CN113937188A

CN113937188A - Method for manufacturing zigzag grid line

Info

Publication number: CN113937188A
Application number: CN202111141047.6A
Authority: CN
Inventors: 彭文博; 罗丽珍; 陈雄飞; 赵东明; 肖平; 李晓磊
Original assignee: Huaneng Clean Energy Research Institute; Huaneng Group Technology Innovation Center Co Ltd
Current assignee: Huaneng Clean Energy Research Institute; Huaneng Group Technology Innovation Center Co Ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-01-14
Anticipated expiration: 2041-09-28
Also published as: CN113937188B

Abstract

The invention discloses a manufacturing method of a zigzag grid line, which comprises the following steps: lay the shaping layer on the battery piece, the shaping layer constitutes grid line printing groove, pours into conductive silver thick liquid into grid line printing inslot, will conductive silver thick liquid stoving shaping busbar in the grid line printing inslot removes the shaping layer, cuts the shaping into cockscomb structure grid line with the busbar through cutting device. The manufacturing method of the zigzag grid line provided by the invention has the advantages of high production efficiency and good forming effect.

Description

Method for manufacturing zigzag grid line

Technical Field

The invention relates to the technical field of photovoltaic equipment, in particular to a manufacturing method of a sawtooth grid line.

Background

With the increasing shortage of global energy, solar cells are widely regarded by countries in the world, and a large number of companies have been put into research, development and production of solar cells internationally. In a crystalline silicon solar cell, a positive electrode grid line on a silicon wafer is an essential component for collecting current emitted by the solar cell, and the performance of the grid line directly influences the energy conversion efficiency of the cell. The photoelectric conversion efficiency is an important performance index of the solar cell, and higher photoelectric conversion efficiency is always a target for developing the cell. The resistance of electrode grid line has then influenced the transmission of electron, electrode grid line resistance is big more, consume in the electric current of battery piece just big more, the area of contact on edge reduces connecting resistance about improving the electrode grid line, the shaping of electrode grid line receives restraint such as mobility, processing technology of electrically conductive silver thick liquid, because electrically conductive silver thick liquid has certain mobility, can appear thick liquids at this in-process and collapse toward grid line both sides, cause unedged phenomenon, lead to showing the increase of grid line width, be unfavorable for the improvement of battery piece efficiency.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the invention provides a manufacturing method of a zigzag gate line, and the manufacturing method of the zigzag gate line has the advantages of high production efficiency and good forming effect.

According to the manufacturing method of the sawtooth-shaped grid line, the forming layer is laid on the battery piece, the forming layer forms the grid line printing groove, conductive silver paste is injected into the grid line printing groove, the conductive silver paste in the grid line printing groove is dried to form the conductive strip, the forming layer is removed, and the conductive strip is cut and formed into the sawtooth-shaped grid line through the cutting device.

According to the manufacturing method of the zigzag grid line, the forming layer is arranged, so that the grid line printing groove is formed at the set position of the battery piece conveniently, the conductive silver paste poured in the grid line printing groove can be further ensured to be solidified and formed into the conductive bar with the moderate height-to-width ratio, and the zigzag grid line positioned at the set position of the battery piece can be obtained after cutting is completed. Therefore, the forming of the zigzag grid lines is accurate and quick, and the production efficiency is high.

In some embodiments, the depth of the gate line forming groove is 30um to 100um, and the width of the gate line forming groove is 20um to 60 um.

In some embodiments, the grid line forming grooves are distributed on the printing surface of the battery piece at intervals along the width direction of the battery piece, and two grid line forming grooves at edge positions are respectively located at two edges of the printing surface in the width direction.

In some embodiments, the molding layer includes a plurality of molding films, the molding films are distributed at intervals in the width direction of the battery piece, and the printing grid line is formed between any adjacent molding films.

In some embodiments, two of the molding films at the edge are attached to the side surface of the battery piece and at least partially protrude from the printing surface, and the rest of the molding films are attached to the printing surface.

In some embodiments, the molding layer comprises a molding sheet, and a plurality of the grid line molding grooves are formed on the molding sheet.

In some embodiments, the forming tabs are made of a hard material.

In some embodiments, the cutting device includes a laser modulator spaced apart from the battery piece, and the laser beam emitted by the laser modulator is opposite to the conductive strip in a thickness direction of the battery piece.

In some embodiments, the number of the laser beams is equal to the number of the occlusion slopes of the zigzag grid line, and the laser beams are used for cutting and forming the corresponding occlusion slopes.

In some embodiments, the cutting device further comprises a support, a cutting platform slidably connected to the support for holding the battery piece, and a positioner for positioning the serrated grid lines, the laser modulator being mounted to the support and spaced apart from the cutting platform in a sliding direction.

In some embodiments, the method for making the zigzag gate line further comprises recovering the chips cut from the conductive strip.

Drawings

Fig. 1 is a schematic view of a grid line printing groove at the edge of a battery piece according to an embodiment of the invention.

Fig. 2 is a schematic view of a grid line printing groove on a printing surface of a battery piece according to an embodiment of the invention.

Fig. 3 is a schematic view of the operation of the cutting device according to an embodiment of the present invention.

Reference numerals: 1. a grid line printing slot; 2. forming a film; 3. a conductive strip; 4. a battery piece; 5. a cutting device; 51. a laser modulator; 52. a support; 53. cutting the platform; 6. a laser beam.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

According to the manufacturing method of the zigzag grid line, the battery piece 4 is paved into the molding layer, the molding layer forms the grid line printing groove 1, conductive silver paste is injected into the grid line printing groove 1, the conductive silver paste in the grid line printing groove 1 is dried to form the conductive strip 3, the molding layer is removed, and the conductive strip 3 is cut and molded into the zigzag grid line through the cutting device 5.

According to the manufacturing method of the zigzag grid line provided by the embodiment of the invention, the forming layer is arranged, so that the grid line printing groove 1 is conveniently formed at the set position of the battery piece 4, the conductive silver paste poured in the grid line printing groove 1 can be further ensured to be solidified and formed into the conductive bar 3 with a moderate height-to-width ratio, and the zigzag grid line positioned at the set position of the battery piece 4 can be obtained after cutting is completed. Therefore, the forming of the zigzag grid lines is accurate and quick, and the production efficiency is high.

As shown in fig. 1, taking the length direction of the prefabricated zigzag gate lines and the length direction of the battery piece 4 as an example, the length direction of the battery piece 4 is the direction a, the height of the zigzag gate lines refers to the size of the zigzag gate lines in the thickness direction of the battery piece 4, i.e., the direction B, and the thickness of the zigzag gate lines refers to the size of the zigzag gate lines in the width direction of the battery piece 4. At the moment, the height of the zigzag grid line is equal to the depth of the grid line forming groove, and the thickness of the zigzag grid line is equal to the width of the grid line forming groove. Therefore, the width and the height of the solidified and formed conductive bar 3 are consistent with those of the pre-manufactured serrated grid line, and then only an inclined plane needs to be cut in the subsequent cutting process, so that the production efficiency of the serrated grid line is improved.

In some embodiments, the grid line forming grooves are multiple and distributed on the printing surface of the battery piece 4 at intervals along the width direction of the battery piece 4, and two grid line forming grooves at edge positions are respectively located at two edges of the printing surface in the width direction.

Specifically, the grid line forming grooves are used for forming a plurality of zigzag grid lines on the surface of the battery piece 4, and the zigzag grid lines are parallel to each other. The border position is the edge of 4 tip of battery piece, and on 4 width direction of battery piece, the side that is located the outwards of the grid line shaping groove of tip and the corresponding terminal surface coplane of battery piece 4 guarantee from this that two cockscomb structure grid lines that are located the border position are respectively with battery piece 4 at width direction's both ends face parallel and level, and then reduce sheltering from of two 4 stacks back of battery pieces to battery piece 4, increase battery piece 4's effective area, and battery piece 4 photoelectric conversion efficiency improves.

In some embodiments, the molding layer comprises a plurality of molding films 2, the plurality of molding films 2 are distributed at intervals in the width direction of the battery piece 4, and a printing grid line is formed between any adjacent molding films 2.

Specifically, shaping membrane 2 adopts the thermoplasticity good and the material that the melting point is higher than electrically conductive silver thick liquid solidification temperature, guarantees that shaping membrane 2 can not warp basically in electrically conductive silver thick liquid heating solidification process, improves the size precision of fashioned busbar 3 from this. Moreover, after the conductive silver paste is solidified to form the conductive strip 3, the forming film 2 can be torn off for repeated use, and the production cost of the zigzag grid line is effectively reduced. Alternatively, the molding film 2 may be a water-soluble molding film 2, and the molding film 2 is dissolved after the conductive strips 3 are produced.

In some embodiments, two of the shaped films 2 at the edges are attached to the side surfaces of the cell sheet 4 and at least partially protrude from the printed surface, and the remaining shaped films 2 are attached to the printed surface.

A plurality of forming films 2 are attached to the printing surface of the battery piece 4 in parallel, grid line printing grooves 1 of the zigzag grid lines formed between the adjacent forming films 2, the forming films 2 adhered to the side surfaces of the battery piece 4 and the grid line printing grooves 1 formed between the adjacent forming films 2 adhered to the printing surface are all used for forming the zigzag grid lines of the battery piece 4. The battery pieces 4 are divided in the subsequent process to form a plurality of battery pieces 4, a printing surface of each battery piece 4 is provided with a sawtooth-shaped grid line, and the sawtooth-shaped grid line is positioned at the edge of the printing surface.

In some embodiments, the molding layer comprises a molding sheet, and the molding sheet is provided with a plurality of grid line molding grooves.

Specifically, the area of the molding sheet is slightly larger than that of the battery sheet 4, so that grid line molding grooves are formed at the edge of the battery sheet 4. For the shaping membrane 2, a shaping piece bonds with battery piece 4 and can all busbar 3 of one shot forming, and because the grid line shaping trench position on the shaping piece is fixed, the position between each busbar 3 is more accurate, and the efficiency of laying of grid line shaping trench is high from this, and the production efficiency of cockscomb structure grid line is higher. Moreover, the forming sheet also avoids the precision error of the attaching existence of a plurality of forming films 2, and the position of the prepared conductive strip 3 is more accurate and the size is more accurate.

In some embodiments, the forming tabs are made of a hard material. The forming sheet is made of hard materials, the restraint capability of the forming sheet on the conductive silver paste is enhanced, the rigidity of the hard materials is strong, and the grid lines with tidy edges can be obtained.

In some embodiments, the cutting device 5 includes a laser modulator 51, the laser modulator 51 is spaced apart from the battery piece 4, and the laser beam emitted by the laser modulator 51 is opposite to the conductive strip 3 in the thickness direction of the battery piece 4.

Thus, the cutting device 5 can modulate a line of laser beams in a triangular zigzag shape by the laser modulator 51, and the laser beams cut the conductive strip 3 in a rectangular shape to form a zigzag gate line. The laser beam modulated by the laser modulator 51 may be a triangular sawtooth with any aspect ratio of micron order, and the shape of the triangular sawtooth is adjusted according to actual production needs. The laser beam is perpendicular to the printing surface of the cell 4 to cut the conductive strip 3, so that the damage of the laser beam to the surface of the cell 4 is effectively avoided.

In some embodiments, the number of laser beams is equal to the number of the occlusion slopes of the zigzag-shaped grating lines, and the laser beams are used for cutting and forming the corresponding occlusion slopes.

Thus, one laser beam cuts the conductive strip 3 to form a bite slope, and two intersecting laser beams cut the conductive strip 3 to form two collinear bite slopes, i.e., serrations. The occlusion inclined plane of the laser beam cutting position is smooth and neat, two zigzag grid lines are convenient to occlude, each sawtooth of one zigzag grid line is provided with two occlusion inclined planes, two laser beams are needed for processing, and the production efficiency of the zigzag grid lines is further improved by arranging all the occlusion inclined planes on the laser beam group once-forming zigzag grid lines.

In some embodiments, the cutting device 5 further comprises a support 52, a cutting platform 53, and a positioner. The cutting platform 53 is slidably connected to the support 52 and is used for fixing the battery piece 4, the positioner is used for positioning the zigzag grid lines, and the laser modulator 51 is mounted on the support 52 and is spaced from the cutting platform 53 in the sliding direction.

Specifically, the laser modulator 51 may be a strip, and can modulate a plurality of beams obliquely emitted at different angles, and the width of the beam is the same as the width of the grid line of the cell 4. The battery piece 4 is placed on the cutting platform 53, and the cutting platform 53 can move up and down along the support 52 to cut out the zigzag grid lines with different sizes. Fix battery piece 4 and cutting platform 53 together, avoid battery piece 4 to remove and cause the cutting of laser beam dislocation, the locator assists laser beam location grid line position, helps the laser beam to stabilize accurate cutting grid line. When a laser beam cuts the grid line, the laser beam firstly aligns to the position of the grid line through a positioner, and the laser beam cuts the grid line after being focused to form a saw-toothed grid line.

In some embodiments, the method for manufacturing the zigzag gate line further includes recovering the scraps cut from the conductive strip 3.

The scraps cut from the conductive strips 3 contain silver, and the scrap recovery can reduce the silver loss and help to reduce the manufacturing cost of the battery plate 4.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A manufacturing method of a zigzag grid line is characterized by comprising the following steps:

laying a forming layer on the battery piece, wherein the forming layer forms a grid line printing groove, and injecting conductive silver paste into the grid line printing groove;

drying the conductive silver paste in the grid line printing groove to form a conductive strip, and removing a forming layer;

and cutting the conductive strip into a serrated grid line by a cutting device.

2. The method of claim 1, wherein the depth of the grid line forming groove is 30um to 100um, and the width of the grid line forming groove is 20um to 60 um.

3. The method as claimed in claim 1, wherein the grid line forming grooves are distributed on the printing surface of the battery plate at intervals along the width direction of the battery plate, and two grid line forming grooves at the edge are respectively located on two edges of the printing surface in the width direction.

4. The method as claimed in claim 1, wherein the molding layer comprises a plurality of molding films, the molding films are spaced apart from each other in a width direction of the battery piece, and the printing grid line is formed between any adjacent molding films.

5. The method as claimed in claim 4, wherein two of the molding films at the edge are attached to the side surface of the battery piece and at least partially protrude from the printing surface, and the rest of the molding films are attached to the printing surface.

6. The method as claimed in claim 1, wherein the molding layer comprises a molding sheet, and the molding sheet has a plurality of molding grooves for the grid lines.

7. The method as claimed in claim 6, wherein the forming plate is made of a hard material.

8. The method as claimed in claim 1, wherein the cutting device comprises a laser modulator, the laser modulator is spaced apart from the battery plate, and the laser beam emitted from the laser modulator is opposite to the conductive strip in the thickness direction of the battery plate.

9. The method as claimed in claim 8, wherein the number of the laser beams is equal to the number of the engaging slopes of the zigzag gate line, and the laser beams are used to cut and shape the corresponding engaging slopes.

10. The method as claimed in claim 8 or 9, wherein the cutting device further comprises a support, a cutting platform slidably connected to the support for fixing the battery piece, and a positioning device for positioning the serrated grid line, wherein the laser modulator is mounted on the support and is spaced apart from the cutting platform in a sliding direction.

11. The method as claimed in claim 1, further comprising recovering chips cut from the conductive strip.