TW201700304A - Designable type printing stencil structure of positive silver electrode for solar cell capable of making positive silver electrode thinner and maintaining the integrity of the printed graph without generating breakage or uneven paste - Google Patents

Abstract

This invention relates to a designable type printing stencil structure of positive silver electrode for solar cell, which comprises a flat metal film screen disposed thereon with evenly distributed material through holes and defining bus material falling areas of the positive silver electrode for solar cell and finger electrode material falling areas of the positive silver electrode for solar cell disposed with hollows, and a graph film layer located below the flat metal film screen and disposed thereon with hollow material falling area graph of the finger electrode and bus electrode of the positive silver electrode for solar cell. The material falling area can be designed as fully opened type material falling area without blockage and can also be disposed with bridging structure with regional support.

Description

Solar cell positive silver electrode designable printing steel plate structure

The invention relates to a printing steel plate structure, in particular to a printing steel plate design for single-time printing of a positive electrode of a solar cell or a double- or double-set solar positive silver electrode printing steel plate design according to a process design.

At present, the solar cell positive silver electrode printing mode is divided into single printing, double printing, and double printing. The printing method described above is formed by using a steel mesh as a screen for supporting the carrier, when the solar printed finger electrode tends to be narrower in line width (<50 um), and because the steel mesh is used as a supporting carrier. Relationship, the graphic layer must be formed on the wire support carrier, so it is also blocked in the blanking area of the finger electrode, resulting in a decrease in the opening ratio of the finger electrode. In the actual screen printing finger electrode blanking area, the wire mesh The yarn diameter causes a barrier to the slurry, and further causes doubts such as disconnection when the finger electrode for printing the ultra-fine wire diameter is formed. The use of double-layer printing must obtain better and more accurate double-layer printing set precision in the production and design of the screen. Therefore, in actual screen printing, the alignment accuracy is not accurate enough, and the life of the screen is insufficient. The cause of failure.

Therefore, by using the steel mesh as the screen printing structure of the supporting carrier, whether it is a single printing structure design, a double-layer printing structure design, or a double-set printing structure design, the dilemma of being unable to perform thin line width printing is encountered. Shangshi Relatively difficult.

Therefore, the use of steel-free wire as the support carrier for stencil printing will be an important printing stencil for the thinness of the solar finger electrode. The stencil printing is applied to the solar cell positive silver electrode printing mode, mainly used in the following ways: (A Double-layer printing: double-layer printing is a complete set of steel plate and screen version. The one screen is set to print the complete finger electrode blanking area and the electrode blanking area structure of the bus bar. The two steel plates are designed for Part of the blanking area of the finger electrode is printed; (B) Double-set printing: the double-set printing is also a complete version of the steel plate and the screen plate, and one steel plate is set to print the complete finger electrode blanking area structure or segmented type The finger electrode blanking zone structure is designed such that the two screens are designed for the electrodes of the busbar blanking zone or the finger electrode blanking zone structure with the compensation block design.

Therefore, the steel plate printing must use two screens to piece together the structure of the complete solar electrode, and it is impossible to complete the solar cell positive silver electrode printing in a single printing.

Therefore, in order to solve the conventional disadvantages, the present invention does not use a wire support carrier, but instead uses a metal film to form a self-designed pattern. As a one-time solar positive silver battery printing steel plate, a finger electrode is placed on the metal film. At the same time, the busbar blanking area is also set up. The blanking area can be designed according to various types of customized product design and structural maintenance. The fingering electrode blanking area and the busbar blanking area are also set. The steel plate structure of the zone is applied to a solar positive silver electrode pattern formed by one printing.

In order to achieve the above object, the present invention discloses a solar cell positive silver electrode which can be a single-layer, double-layer or double-printed steel plate structure, which comprises a metal planar film network with uniformly distributed through-holes, and the metal a flat film web defines a busbar blanking zone of a positive electrode of a solar cell, and a finger electrode blanking zone of a positive silver electrode of a solar cell provided with a hollow; and a patterned film layer is located below the planar metal film mesh, and The graphic film layer is provided with a finger electrode of a hollow solar cell positive silver electrode and a blanking area pattern of the bus bar electrode.

Further, the finger-shaped electrode blanking area of the metal planar film network is provided with a bridging structure pattern of the metal planar film network structure, and the corresponding side edges of each of the finger electrode blanking regions are connected.

Wherein, the bridge structure pattern is disposed in a middle portion of the metal planar film network finger electrode blanking area, or the bridge structure pattern is disposed in the entire area of the metal planar film network finger electrode blanking area; the bridge structure graphic is One of the linear shape, the perforation structure of the metal planar film web, and the structural pattern composed of the hollow portion.

Wherein, the busbar blanking area of the metal planar film network is provided with a bridging structure pattern of the metal planar film mesh structure, and is connected to the side of the busbar blanking area; the bridging structure graphic is composed of a hollow portion Structure graphics.

The invention has the advantages that the steel wire support carrier is not used, and the metal flat film mesh is used to form the self-designed pattern. As a disposable solar cell positive silver electrode printing steel plate, a metal electrode film network can be provided with a finger electrode drop. In the material area, the unopened full-opening blanking area is designed in the blanking area, and the bridging structure with regional support can also be provided. At the same time, the busbar blanking area is also set, and the blanking area can be Each type of customized product design and structure maintains the design of the blanking area structure of the diversity, and the steel plate structure of the finger electrode blanking area and the busbar blanking area is applied to the solar positive silver electrode pattern of one printing and forming. , or according to the process design, double or double sets of solar positive silver steel plate design.

The invention replaces the conventional steel mesh with a more supportive metal planar membrane network to solve the problem that the slurry is blocked by the mesh diameter and cannot uniformly penetrate the ink due to the mesh structure, and the regional support is provided in the blanking area. The bridging structure is used to support the blanking area. When the scraper is brushed, it can avoid deformation of the blanking zone due to stress pulling, control the thickness of the positive silver electrode slurry, make the positive silver electrode thinner and maintain the integrity of the printed image. In addition to problems such as wire breakage and uneven slurry, it is possible to save costs and improve conversion efficiency.

100‧‧‧Metal flat film net

101‧‧‧through hole

110‧‧‧ Busbar blanking area

111, 121‧‧‧ Bridge structure graphics

120‧‧‧ finger electrode blanking area

200‧‧‧graphic film layer

210‧‧‧ Busbar blanking area graphics

220‧‧‧ finger electrode blanking area graphic

300‧‧‧ frame

400‧‧‧ scraper

Figure 1 is an exploded perspective view of the printed steel plate structure of the present invention.

2 is a schematic cross-sectional view of a printed steel plate structure of the present invention.

3 to 7 are schematic views showing a structure of a bridge structure in the middle of the finger electrode of the present invention.

8 to 12 are schematic views showing all of the bridge structure patterns of the finger electrodes of the present invention.

Figure 13 is a schematic view showing a structure of a bridge structure of a bus bar electrode of the present invention.

With regard to the details and technical description of the present invention, the present embodiment is now It is to be understood that the embodiments are merely illustrative and are not to be construed as limiting.

Please refer to FIG. 1 and FIG. 2 , which are respectively an exploded schematic view and a cross-sectional view of the printed steel plate structure of the present invention. The present invention discloses a solar cell positive silver electrode single-, double-, double-set printing steel plate structure, which comprises a metal planar film web 100 with uniformly distributed through-holes 101, and the metal planar film network 100 defines a busbar blanking area 110 of a solar cell positive silver electrode, and a finger electrode blanking zone 120 provided with a hollow solar cell positive silver electrode; the metal planar film web 100 is stretched and fixed to one In the frame 300, the aperture of the through-hole 101 depends on the resolution and quality requirements, and processes in the prior art can be used (for example, by laser drilling, wet etching, ultrasonic etching, etching or drilling). The shape of the through-hole 101 may be a square shape (as illustrated in the embodiment) that is arranged in different directions but is arranged in a circle, a rectangle, a hexagon, a hexagon, or the like.

A patterned film layer 200 is disposed under the metal planar film web 100, and the patterned film layer 200 is provided with a busbar blanking area pattern 210 and a finger electrode blanking area pattern 220 of hollowed-out solar cell positive silver electrodes. The patterned film layer 200 may be formed under the metal planar film web 100 by electroplating or by a polymer material.

For implementation, a printed substrate (not shown) is disposed under the patterned film layer 200, and a positive silver electrode paste (not shown) is transmitted through the metal planar film web 100 by a doctor blade 400. The through-hole 101 of the busbar blanking area 110 and the hollowed-out finger-shaped electrode blanking zone 120 are uniformly blanked to form a positive electrode pattern of the solar cell.

Moreover, the electrode structure of the solar cell generally consists of two lines and five line widths. Wide busbar electrode, and dozens of fingers with narrow line widths, when the solar-printed finger electrode tends to be narrower (#50um), because the finger electrode is wide The finer the better, the higher the slurry height must be, the higher the solar conversion rate can be obtained. Therefore, the finger electrode blanking area 120 of the solar cell positive silver electrode of the aforementioned hollow design may be deformed and warped when the slurry is printed because it is too long, which affects the printing quality.

Therefore, the finger electrode blanking area 120 of the metal planar film web 100 is provided with a bridging structure pattern 121 of the metal planar film web 100 structure, and the corresponding side of each finger electrode blanking area 120 is connected, wherein The bridge structure pattern 121 is disposed in a middle portion of the finger-shaped electrode blanking area 120 of the metal planar film network 100. As shown in FIG. 3 to FIG. 7, the bridge structure pattern 121 is linear (as shown in FIG. 5). The structure of the through-hole 101 of the metal planar film web 100 (as shown in FIGS. 3 and 4) and the structural pattern (shown in FIGS. 6 and 7) having a hollow portion.

Or the bridge structure pattern 121 is disposed in the entire area of the finger-shaped electrode blanking area 120 of the metal planar film network 100; as shown in FIG. 8 to FIG. 12, the bridge structure pattern 121 is linear (see FIGS. 8 and 9). Shown), the through-hole structure of the metal planar film web (as shown in FIG. 10), and one of the structural patterns (shown in FIGS. 11 and 12) having a hollow portion.

In the application, the bridge structure pattern 121 may be formed by two or more graphic structures, and may be a line, a graphic, a polygonal shape, a mesh surface of different density, or a hollow design, all within the scope of the design.

The same application, except for the uniform distribution of the original metal planar film web 100 In addition to the hole 101, the busbar blanking area 110 of the metal planar film web 100 may also be provided with a bridging structure pattern 111 of the metal planar film web 100 structure, which is connected to the side of the busbar blanking area 110; The bridge structure pattern 111 is a structural pattern composed of a hollow portion, as shown in FIG.

The invention is characterized in that instead of using the steel wire support carrier, the metal flat film net 100 is formed into a self-designed pattern, and as a disposable solar cell positive silver electrode printing steel plate, the finger-shaped electrode is disposed on the metal flat film net 100. In the material area 120, the unopened full-opening blanking area is designed in the blanking area, and the bridging structure pattern 121 structure with regional support can also be arranged, and the busbar blanking area 110 is also set, and the blanking area can be according to various types. The customized product design and structure maintain the diversity of the blanking area structure design, and the steel plate structure of the finger electrode blanking area and the busbar blanking area is applied to the solar positive silver electrode pattern of one printing and forming. Moreover, the finger electrode blanking area 120 and the busbar blanking area 110 on the metal planar film web 100 belong to the same layer structure, but one or two or more bridging structure patterns 121 form the structure, and the design is The planar bridge structure pattern 121 is not arranged with the limitation of size and density, and all the graphic structures can be applied to the finger electrode blanking area 120 and the busbar blanking area 110, or even the two blanking pattern areas. The outer region is used to reinforce the structure of the metal planar film web 100.

The invention replaces the conventional steel mesh with a more supportive metal planar membrane network to solve the problem that the slurry is blocked by the mesh diameter and cannot uniformly penetrate the ink due to the mesh structure, and the regional support is provided in the blanking area. The bridge structure is used to support the blanking area. When the scraper is brushed, it can avoid deformation of the blanking area due to stress pulling. The positive silver electrode paste thickness makes the positive silver electrode thinner and maintains the integrity of the printed image, and does not cause problems such as disconnection and unevenness of the slurry, thereby saving cost and improving conversion efficiency.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100‧‧‧Metal flat film net

101‧‧‧through hole

110‧‧‧ Busbar blanking area

120‧‧‧ finger electrode blanking area

200‧‧‧graphic film layer

210‧‧‧ Busbar blanking area graphics

220‧‧‧ finger electrode blanking area graphic

300‧‧‧ frame

Claims (7)

A solar cell positive silver electrode designable printing steel plate structure, comprising: a metal planar film net, the metal flat film net is provided with a uniformly distributed through hole, and the metal flat film network defines a solar cell positive a bus electrode blanking area of the silver electrode, and a finger electrode blanking area provided with a hollow solar cell positive silver electrode; and a graphic film layer, the graphic film layer being located under the metal planar film net, and the graphic film layer There is a finger-shaped electrode of the solar cell positive silver electrode and a blanking area pattern of the bus bar electrode. The solar cell positive silver electrode designable printing steel plate structure according to claim 1, wherein the finger blanking area of the metal planar film network is provided with a bridge of the same metal planar film network structure. The structural pattern connects the corresponding sides of the blanking area of each finger electrode. The solar cell positive silver electrode designable printing steel plate structure according to claim 2, wherein the bridge structure pattern is disposed in a middle portion of the metal planar film mesh finger electrode blanking area. The solar cell positive silver electrode designable printing steel plate structure according to claim 2, wherein the bridge structure pattern is disposed in all areas of the metal planar film mesh finger electrode blanking area. The solar cell positive silver electrode designable printing steel plate structure according to claim 1, wherein the bridge structure pattern is a linear, metal planar film mesh through-hole structure, and a structure having a hollow portion. One of the graphics. The solar cell positive silver electrode designable printing steel plate structure according to the first aspect of the invention, wherein the busbar blanking area of the metal planar film network is provided with a bridge structure of the same metal planar film mesh structure. Graphics, connection bus blanking The side of the area. The solar cell positive silver electrode designable printing steel plate structure according to claim 6, wherein the bridge structure pattern is a structural pattern composed of a hollow portion.