CN213546327U - Screen printing plate for photovoltaic cell and photovoltaic cell - Google Patents

Abstract

The utility model provides a half tone and photovoltaic cell piece for photovoltaic cell piece, wherein, the half tone is including covering district and fretwork district, the pattern in fretwork district is corresponding to photovoltaic cell piece metal electrode, the fretwork district include a pair of mutual parallel arrangement's marginal zone, through the limit angle district connect in the marginal zone corresponds the vice bars district between the end limit, the limit angle district is circular-arc setting. The arc-shaped corner area is easy to form slurry in the process of printing the slurry through the screen printing plate, and the abnormal problem that grid lines are wide or broken in metal electrodes in the corner area of the photovoltaic cell can be effectively solved.

Description

Screen printing plate for photovoltaic cell and photovoltaic cell

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a half tone and photovoltaic cell piece for photovoltaic cell piece.

Background

In recent years, high-power modules are increasingly pursued in the photovoltaic industry, and the shingled modules are favored by various manufacturers due to higher output power. Compared with the traditional photovoltaic module, the shingle assembly enables the front main grid line of one cell piece to be overlapped with the back main grid line of the back of another cell piece by mutually connecting the photovoltaic cells in a more compact mode, so that the gap between the photovoltaic cells is reduced to the minimum, the effective power generation area is increased, and the output power is increased.

The tile-stacked assembly needs to be cut into small units by laser in the manufacturing process, and a plurality of small units are packaged after being connected in series, so that the grid line pattern of a photovoltaic cell used for the tile-stacked assembly needs to be changed according to the design requirement of the tile-stacked assembly, the grid line pattern printed by using a conventionally designed screen printing plate has abnormal printing, such as grid breakage, thick grid line, abnormal overlapping after laser scribing and the like, and because the intersection of a secondary grid line and an edge grid line which are parallel to a main grid on the existing photovoltaic cell is arranged in a chamfer, the abnormal condition of thick line width or grid breakage can occur during printing; these abnormal problems bring great influence to the quality of photovoltaic cells and assembly section products, and even can influence normal production of production lines.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel a half tone and photovoltaic cell piece for photovoltaic cell piece solve above-mentioned problem.

In order to achieve the above object, the present invention provides the following technical solutions:

the screen printing plate for the photovoltaic cell piece comprises a covering area and a hollowed-out area, wherein patterns of the hollowed-out area correspond to metal electrodes of the photovoltaic cell piece, the hollowed-out area comprises a pair of edge areas which are arranged in parallel, and auxiliary grid areas which are connected between corresponding end edges of the edge areas through edge and corner areas, and the edge and corner areas are arranged in an arc shape.

Further, the edge area is provided with a first area and a first transition area which connects the first area and the corner area, and the first transition area is arranged in a manner of gradually narrowing from the tail end of the first area to the corner area; the secondary grid region is provided with a second region and a second transition region which is connected with the second region and the other end of the corner region, and the second transition region is arranged in a manner that the second transition region gradually narrows from the tail end of the second region to the corner region.

Further, the length of the first transition zone is between 0.5 and 1.5 cm; first transition district is adjacent the tip in limit angle district with the internal diameter width in limit angle district is 25um, first transition district is adjacent the tip internal diameter width in first district is 35 um.

Further, the length of the second transition zone is between 0.5 and 1.5 cm; the second transition district is adjacent the tip internal diameter width in limit district is 25um, the second transition district is adjacent the tip internal diameter width in second district is 35 um.

Furthermore, the hollow-out area also comprises a main grid area which is connected with the other end edge of the pair of edge areas, and the main grid area and the auxiliary grid area are respectively arranged at the two ends of the edge areas; and the pair of the edge area, the secondary grid area and the main grid area form a printing area of a slicing unit.

Further, the mask region includes an alignment region provided on the main gate region near an end thereof.

Furthermore, the hollow-out area also comprises a plurality of thin gate areas which are positioned between the pair of edge areas and are parallel to the edge areas, and two end parts of the thin gate areas are respectively connected with the main gate area and the auxiliary gate area.

The utility model also provides a photovoltaic cell piece, including silicon chip, the metal electrode of setting on the silicon chip surface, wherein, the metal electrode includes a pair of parallel arrangement's marginal grid line, connect in through the corner grid line the marginal grid line corresponds the vice grid line between the end limit, the corner grid line is circular-arcly.

Furthermore, the metal electrode further comprises a main grid line connected with the other end edge of the edge grid line, the main grid line and the auxiliary grid line are respectively arranged at two ends of the edge grid line, and an alignment part is arranged on the main grid line close to the end part of the main grid line.

Furthermore, the alignment part is one or more of a solid circle, a triangle and a cross of a bare silicon wafer, and the maximum inner diameter of the alignment part is smaller than the width of the main grid line.

Compared with the prior art, the beneficial effects of the utility model reside in that: the edge area on the screen printing plate and the corner area adjacent to the secondary grid area are set to be arc-shaped, so that the corner area is easy to form slurry in the process of printing the slurry, the abnormal problem that grid lines are wide or broken in metal electrodes in the corner area of a photovoltaic cell piece can be effectively solved, and the appearance quality qualified rate of the photovoltaic cell is improved.

Drawings

Fig. 1 is a schematic view of a screen structure in an embodiment of the screen for photovoltaic cells of the present invention.

Fig. 2 is a partial enlarged view of the screen a in the embodiment of fig. 1.

Wherein, the method comprises the following steps of 10-hollowed-out area, 11-edge area, 111-first area, 112-first transition area, 12-secondary grid area, 121-second area, 122-second transition area, 13-corner area, 14-main grid area, 15-fine grid area, 16-connecting area, 20-covering area and 21-aligning area.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

In the various drawings of the present invention, certain dimensions of structures or portions may be exaggerated relative to other structural portions for ease of illustration and, thus, are provided only to illustrate the basic structure of the subject matter of the present invention.

As shown in fig. 1, the utility model provides a half tone for photovoltaic cell of shingle assembly for print photovoltaic cell's metal electrode, the half tone includes the screen cloth, with screen cloth exhibition and fixed screen frame all around (not shown), wherein, be equipped with fretwork district 10 on the screen cloth and cover district 20, when printing metal electrode on photovoltaic silicon piece, utilize the scraper to scrape the metal thick liquids on the screen cloth, the metal thick liquids in fretwork district 10 are printed on photovoltaic silicon piece, form metal electrode after the stoving sintering, consequently, the pattern in fretwork district 10 corresponds the metal electrode on the photovoltaic cell, correspondingly, it does not see through the thick liquids to cover district 20, it receives irradiant region and then is used for carrying out photoelectric conversion to correspond the photovoltaic cell piece.

It can be understood that the utility model provides a screen printing plate is suitable for but not limited to in the screen printing technology of photovoltaic cell such as monocrystalline silicon, polycrystalline silicon, the utility model discloses use polycrystalline silicon cell to carry out detailed description as the example, moreover the utility model discloses a screen printing plate design is also not limited to the size that is applicable to the photovoltaic cell size.

Specifically, the hollowed-out area 10 includes a pair of edge areas 11 arranged in parallel, and a sub-grid area 12 connected between corresponding end edges of the edge areas 11 through corner areas 13, where the corner areas 13 are arranged in an arc shape. The edge region 11 of the screen corresponds to an edge grid line on the photovoltaic cell, the secondary grid region 12 corresponds to a secondary grid line, and the corner region 13 corresponds to a corner grid line, that is, the edge grid line and the secondary grid line on the photovoltaic cell are connected through the corner grid line, so that current can be collected to the secondary grid line and conducted to the next group of photovoltaic cell pieces or external equipment through the secondary grid line. In the process of printing the slurry by the screen printing plate, the arc-shaped corner area 13 is beneficial to forming the slurry, and the abnormal problems of wide line width or broken grid and the like of corner grid lines can be effectively solved.

Preferably, the inside diameter width of the corner region 13 is 25um, which is convenient for transiting with the edge region and the secondary grid region.

As a preferred embodiment of the present invention, the edge region 11 has a first region 111, and a first transition region 112 connecting the first region 111 and the corner region 13, wherein the first transition region 112 is disposed to be gradually narrowed from the end of the first region 111 toward the corner region 13; by the design of gradually narrowing the line width of the first transition region 122, on one hand, the abnormal problem that the line width of the metal electrode in the corner region of the photovoltaic cell is wide in grid lines can be solved; on the other hand, the edge region 11 and the corner region 13 are connected naturally and smoothly, so that the line widths of the metal electrodes of the photovoltaic cells are consistent, and the appearance quality requirement of the photovoltaic cells is met.

Further, the inner diameter width of the first transition region 112 is transited to the inner diameter width the same as that of the corner region 13, so that the metal electrodes at the corresponding positions on the photovoltaic cell are naturally connected, and the appearance quality requirement of the photovoltaic cell is met.

First district 111 does marginal zone 11 keeps away from the region of marginal zone 13, the internal diameter width of first district 111 is 35um for the marginal grid line width that screen printing formed is unanimous, accords with the quality requirement of photovoltaic cell outward appearance, and on the other hand, the suitable width of marginal grid line can balance the requirement in two aspects of the shading area of photovoltaic cell and the resistivity of marginal grid line, is in the optimum state with the assurance photovoltaic cell photoelectric conversion efficiency.

Further, the length of the first transition area 112 is between 0.5 and 1.5 cm; first transition zone 112 is adjacent the tip internal diameter width of corner district 13 is 25um, first transition zone 112 is adjacent the tip internal diameter width of first district 111 is 35 um. That is to say, the inner diameter width of the edge region 11 is gradually reduced from the width of 35um of the first region 111 to the width of the corner region 13, so as to ensure that the line width of the edge grid line corresponding to the first transition region 112 is within a normal range, and the overall appearance of the photovoltaic cell meets the quality requirement.

As a preferred embodiment of the present invention, the auxiliary grid region 12 has a second region 121, and a second transition region 122 connecting the second region 121 and the other end of the corner region 13, the second transition region 122 is a gradually narrowing setting from the end of the second region 121 toward the corner region 13, so that the transition between the auxiliary grid region 12 and the corner region 13 is smooth, the abnormal problem of the wide grid line in the metal electrode line width of the corner region of the photovoltaic cell can be solved, and the requirement of the appearance quality of the photovoltaic cell can be met.

Specifically, the second region 121 does keep away from the region of corner district 13 on the vice bars district 12, the internal diameter width of second region 121 is 35um for the vice grid line width that screen printing formed accords with the appearance quality requirement, compromises photovoltaic cell's efficiency output simultaneously.

Further, the length of the second transition zone 122 is between 0.5 and 1.5 cm; the second transition area 122 is adjacent the tip internal diameter width of corner region 13 is 25um, the second transition area 122 is adjacent the tip internal diameter width of second district 121 is 35um, that is to say, the internal diameter width of vice gate region 12 is reduced gradually by the 35um width in second district to corner region 13's width to ensure that the line width of the corresponding vice grid line of second transition area 122 is in normal range, make the holistic outward appearance of photovoltaic cell accord with the requirement of quality.

It is understood that the first transition area 112 and the second transition area 122 may be configured to be continuously narrowed, may be configured to be gradually narrowed in multiple segments, or may be configured to be gradually narrowed in a combination of continuous narrowing and continuous narrowing, so as to achieve the purpose of gradually narrowing the first area 111 and the second area 121 to the corner area 13.

As a preferred embodiment of the present invention, the hollow-out area 10 further includes a main grid region 14 connecting another end edge of the pair of edge regions 11, and the main grid region 14 and the auxiliary grid region 12 are respectively disposed at two ends of the edge regions 11; a pair of the edge region 11, the sub-gate region 12 and the main gate region 14 forms a printing region of a cutting unit, that is, the sub-gate region is disposed close to the main gate region 14 of another adjacent printing region of the cutting unit. Utilize the utility model discloses a photovoltaic cell piece that screen printing formed utilizes laser to distinguish two adjacent section unit printings, and the metal electrode at the vice grid line and the adjacent section unit printings district back is together fixed with conducting resin to form the photovoltaic cell of close packing, form the subassembly of shingleing after the lamination is sealed.

Furthermore, the screen printing plate comprises a plurality of slicing unit printing areas, and the slicing unit printing areas are symmetrically arranged by taking the direction of 12 degrees along the length of the auxiliary grid area as the center. In this embodiment, the screen includes 6 printing areas of the slicing unit, the sub-grid areas 12 of the printing areas of the middle two slicing units are adjacently disposed, and the outer sides of the printing areas of the slicing units at the edge of the screen are the main grid areas 14.

Further, the hollow-out area 10 further includes a plurality of thin gate areas 15 located between the pair of edge areas 11 and parallel to the edge areas 11, and two end portions of the thin gate areas 15 are respectively connected to the main gate area 14 and the sub-gate area 12. The fine gate region 15 forms a fine gate electrode on the photovoltaic cell sheet, and the fine gate electrode is used for collecting and conducting current generated by the photovoltaic cell when the photovoltaic cell is irradiated by light.

Further, the hollow-out area 10 further includes a plurality of connection areas 16 connected to two adjacent thin gate areas 15 at intervals, the connection areas 16 are arranged in parallel with the auxiliary gate area 12 and the main gate area 14, the connection areas 16 correspond to connection gate lines connected to two thin gate lines on the photovoltaic cell, and the connection gate lines connect the thin gate lines together, so that when the thin gate lines are broken, current can be collected by the nearby thin gate lines, and current loss of the photovoltaic cell can not be caused.

Meanwhile, the shading area of the surface of the photovoltaic cell and the use cost of the metal paste need to be considered, and the connecting regions 16 are arranged at intervals in the fine grid region 15.

Furthermore, a part of the thin gate region 15 extends from the auxiliary gate region 12 to the main gate region 14 of the printing region of the adjacent slicing unit, and the two printing regions of the slicing unit are connected together by the thin gate line 15, so that when the thin gate is broken, the current can still be collected and conducted by the nearby thin gate line.

As a preferred embodiment of the present invention, the masking zone 20 includes an alignment zone 21 disposed on the main grid 14 near the end thereof. The alignment area 21 does not leak paste during screen printing, so that an electrodeless alignment part is formed on a main grid line of the photovoltaic cell, before laser scribing, the position of the main grid line is identified by extracting a pattern corresponding to the alignment part on the main grid line, so that the divided cutting units are guaranteed to be in standard sizes, after two small cutting units are stacked up and down, white electrodes of secondary grid lines cannot be exposed, and the appearance of the stacked photovoltaic cell is guaranteed to be normal.

Preferably, the shape of the alignment area 21 is not limited to a solid circle, triangle, cross, etc., as long as the alignment area 21 forms a pattern on the photovoltaic cell that is different from the surrounding, and can be recognized, thereby ensuring that the laser scribed unit is of a standard size.

The utility model also provides a photovoltaic cell piece, including the silicon chip, set up the metal electrode on silicon chip surface, metal electrode is used for collecting and conduction current. The metal electrode comprises a pair of edge grid lines arranged in parallel, and auxiliary grid lines connected between corresponding end edges of the edge grid lines through corner grid lines, wherein the corner grid lines are arc-shaped, and the arc-shaped corner grid lines enable the connection between the edge grid lines and the auxiliary grid lines to be smoother.

Furthermore, the metal electrode also comprises a main grid line which is connected with the other end edge of the edge grid line, the main grid line and the auxiliary grid line are respectively arranged at two ends of the edge grid line to form a slicing unit, when the laminated tile assembly is manufactured, two adjacent slicing units are separated by laser, the auxiliary grid line and the metal electrode on the back of the adjacent slicing unit are fixed together by conductive adhesive, so that densely arranged photovoltaic cells are formed, and the laminated tile assembly is formed after lamination and sealing.

The main grid line is provided with an alignment part near the end part of the main grid line, the alignment part is a metal-free electrode area of an exposed silicon wafer, when the main grid line is sliced by laser, the position of the main grid line can be detected through an alignment point, so that a slicing unit can be accurately identified, and the phenomenon of poor appearance of subsequent tile-stacked assemblies caused by cutting the main grid line is avoided.

Further, the alignment part is one or more of a solid circle, a triangle, and a cross, which may be used for identification, and preferably, the alignment part is a solid circle.

The maximum inner diameter of the alignment part is smaller than the width of the main grid line, so that metal electrodes around the alignment part are in a continuous state, and the purpose of conducting current by the main grid line is further ensured.

To sum up, the utility model is used for photovoltaic cell piece's half tone sets up to circular-arcly through marginal zone on with the half tone and the adjacent corner district of vice bars district, makes the metal electrode that the corner district can effectively solve photovoltaic cell piece corner district appears the grid line broad or the unusual problem of disconnected bars in the shaping of the easy thick liquids of in-process of printing thick liquids, promotes photovoltaic cell appearance quality qualification rate.

It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The above detailed description of a series of embodiments is only for the purpose of illustration, and is not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications that do not depart from the spirit of the invention.

Claims (10)

1. The utility model provides a half tone for photovoltaic cell piece, is including covering district and fretwork district, the pattern in fretwork district is corresponding to photovoltaic cell piece metal electrode, its characterized in that: the hollowed-out area comprises a pair of edge areas which are arranged in parallel, and auxiliary grid areas which are connected between corresponding end edges of the edge areas through corner areas, wherein the corner areas are arranged in an arc shape.

2. The screen for photovoltaic cells as claimed in claim 1, wherein: the edge area is provided with a first area and a first transition area which connects the first area and the corner area, and the first transition area is gradually narrowed from the tail end of the first area to the corner area; the secondary grid region is provided with a second region and a second transition region which is connected with the second region and the other end of the corner region, and the second transition region is arranged in a manner that the second transition region gradually narrows from the tail end of the second region to the corner region.

3. The screen for photovoltaic cells as claimed in claim 2, wherein: the length of the first transition zone is between 0.5 and 1.5 cm; first transition district is adjacent the tip in limit angle district with the internal diameter width in limit angle district is 25um, first transition district is adjacent the tip internal diameter width in first district is 35 um.

4. The screen for photovoltaic cells as claimed in claim 3, wherein: the length of the second transition zone is between 0.5 and 1.5 cm; the second transition district is adjacent the tip internal diameter width in limit district is 25um, the second transition district is adjacent the tip internal diameter width in second district is 35 um.

5. The screen for photovoltaic cells as claimed in claim 2, wherein: the hollow-out area also comprises a main grid area which is connected with the other end edge of the edge area, and the main grid area and the auxiliary grid area are respectively arranged at the two ends of the edge area; and the pair of the edge area, the secondary grid area and the main grid area form a printing area of a slicing unit.

6. The screen for photovoltaic cells as claimed in claim 5, wherein: the masked region includes an alignment region disposed on the primary gate region near an end thereof.

7. The screen for photovoltaic cells as claimed in claim 5, wherein: the hollow-out area further comprises a plurality of thin grid areas which are located between the pair of edge areas and parallel to the edge areas, and two end parts of each thin grid area are respectively connected with the main grid area and the auxiliary grid area.

8. A photovoltaic cell piece comprises a silicon chip and a metal electrode arranged on the surface of the silicon chip, and is characterized in that: the metal electrode comprises a pair of edge grid lines arranged in parallel, and auxiliary grid lines connected between corresponding end edges of the edge grid lines through corner grid lines, wherein the corner grid lines are arc-shaped.

9. The photovoltaic cell sheet of claim 8, wherein: the metal electrode further comprises a main grid line connected with the other end edge of the edge grid line, the main grid line and the auxiliary grid line are respectively arranged at two ends of the edge grid line, and an alignment part is arranged on the main grid line close to the end part of the main grid line.

10. The photovoltaic cell sheet of claim 9, wherein: the alignment part is one or more of a solid circle, a triangle and a cross of an exposed silicon chip, and the maximum inner diameter of the alignment part is smaller than the width of the main grid line.

Images