CN210257610U

CN210257610U - Screen printing plate graph for printing conductive adhesive in tile-overlapping assembly, printing structure and assembly

Info

Publication number: CN210257610U
Application number: CN201920522257.1U
Authority: CN
Inventors: 王彪; 王建波; 吕俊; 朱琛; 仲春华; 申品文
Original assignee: Taizhou Lerri Solar Technology Co Ltd
Current assignee: Taizhou Longi Solar Technology Co Ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-04-07
Anticipated expiration: 2029-04-17

Abstract

The utility model provides a half tone figure and printing structure and subassembly for printing conducting resin in shingle assembly relates to the solar cell field for it is poor to solve back electrode and conducting resin contact nature, the problem that the conducting resin quantity is high. The conductive adhesive is printed in the area where the back electrode of the battery piece is located through the screen pattern, the screen pattern is provided with a plurality of discontinuous sectional areas, and each discontinuous sectional area is provided with a plurality of through holes. The beneficial effects are as follows: according to the method, the conductive adhesive is printed in the area where the back electrode is located through the screen printing plate pattern, so that the contact distance between two battery pieces in the laminated assembly is reduced, the contact performance between the two battery pieces is improved, and the possible reliability risk of the assembly is reduced; the possibility of water vapor intrusion is reduced, and the reliability risks of the components HF, DH and TC are also reduced; the present disclosure also reduces the scrap rate, improves the mechanical load performance of the assembly, and reduces the amount of conductive paste used.

Description

Screen printing plate graph for printing conductive adhesive in tile-overlapping assembly, printing structure and assembly

Technical Field

The disclosure relates to the field of solar modules, in particular to a screen printing plate graph and a printing structure for printing conductive adhesive in a tile-stacked module and a module.

Background

How to improve the output power and the reliability of a photovoltaic module is always the research focus of the photovoltaic industry, and at present, high-efficiency modules have different technical routes, namely, the improvement of the battery efficiency on one hand, and the improvement of the module technology on the other hand.

The conventional photovoltaic module is connected by connecting the whole battery strings by using solder strips to realize circuit connection. The connection method can cause gaps between the batteries and the battery plates, reduce the effective utilization area of the assembly, and simultaneously cause the internal current of the whole battery to be larger and the consumption inside the battery to be larger in the operation process of the assembly (I)²R), in order to reduce the loss inside the battery and increase the number of cells per unit area, a stack assembly technology has been developed.

The technique of the laminated assembly (also called a lamination assembly) is to cut a whole battery piece into strip-shaped battery pieces by laser, print conductive glue on the strip-shaped battery pieces, and then bond the battery pieces to form circuit connection. Because the cells of the laminated assembly are in direct contact without gaps, more than 13 percent of the cells of the conventional assembly can be placed in the same assembly area by adopting the laminated assembly. Meanwhile, as the area of the battery piece is reduced, the current in the battery is reduced, and the loss in the battery is reduced when the assembly works. Therefore, the laminated assembly has the advantages of high output power, low internal loss, small reverse current hot spot effect and the like, and the laminated assembly is higher than a 72-type integral assembly of the same type by more than 20W under the same condition. The key of the technology of the laminated assembly is the reliability of the connection between the battery plates.

The laminated assembly is characterized in that adjacent battery plates are connected by introducing conductive adhesive, and due to the introduction of a new material of the conductive adhesive, the reliability of the connection between the battery plates has certain risks, and due to the fact that the laminated assembly is formed by overlapping the edges of two battery plates for connection and a certain distance exists between the two battery plates, a potential water invasion site exists, and the existence of the water invasion site can cause the assembly to have certain risks in the aspects of HF (wet freezing test), DH (wet heat test), TC (thermal cycle test) and the like in the reliability test.

In addition, under the condition of not influencing the connection of the battery piece as much as possible, how to reduce the consumption of the conductive adhesive to reduce the cost is also an important research direction in the field.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

The purpose of the present disclosure is to overcome the defects of the prior art, and provide a screen pattern, a printing structure and a printing assembly for printing conductive paste in a tile stack assembly, which have good contact performance, excellent mechanical resistance and good reliability.

The utility model provides a half tone figure for printing conducting resin in shingle assembly which technical scheme is:

a screen pattern for printing conductive adhesive in a tile-stacked assembly is characterized in that a plurality of discontinuous sectional areas are arranged on the screen pattern, and a plurality of through holes are formed in each discontinuous sectional area; the number of the discontinuous sectional areas is the same as the number of the sections of the back electrode of the cell piece, and the width of the discontinuous sectional areas is smaller than that of the back electrode of the cell piece.

The screen printing plate pattern for printing the conductive adhesive in the tile-overlapping assembly further comprises the following auxiliary technical scheme:

wherein, each discontinuous sectional area is provided with at least one row of through holes.

Wherein the shape of the through hole includes an ellipse, a circle and a polygon.

The present disclosure also provides a conductive offset printing structure for a shingle assembly, wherein the conductive paste is printed in an area where a back electrode of a cell sheet is located through a screen pattern; wherein the screen pattern is the screen pattern.

The electrically conductive offset printing structure for a shingle assembly provided by the present disclosure further comprises the following subsidiary technical solutions:

when the width of the through holes on the screen pattern is the same as that of the conductive adhesive, each discontinuous sectional area is provided with a row of through holes; when the width of the through hole is less than half of the width of the conductive adhesive, two lines of through holes are arranged on each discontinuous sectional area.

The present disclosure also provides a stack assembly comprising a first cell, a second cell, and a conductive adhesive electrically connecting a front electrode of the first cell with a back electrode of the second cell; the conductive offset printing is characterized by adopting the conductive offset printing structure for printing.

The tile stack assembly further comprises the following auxiliary technical scheme:

the first battery piece and the second battery piece are strip-shaped battery pieces formed by cutting the whole battery piece.

The implementation of the present disclosure includes the following technical effects:

according to the conductive adhesive printing structure for the laminated assembly, the printing position of the conductive adhesive is set in the area where the back electrode of the battery piece is located, so that the contact distance between the two battery pieces in the laminated assembly is reduced, the contact performance between the two battery pieces is improved, and the possible reliability risk of the assembly is reduced; and, because traditional battery structure, its manufacture craft is for printing silver back electrode earlier, then prints aluminium back of the body electric field again, make through the sintering at last, consequently, the back electrode place region of traditional battery is less than back of the body electric field place region, thereby make the region at back electrode place and the region at back of the body electric field place have the difference in height, this disclosure just in time sets up the conducting resin in the region at back electrode place, thereby make the distance between two adjacent battery pieces reduce, consequently the possibility of steam invasion further reduces, subassembly HF (wet freeze test), DH (wet heat test), TC (thermal cycle experiment) reliability risk further reduces. And because the conductive adhesive is completely positioned in the electrode, when the two battery pieces are connected, the fragment rate can be reduced, and the mechanical load performance of the assembly can be improved. By adopting the conductive adhesive subsection design and the design that each subsection adopts a plurality of figures with the same shape to combine, the connection reliability is not influenced, and meanwhile, the consumption of the conductive adhesive can be reduced, and the conductive adhesive has a positive effect on the reduction of the cost.

Drawings

Fig. 1 is a schematic front view of a monolithic battery.

Fig. 2 is a schematic diagram of the back structure of the whole cell.

Fig. 3 is a schematic front structure view of a strip-shaped battery piece according to the present invention.

Fig. 4 is a schematic diagram of the back structure of the strip-shaped battery piece of the invention.

Figure 5 is a schematic view of the construction of a shingle assembly of the present invention.

Fig. 6 is a schematic view of the installation of the conductive paste printing structure of the present invention.

Fig. 7 is a partial top view of fig. 6.

Fig. 8 is a schematic diagram of a screen pattern shape and a conductive paste shape of a conventional conductive paste.

FIG. 9 is a schematic diagram of the screen pattern morphology of the conductive paste of the present invention and the morphology of the conductive paste.

Fig. 10 is a schematic diagram of a halftone pattern profile of each segmented conductive paste according to an embodiment of the invention.

Fig. 11 is a schematic diagram of a halftone pattern profile of each segmented conductive paste according to another embodiment of the invention.

Fig. 12 is a schematic view of the topography of each segmented conductive paste in one embodiment of the invention.

Fig. 13 is a schematic view of the topography of each segmented conductive paste in one embodiment of the invention.

In the figure, 1-conductive adhesive, 2-back electrode, 3-first cell, 4-second cell, 5-front electrode, 6-fine grid line, 7-aluminum back field, 8-discontinuous sectional area, 81-through hole.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

In the prior art, as shown in fig. 8, the conductive paste and the halftone pattern of the conductive paste are continuous.

In the present disclosure, as shown in fig. 9, the conductive paste and the halftone pattern of the conductive paste are segmented.

As shown in fig. 9-11, the present disclosure provides a screen pattern for printing conductive paste in a tile stack assembly, wherein a plurality of discontinuous segmented regions 8 are disposed on the screen pattern, and each discontinuous segmented region 8 is disposed with a plurality of through holes 81; the number of the discontinuous sectional areas 8 is the same as the number of the sections of the back electrode of the cell piece, and the width of the discontinuous sectional areas 8 is smaller than that of the back electrode of the cell piece. According to the method, the plurality of discontinuous segmentation areas are arranged on the screen printing plate graph, and the plurality of through holes are arranged on each segmentation area, so that when the conductive adhesive is used for screen printing of the graph provided by the method, the slurry of the conductive adhesive can be saved; meanwhile, the number of the discontinuous sectional areas is set to be the same as the number of the sections of the back electrode of the cell piece, and the width of the discontinuous sectional areas is set to be smaller than the width of the back electrode of the cell piece, so that when the conductive adhesive is printed by using the screen pattern provided by the disclosure, the conductive adhesive can be ensured to be fully contacted with the back electrode.

Wherein, each discontinuous sectional area 8 is provided with at least one row of the through holes 81. As shown in fig. 10, each of the discontinuous segmented regions 8 is provided with one row of the through holes 81, and as shown in fig. 11, each of the discontinuous segmented regions 8 is provided with two rows of the through holes 82. The non-continuous sectional areas are provided with one or two rows of through holes, so that the problem that the edge position of the conductive adhesive printed by the screen pattern in the non-continuous sectional areas is not well covered due to overlarge blank area around the screen pattern is solved.

Wherein, the shape of the through hole 81 includes an ellipse, a circle and a polygon. As shown in fig. 11, the through-hole has a circular shape, and as shown in fig. 10, the through-hole has a rounded rectangular shape. In fact, the through holes 81 in the present disclosure may be provided in a pattern of an arbitrary shape.

In some preferred embodiments, as shown in FIG. 10, each discontinuous segmented region 8 is provided with a row of round rectangular through holes 81. This disclosure is through all setting up a list of fillet rectangle through-hole on every discontinuous sectional type region 8, when using the screen printing pattern printing conducting resin that all is provided with a list of fillet rectangle through-hole on every discontinuous sectional type region 8 in this disclosure, the appearance of conducting resin structure is continuous, does not have the clearance, and the edge is also more neat, and it compares with the continuous design of conducting resin and the sectional structure figure design of other shapes, has also further reduced the risk of reliability, especially subassembly HF (wet freeze test), DH (wet heat test), TC (thermal cycle experiment) reliability risk.

As shown in fig. 5-13, in the conductive paste printing structure for a stack assembly provided by the present disclosure, a conductive paste 1 is printed in an area where a back electrode 2 of a cell sheet is located by screen printing; wherein, a plurality of discontinuous sectional areas 8 are arranged on the screen pattern, and a plurality of through holes 81 are arranged in each discontinuous sectional area 8; the number of the discontinuous sectional areas 8 is the same as the number of the sections of the back electrode of the cell piece, and the width of the discontinuous sectional areas 8 is smaller than that of the back electrode of the cell piece.

The utility model provides a conductive adhesive printing structure for shingle assembly, set up in the region at battery piece back electrode place through the printing position with conductive adhesive, because traditional battery structure, its manufacture craft is for printing silver back electrode earlier, then print aluminium back electric field again, make through the sintering at last, therefore, the back electrode place region of traditional battery is less than back electric field place region, thereby it has the difference in height to make the region at back electrode place and the region at back electric field place, this disclosure just in time sets up conductive adhesive in the region at back electrode place, thereby make the distance between two adjacent battery pieces reduce, therefore the possibility that steam invades further reduces, subassembly HF (wet freeze test), DH (wet heat test), TC (heat cycle experiment) reliability risk further reduces. Meanwhile, as the conductive adhesive is completely positioned in the electrode, when the two battery pieces are connected, the fragment rate can be reduced, and the mechanical load performance of the assembly can be improved; by adopting the screen printing plate pattern printing instead of the traditional method of setting the conductive adhesive into a solid segmented structure, the consumption of the conductive adhesive is reduced; moreover, the applicant has learned through a large number of tests and analyses that since the conductive adhesive material has certain fluidity, after the conductive adhesive is printed by adopting a plurality of combinations with the same shape, when two battery pieces are bonded, the patterns of the conductive adhesive are still continuous due to extrusion. Therefore, in the present disclosure, the conductive paste of each segment is designed into a combination of a plurality of structures with the same shape through the screen pattern, which does not affect the conductivity of the conductive paste, and the amount of the conductive paste can be saved.

As shown in fig. 5, the present invention further provides a laminated assembly, which includes a first cell 3, a second cell 4, and a conductive adhesive 1 electrically connecting the front electrode 5 of the first cell 3 and the back electrode 2 of the second cell 4; the conductive offset printing is characterized by adopting the conductive offset printing structure for printing.

As shown in fig. 1 to 5, the front surfaces of the first cell piece 3 and the second cell piece 4 are both provided with thin grid lines 6, and the back surfaces of the first cell piece 3 and the second cell piece 4 are both provided with aluminum back fields 7.

Wherein, the first battery piece 3 and the second battery piece 4 are strip-shaped battery pieces formed by cutting the whole battery piece in fig. 1-2.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A screen pattern for printing conductive adhesive in a tile-stacked assembly is characterized in that a plurality of discontinuous sectional areas are arranged on the screen pattern, and a plurality of through holes are formed in each discontinuous sectional area; the number of the discontinuous sectional areas is the same as the number of the sections of the back electrode of the cell piece, and the width of the discontinuous sectional areas is smaller than that of the back electrode of the cell piece.

2. The screen pattern for printing conductive paste in a tile stack assembly of claim 1, wherein each of said discrete segmented regions has at least one row of said through holes.

3. The screen pattern for printing conductive paste in a tile stack assembly of claim 1, wherein the shape of said through holes comprises oval, circular and polygonal.

4. A conductive offset printing structure for a shingle assembly is characterized in that conductive adhesive is printed in an area where a back electrode of a cell sheet is located through a screen pattern; wherein the screen pattern is the screen pattern of any one of claims 1 to 3.

5. The structure of claim 4, wherein each of said discontinuous segmented regions is provided with a row of said through holes when said through holes on said screen pattern have the same width as said conductive paste; when the width of the through hole is less than half of the width of the conductive adhesive, two lines of through holes are arranged on each discontinuous sectional area.

6. A laminated assembly comprises a first battery piece, a second battery piece and conductive adhesive for electrically connecting a front electrode of the first battery piece with a back electrode of the second battery piece; characterized in that the conductive offset printing is printed using the conductive offset printing structure of claim 4 or 5.

7. The stack assembly of claim 6, wherein the first cell piece and the second cell piece are each a strip-shaped cell piece formed by cutting a whole cell piece.