacturing methods for making the thickness of the first segment 201 less than or equal to the thickness of the bus bar 1:
for example, the manufacturing manner of the finger 2 may be improved, and the finger printing of this embodiment includes the following steps:
printing a first layer of secondary grid lines, namely printing a plurality of mutually parallel first layer of secondary grid lines on the surface of the battery;
printing a buffer layer, namely printing a buffer layer grid line beside a first section on each first layer of auxiliary grid line, wherein the buffer layer grid line is attached to the first section of the first layer of auxiliary grid line side by side;
and printing a second layer of secondary grid lines, and printing the second layer of secondary grid lines on the upper surface of the second section on each first layer of secondary grid line.
According to the method, the first section 201 is formed by attaching two printing lines arranged on the surface of the battery side by side, the second section 202 is formed by overlapping the two printing lines from bottom to top, the structure ensures that the areas of any cross sections of the secondary grid lines 2 are the same, stable conductive performance is ensured, and overlarge gaps between the conductive connecting lines and the main grid line electrodes are avoided, so that the tensile force between the conductive connecting lines and the main grid lines is improved, and the connection reliability of the conductive connecting lines and the main grid lines is ensured.
For example, the manufacturing method of the main gate line 1 may be improved, and another layer of main gate line is printed on the upper surface of the printed main gate line, so that the thickness of the main gate line 1 is not less than that of the auxiliary gate line 2. In order to ensure the conductivity of the secondary grid line 2, the secondary grid line 2 is also designed to be a structure formed by sequentially overlapping two layers of printing lines from bottom to top, and the thickness of each layer of the main grid line 1 and the secondary grid line 2 is preferably the same printing thickness. Of course, the amount of the material used for the main grid line 1 is significantly larger than that in the above-mentioned manufacturing method.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
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| CN201810643800.3A CN110634967B (en) | 2018-06-21 | 2018-06-21 | Front electrode of heterojunction battery and manufacturing method thereof |
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| CN201810643800.3A CN110634967B (en) | 2018-06-21 | 2018-06-21 | Front electrode of heterojunction battery and manufacturing method thereof |
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| CN110634967B true CN110634967B (en) | 2021-08-10 |
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