TWI616347B - Printed steel plate structure for battery positive silver electrode printing - Google Patents

Abstract

The invention relates to a printing steel plate structure for battery positive silver electrode printing, which comprises a planar film mesh and a graphic film layer. Wherein, the planar film web is provided with a uniformly distributed through-hole, a busbar blanking zone defining a positive silver electrode of the solar cell, and a finger-shaped electrode blanking zone provided with a hollowed-out solar cell positive silver electrode, characterized in that The longitudinal cross-sectional shape of the through-hole is a square, circular, trapezoidal, regular polygonal or stepped shape with rounded corners.

Description

Printed steel plate structure for battery positive silver electrode printing

The present invention relates to a printed steel plate structure, and more particularly to a printed steel plate design structure for use in a single printing of a positive silver electrode on a solar cell.

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.

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. It is relatively difficult.

Therefore, in order to solve the conventional disadvantages, the present invention uses a metal film to form a self-designed pattern, and is used as a one-time solar positive silver battery printing steel plate. A metal electrode blanking area is disposed on the metal film, and a bus bar is also disposed. The material area and the blanking area can be designed according to various types of customized product design and structural maintenance. The steel plate structure of the finger electrode blanking area and the busbar blanking area is matched with different shapes. The through hole is applied to the pattern of the solar positive silver electrode formed by one printing.

To achieve the above object, the present invention discloses a steel plate structure for positive electrode printing of a solar cell, which may be a single, double or double-printed steel plate structure. The stencil structure comprises a uniformly distributed through-hole on a planar film web, and the cross-sectional shape of the through-hole can be square, circular, polygonal, trapezoidal or stepped with rounded corners. The planar film network defines a busbar blanking area of the positive electrode of the solar cell, and a finger electrode blanking zone of the positive silver electrode of the solar cell; and a patterned film layer is located below the planar 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. Through the characteristics of different through-holes to control the blanking process to be achieved, different cross-section shapes will affect the movement of the slurry during the blanking process, so that the printed results are closer to the preset range, greatly improving the printing efficiency.

Further, the finger electrode blanking area of the planar film web is provided with a bridging structure pattern of the same planar film net structure, and the corresponding side edges of each finger electrode blanking area are connected.

Wherein, the bridge structure pattern is disposed in a middle section of the blanking area of the finger electrode of the planar film network, or the bridge structure pattern is disposed in all areas of the blanking area of the finger electrode of the planar film network; the bridge structure pattern is linear One of the through-hole structure of the planar membrane network and the structural pattern composed of the hollow portion.

Wherein, the busbar blanking area of the planar film web is provided with a bridging structure pattern of the same planar film net structure, and is connected to the side of the confluent blanking area; the bridging structure graphic is a structural figure composed of a hollowed out part .

The invention has the advantages that the wire support carrier is not used, and the flat film mesh is used to form the self-designed pattern. As a disposable solar cell positive silver electrode printing steel plate, a finger electrode web can be provided with a finger electrode blanking area. In the blanking area, the unopened full-opening blanking area can be designed, and the bridging structure with regional support can also be provided. At the same time, the busbar blanking area is also set. The blanking area can be designed and constructed according to various types of customized products. Maintain the diversity of the blanking area structure design, and set the steel plate structure of the finger electrode blanking area and the busbar blanking area to be applied to the solar positive silver electrode pattern of one printing, or double or according to the process design. Double sets of solar positive silver plate printing.

The invention replaces the conventional steel mesh with a more supportive planar membrane network to solve the problem that the slurry is blocked by the mesh diameter and cannot uniformly permeate the ink due to the mesh structure, and the regional support is set in the blanking area. The 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 can save costs and improve conversion. effectiveness.

100‧‧‧Flat membrane network

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.

14 to 18 are schematic views showing the longitudinal sectional shape of the through hole of the present invention.

The detailed description of the present invention and the technical description of the present invention are further illustrated by the embodiments, but it should be understood that these embodiments are for illustrative purposes only 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 invention discloses a steel plate structure for positive electrode printing of solar cells, which is a printing steel plate structure which can be applied to single, double and double sets.

In this embodiment, a planar film web 100 is uniformly distributed. a hole 101, and a busbar blanking area 110 of a solar cell positive silver electrode is defined on the planar film web 100, and a finger electrode blanking zone 120 is provided with a hollow solar cell positive silver electrode; The mask web 100 is stretched and fixed in a frame 300. The aperture of the through hole 101 depends on the resolution and quality requirements. The prior art process can be used (for example, by laser drilling, wet etching). , ultrasonic etching, etching or drilling), and the shape of the perforating hole 101 can be a square shape in different directions but successively arranged (as shown in Fig. 14), or a circular shape (Fig. 15), a regular polygon (Fig. 16). A pattern arranged in a trapezoidal shape (Fig. 17) or a stepped shape (Fig. 18).

The patterned film layer 200 is located below the planar film web 100, and the patterned film layer 200 is provided with a bus bar 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 planar film web 100 by electroplating or by a polymer material.

In the 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 flat film web 100 by a doctor blade 400. The through-holes 101 of the discharge zone 110 and the hollowed-out finger-shaped electrode blanking zone 120 are uniformly blanked to form a positive electrode pattern of the solar cell. Wherein, the planar film web 100 is made of a metal material and passes through the differently shaped through-holes 101 to achieve different thicknesses or widths under the same process.

In addition, the finger electrode blanking area 120 of the planar film web 100 is provided with a bridging structure pattern 121 of the same planar film web 100 structure, and the side edges corresponding to each of the finger electrode blanking areas 120 are connected, wherein the bridging structure The pattern 121 is disposed in the middle of the finger-film deposition area 120 of the planar film web 100. As shown in FIG. 3 to FIG. 7, the bridge structure pattern 121 The structure is linear (as shown in FIG. 5), the structure of the through-hole 101 of the planar film web 100 (as shown in FIG. 3 and FIG. 4), and the structural pattern composed of the hollow portion (as shown in FIGS. 6 and 7). one of them.

The bridge structure pattern 121 can also be disposed in the entire area of the finger electrode blanking area 120 of the planar film web 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 planar film web (as shown in Figure 10), and one of the structural patterns (shown in Figures 11 and 12) having a hollow portion.

In the application, the bridge structure pattern 121 may also be formed by two or more graphic structures, which may be lines, figures, polygons, mesh surfaces of different densities or hollow designs, all of which are within the scope of protection of the present case.

Furthermore, in addition to the through-hole 101 which is evenly distributed in the original planar film web 100, the busbar blanking area 110 of the planar film web 100 can also be provided with the bridging structure pattern 111 of the same planar film web 100 structure, and the connection confluence The side of the blanking area 110; the bridging structure pattern 111 is a structural figure composed of a hollow portion, as shown in FIG.

In addition, as shown in FIG. 14 to FIG. 18, the cross-sectional shape of the through-hole 101 of the planar film web 100 may be a square 101A with a rounded corner (four corners), a circle 101B, and a polygon. 101C (octagonal shape as shown), trapezoidal 101D or stepped 101E. Through these designs to control the blanking process to be achieved, different cross-section shapes will affect the movement of the slurry during the blanking process, so that the printed results are closer to the preset range, greatly improving the printing efficiency. This is a feature of the present invention.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the scope of patent application according to the present invention. And the simple equivalent changes and modifications made by the description of the invention are still within the scope of the invention.

Claims (7)

A printing steel plate structure for battery positive silver electrode printing, comprising: a planar film net, which is made of a metal material, wherein the flat film web is provided with uniformly distributed through holes, wherein the longitudinal cross-sectional shapes of the through holes Forming a square, circular, regular polygon or stepped shape with rounded corners, and the planar film network defines a busbar blanking area of the positive electrode of the solar cell, and a finger of a positive silver electrode of the solar cell provided with a hollowed out An electrode blanking zone; and a patterned film layer, the patterned film layer is located under the planar film web, and the patterned 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 . The printing steel plate structure for battery positive silver electrode printing according to claim 1, wherein the finger-shaped electrode blanking area of the planar film network is provided with a bridge structure pattern of the same planar film network structure. , connecting the corresponding side of each finger electrode blanking area. The printing steel plate structure for battery positive silver electrode printing according to claim 2, wherein the bridge structure pattern is disposed in a middle portion of the planar film mesh finger electrode blanking area. The printing steel plate structure for battery positive silver electrode printing according to the second aspect of the invention, wherein the bridge structure pattern is disposed in the entire area of the blanking area of the finger electrode of the planar film network. The printing steel plate structure for battery positive silver electrode printing according to claim 1, wherein the bridge structure pattern is a linear shape, a transparent film structure of a planar film mesh, and a structural pattern composed of a hollow portion. one of them. Printing steel for battery positive silver electrode printing as described in claim 1 The layout structure, wherein the busbar blanking area of the planar film web is further provided with a bridging structure pattern of the same planar membrane network structure, and is connected to the side of the blanking area of the busbar. The printed steel plate structure for battery positive silver electrode printing according to claim 6, wherein the bridge structure pattern is a structural pattern composed of a hollow portion.