CN113035998A - Silk-screen printing mode for positive and negative electrode points of MWT battery - Google Patents
Silk-screen printing mode for positive and negative electrode points of MWT battery Download PDFInfo
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- CN113035998A CN113035998A CN202110170861.4A CN202110170861A CN113035998A CN 113035998 A CN113035998 A CN 113035998A CN 202110170861 A CN202110170861 A CN 202110170861A CN 113035998 A CN113035998 A CN 113035998A
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- printing
- negative electrode
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- 238000007650 screen-printing Methods 0.000 title claims abstract description 17
- 238000007639 printing Methods 0.000 claims abstract description 60
- 239000002002 slurry Substances 0.000 claims abstract description 34
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000005684 electric field Effects 0.000 claims abstract description 10
- 229910052709 silver Inorganic materials 0.000 claims abstract description 9
- 239000004332 silver Substances 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
- H01L31/02245—Electrode arrangements specially adapted for back-contact solar cells for metallisation wrap-through [MWT] type solar cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a silk-screen printing mode for positive and negative electrode points of an MWT battery, which comprises the following steps: firstly, printing a negative electrode point, and filling hole plugging slurry into the negative electrode point, wherein the diameter of the hole plugging slurry of the negative electrode point is just required to ensure that a hole can be covered during printing; simultaneously printing the positions of the anode and cathode points, wherein the printing diameter of the cathode point is the same as that of the cathode point in the current printing mode, and the height of the sintered anode is not lower than that of the sintered anode in the current printing mode; step three, printing a back electric field, and printing the back electric field by using back aluminum paste; and step four, printing a front electrode, and printing a front silver paste on the front side of the battery. According to the invention, by changing the printing mode and the slurry, the cost of a part of slurry can be reduced; and the additional benefit is that the pits of the plugging hole are filled up, so that the assembly is more reliable.
Description
Technical Field
The invention relates to the technical field of solar cell photovoltaics, in particular to a screen printing mode for positive and negative electrode points of an MWT cell.
Background
The existing MWT battery has the structural characteristics (as shown in fig. 1) that 6 × 6 holes are uniformly distributed on the battery piece, hole plugging slurry is filled in the holes, and the front-side current is collected and then conducted to the back-side negative electrode point through the hole plugging slurry. The negative electrode point is isolated from the back surface electric field, so that the positive electrode and the negative electrode of the battery are insulated. The positive and negative electrode points are combined with the conductive adhesive when the assembly is manufactured.
At present, the screen printing sequence is that firstly, negative electrode points (pore blocking slurry) → positive poles (back silver slurry) → back electric field (back aluminum slurry) → front electrodes (front silver slurry);
the cathode point is high, typically around 25um, while the anode point is high around 5 um. 5um can ensure the electrode point and the conductive adhesive to be fully combined, but because the hole needs to be fully filled, the cathode point cannot be too thin, the too thin hole is not fully filled, and the current transmission can be influenced. In addition, when the assembly is manufactured, the diameter of the cathode point cannot be too small in consideration of manufacturing precision, the diameter of the cathode point is 2mm in the current printing mode, otherwise, the cathode point and the conductive adhesive are easy to misplace and do not contact, the performance of the assembly is affected, and poor EL is generated. Due to the requirements of thickness and diameter, the usage amount of the slurry of the cathode point is relatively high, and the unit price of the hole plugging slurry used by the cathode point is higher, so the corresponding cost is also higher.
Because the holes are filled when the cathode dots are printed, a small pit (as shown in fig. 1) is formed in the middle of the cathode dots, and the pit usually has no influence on the reliability of the assembly. But it is not excluded that in some extreme cases, this pit affects the connection of the negative electrode point to the conductive paste.
Disclosure of Invention
The invention aims to provide a positive and negative electrode point screen printing mode of an MWT battery, which can reduce the cost of part of slurry by changing the printing mode and the slurry; and the additional benefit is that the pits of the plugging hole are filled up, so that the assembly is more reliable.
The invention relates to a screen printing method for positive and negative electrode points of an MWT battery, which comprises the following steps:
firstly, printing a negative electrode point, and filling hole plugging slurry into the negative electrode point, wherein the diameter of the hole plugging slurry of the negative electrode point is just required to ensure that a hole can be covered during printing;
simultaneously printing the positions of the anode and cathode points, wherein the printing diameter of the cathode point is the same as that of the cathode point in the current printing mode, and the height of the sintered anode is not lower than that of the sintered anode in the current printing mode;
step three, printing a back electric field, and printing the back electric field by using back aluminum paste;
and step four, printing a front electrode, and printing a front silver paste on the front side of the battery.
Further, the first step and the second step are carried out in sequence, and the slurry is hole plugging slurry.
As a preferable scheme of the present application, the printing diameter of the pore blocking paste of the cathode dot in the step one is 0.8 mm.
As a preferred scheme of the application, the height of the positive electrode point after sintering is 8 um.
As a preferred scheme of this application, the stifled hole thick liquids are the electrically conductive silver thick liquids that have characteristics such as weak corrosivity, high tensile, high conductivity.
The beneficial effects of the invention include:
this application compares current mode through changing printing mode and thick liquids, and the main advantage has reduced silver thick liquid consumption, synthesizes and calculates, and monolithic reduce cost is about 0.06 yuan, and simultaneously, negative pole point position printing is twice, has filled up the pit that once printing can produce, has improved the subassembly reliability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the present invention will be briefly described below, and it is apparent 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 that other drawings can be obtained based on these drawings without inventive labor.
FIG. 1 is a schematic diagram of a battery junction structure formed by screen printing in the prior art;
fig. 2 is a schematic diagram of a battery manufactured by the screen printing method of positive and negative electrode points of an MWT battery of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, the present invention is a screen printing method for positive and negative electrode points of MWT battery, the method includes the following steps:
firstly, printing a negative electrode point, and filling hole plugging slurry into the negative electrode point, wherein the diameter of the hole plugging slurry of the negative electrode point is smaller than that of the negative electrode point in the existing printing mode, the diameter of the negative electrode point in the existing printing mode is 2 microns, and the printing height is equivalent to that of the negative electrode point in the existing printing mode;
simultaneously printing the positions of the anode and cathode points, wherein the printing diameter of the cathode point is the same as that of the cathode point in the current printing mode, and the height of the sintered anode is not lower than that of the sintered anode in the current printing mode;
step three, printing a back electric field, and printing the back electric field by using back aluminum paste;
and step four, printing a front electrode, and printing a front silver paste on the front side of the battery.
Further, the first step and the second step are carried out in sequence, and the slurry is hole plugging slurry.
As a preferable scheme of the present application, the printing diameter of the pore blocking paste of the negative electrode point in the step one is 0.8 mm.
As a preferred scheme of the application, the height of the positive electrode point after sintering is 8 um.
As an optimal scheme of this application, the stifled hole thick liquids are the electrically conductive silver thick liquids of characteristics such as stifled hole thick liquids have weak corrosivity, high tensile, high conductivity, and the brand of adoption has dupont or sky flourishing.
In the first step, negative electrode points are printed, and in the second step, the positive electrode points and the negative electrode points are printed at the same time, so that 2 layers of negative electrode points exist, and the printing is carried out for 2 times. And step one and step two are both printed by using the pore-plugging slurry. The diameter of the negative electrode point printed in the first step is 0.8mm, and the diameter of the negative electrode point printed in the second step is 2 mm. Step one, 0.8mm, is for saving slurry, step two, 2mm for printing is for making the cathode point large enough, and 2 times of printing can fill the pit. And in the second step, the height of the positive pole after sintering is only 8 um.
The thickness of the hole plugging slurry printed in the step one is not changed, and the diameter is reduced to ensure that the hole can be covered when printing is carried out, so that the consumption of the slurry can be greatly reduced; the middle pit still exists, and the size and the depth are basically unchanged;
step two, the original first screen printing plate graph and the original second screen printing plate graph are combined, namely, the anode and cathode points are printed at the same time; the slurry adopts plugging slurry; and (3) adopting proper screen parameters to ensure that the height of the electrode printed in the second pass is not less than the height of the positive pole point. Therefore, the filling effect of the holes is ensured at the positions of the holes, meanwhile, the area is large enough, the connection with the conductive adhesive is ensured, and the using amount of the slurry is greatly reduced on the whole.
In this embodiment, the positive and negative electrode dots are printed with the following amounts of the pastes:
the diameter of the first printed cathode dot is reduced from 2mm to 0.8mm, and the printing height is consistent with that of the current printing mode; the diameter of the second printing cathode point is maintained to be 2 mm; the diameter of the second printing anode point is maintained to be 3 mm; the second printing positive pole has a height of 8um after sintering.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. A screen printing mode for positive and negative electrode points of an MWT battery is characterized by comprising the following steps:
firstly, printing a negative electrode point, and filling hole plugging slurry into the negative electrode point, wherein the diameter of the hole plugging slurry of the negative electrode point is ensured to cover a hole during printing;
simultaneously printing the positions of the anode and cathode points, wherein the printing diameter of the cathode point is the same as that of the cathode point in the current printing mode, and the height of the sintered anode is not lower than that of the sintered anode in the current printing mode;
step three, printing a back electric field, and printing the back electric field by using back aluminum paste;
and step four, printing a front electrode, and printing a front silver paste on the front side of the battery.
2. The screen printing method for positive and negative electrode points of MWT battery as claimed in claim 1, wherein said first and second steps are performed sequentially, and the slurry is a plugging slurry.
3. The screen printing method for positive and negative electrode points of MWT battery as claimed in claim 2, wherein in step one, the overflow diameter of the hole plugging slurry of the negative electrode point is 0.8 mm.
4. The screen printing method for positive and negative electrode points of MWT battery as claimed in claim 1, wherein the height of positive electrode point after sintering is 8 um.
5. The screen printing method for positive and negative electrode points of MWT battery as claimed in any one of claims 1 to 4, wherein said plugging hole paste is a conductive silver paste with weak corrosivity, high tensile force and high conductivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110170861.4A CN113035998A (en) | 2021-02-08 | 2021-02-08 | Silk-screen printing mode for positive and negative electrode points of MWT battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110170861.4A CN113035998A (en) | 2021-02-08 | 2021-02-08 | Silk-screen printing mode for positive and negative electrode points of MWT battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113035998A true CN113035998A (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110170861.4A Pending CN113035998A (en) | 2021-02-08 | 2021-02-08 | Silk-screen printing mode for positive and negative electrode points of MWT battery |
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| Country | Link |
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| CN (1) | CN113035998A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921659A (en) * | 2021-12-10 | 2022-01-11 | 南京日托光伏新能源有限公司 | Method for improving MWT hole hiding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090084437A1 (en) * | 2007-10-02 | 2009-04-02 | Sanyo Electric Co., Ltd. | Solar cell and method of manufacturing the same |
| US20100275987A1 (en) * | 2006-12-26 | 2010-11-04 | Kyocera Corporation | Solar Cell and Solar Cell Manufacturing Method |
| CN102529467A (en) * | 2010-12-02 | 2012-07-04 | 应用材料意大利有限公司 | Method for printing a substrate |
| CN104576820A (en) * | 2013-10-21 | 2015-04-29 | 应用材料意大利有限公司 | Method for producing a backside contact in a solar cell device and solar cell device |
| CN104701417A (en) * | 2015-03-10 | 2015-06-10 | 苏州阿特斯阳光电力科技有限公司 | Printing method for back-contact solar cell |
-
2021
- 2021-02-08 CN CN202110170861.4A patent/CN113035998A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100275987A1 (en) * | 2006-12-26 | 2010-11-04 | Kyocera Corporation | Solar Cell and Solar Cell Manufacturing Method |
| US20090084437A1 (en) * | 2007-10-02 | 2009-04-02 | Sanyo Electric Co., Ltd. | Solar cell and method of manufacturing the same |
| CN102529467A (en) * | 2010-12-02 | 2012-07-04 | 应用材料意大利有限公司 | Method for printing a substrate |
| CN104576820A (en) * | 2013-10-21 | 2015-04-29 | 应用材料意大利有限公司 | Method for producing a backside contact in a solar cell device and solar cell device |
| CN104701417A (en) * | 2015-03-10 | 2015-06-10 | 苏州阿特斯阳光电力科技有限公司 | Printing method for back-contact solar cell |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921659A (en) * | 2021-12-10 | 2022-01-11 | 南京日托光伏新能源有限公司 | Method for improving MWT hole hiding |
| CN113921659B (en) * | 2021-12-10 | 2022-06-28 | 南京日托光伏新能源有限公司 | Method for improving MWT hole hiding |
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Application publication date: 20210625 |
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| RJ01 | Rejection of invention patent application after publication |