阅读说明：本技术 一种电池片丝网印刷装置、方法及叠瓦组件的加工工艺 (Battery piece screen printing device and method and machining process of tile folding assembly ) 是由 李迅 丁二亮 孙俊 尹丙伟 周华明 石刚 李岩 于 2021-06-24 设计创作，主要内容包括：本申请实施例提供一种电池片丝网印刷装置、方法及叠瓦组件的加工工艺,涉及光伏电池制备技术领域。电池片丝网印刷装置包括丝印平台和设置于丝印平台上的丝印网版,丝印网版具有若干条平行设置的网孔线,所有网孔线相对于丝印网版同向的中心线对称设置,丝印网版上还设置有刮刀,刮刀被配置成能够垂直抵持于若干条相对于丝印网版同向的中心线对称设置的网孔线,且能够沿网孔线的方向刮动。本申请实施例的丝印网版上的网孔线相对于丝印网版的中心线对称,根据网孔线对应布置电池片,电池片的主栅线相对于丝印网版的中心线对称,印刷出的胶线重量均匀；电池片受力均匀,有效降低丝印网版爆裂风险和电池片隐裂风险。(The embodiment of the application provides a cell screen printing device and method and a machining process of a tile folding assembly, and relates to the technical field of photovoltaic cell preparation. The battery piece silk screen printing device comprises a silk screen printing platform and a silk screen printing plate arranged on the silk screen printing platform, wherein the silk screen printing plate is provided with a plurality of parallel mesh lines, all the mesh lines are symmetrically arranged relative to the homodromous central line of the silk screen printing plate, a scraper is further arranged on the silk screen printing plate, and the scraper is configured to vertically support the plurality of mesh lines symmetrically arranged relative to the homodromous central line of the silk screen printing plate and can scrape along the direction of the mesh lines. The mesh lines on the silk-screen printing plate are symmetrical relative to the central line of the silk-screen printing plate, the battery pieces are correspondingly arranged according to the mesh lines, the main grid lines of the battery pieces are symmetrical relative to the central line of the silk-screen printing plate, and the weight of the printed glue lines is uniform; the stress on the battery piece is even, and the risk of cracking of the silk screen printing plate and the risk of hidden cracking of the battery piece are effectively reduced.)

1. The utility model provides a cell screen printing device, its characterized in that, it includes the silk screen printing platform with set up in silk screen printing screen on the silk screen printing platform, silk screen printing screen has a plurality of parallel arrangement's mesh line, all mesh lines for the central line symmetry of silk screen printing screen syntropy sets up, still be provided with the scraper on the silk screen printing screen, the scraper is configured to can support perpendicularly and hold in a plurality of for the mesh line that the central line symmetry set up, and can follow the direction of mesh line is scraped.

2. A cell screen printing apparatus as claimed in claim 1, wherein the number of the mesh lines is 3 to 10; and/or the distance between any two adjacent mesh lines is equal.

3. The cell screen printing device of claim 1, wherein all the mesh lines are symmetrically arranged relative to a center line of the scraper in the same direction, the distance of the scraper beyond the outermost mesh line is not less than 15mm, and/or the screen printing plate is located in the center of a screen printing platform, and the center line of the screen printing plate is coincident with the center line of the screen printing platform in the same direction.

4. A cell screen printing method based on the cell screen printing device of claim 1, which is used for printing glue lines on main grid lines of a plurality of cells simultaneously, and is characterized in that the cell screen printing method comprises the following steps:

arranging a plurality of battery pieces on the screen printing platform, and spreading and covering the screen printing plate on the battery pieces, wherein the main grid line of each battery piece corresponds to one mesh line, and the main grid lines of all the battery pieces are symmetrical relative to the central line of the screen printing plate;

abutting and arranging a scraper on the silk-screen printing plate coated with the glue solution, so that the scraper is perpendicular to the mesh lines and abuts against all the mesh lines corresponding to the main grid lines;

and the scraper is abutted against the silk-screen printing plate and is scraped along the direction of the mesh lines until the glue solution penetrates through the mesh lines and is printed on the corresponding main grid lines to form the glue lines.

5. The cell screen printing method of claim 4, wherein the number of the cells is 3-10, the distance between any two adjacent main grid lines is equal, and the main grid lines of all the cells correspond to the continuously arranged mesh lines on the screen printing plate.

6. The screen printing method for the battery piece according to claim 4, wherein the projection of the mesh line on the battery piece is positioned in the corresponding main grid line, and the distance between the projection end part of the mesh line and the end part of the corresponding main grid line at the same end is 1-1.5 mm.

7. The cell screen printing method of claim 4, wherein all the main grid lines are symmetrically arranged relative to a center line of the scraper in the same direction, and the distance of the scraper exceeding the outermost main grid line is not less than 15 mm.

8. The cell slice screen printing method according to claim 4, wherein the screen printing plate covers all the cells, and the edge of the cell slice closest to the edge of the screen printing plate is 5-30 mm.

9. The cell screen printing method of claim 4, wherein the scraper is driven by a constant pressure cylinder, and/or the pressure of the scraper on the screen printing plate is 0.06-0.1 MPa.

10. The machining process of the laminated tile assembly is characterized by comprising the following steps of:

the method for screen printing of battery plates according to claim 4, wherein the main grid lines of a plurality of battery plates are glued to form glue lines, and then the battery plates are overlapped in a tile-type manner and are bonded together through the glue lines.

Technical Field

The application relates to the technical field of photovoltaic cell preparation, in particular to a cell screen printing device and method and a processing technology of a tile folding assembly.

Background

The photovoltaic module absorbs sunlight and directly or indirectly converts solar radiation energy into electric energy through a photoelectric effect or a photochemical effect. The processing technology of the photovoltaic module is an important component of a solar energy industrial chain, and the fragile solar cell pieces are packaged, so that the photovoltaic module can reliably run under severe outdoor conditions. In order to improve the utilization rate of sunlight in a unit area, the cell small pieces can be combined together to form a laminated tile assembly by adopting a laminated tile technology. The processing technology of the tile-folded assembly is to cut a whole solar cell into a plurality of small cells, overlap and bond partial regions of the cells with better consistency together, and then package the cells. The front main grid lines are arranged on the edges of the front sides of the battery pieces of the laminated assembly, the back main grid lines are arranged on the corresponding edges of the back sides, when the two battery pieces are overlapped in a laminated manner, the front main grid lines of one battery piece are overlapped with the back main grid lines of the other battery piece and are bonded through glue lines, and current conduction between the pieces is guaranteed. In the process of manufacturing the laminated assembly, the main grid lines (front main grid lines or back main grid lines) of each cell are coated with glue to form glue lines, and then the glue lines are stacked and bonded.

At present, a silk-screen printing device 10 shown in fig. 1 is generally adopted to simultaneously perform silk-screen printing on a plurality of battery slices 01, the silk-screen printing device 10 comprises a silk-screen platform 11, each battery slice 01 is laid on the silk-screen platform 11 according to the same direction, and main grid lines 02 of each battery slice 01 are parallel to each other and are offset relative to the central line of the silk-screen platform 11. The battery pieces 01 are covered with the silk-screen printing plate 12, the silk-screen printing plate 12 just covers all the battery pieces 01, the structure of the silk-screen printing plate 12 is shown in fig. 2, the structure of the silk-screen printing plate 12 is provided with mesh wires 13 corresponding to the main grid lines 02, and the mesh wires 13 are offset relative to the central line of the silk-screen printing plate 12 and are also offset relative to the central line of the silk-screen platform 11. When the silk-screen printing device 10 is used for silk-screen printing of the main grid lines 02 of the battery pieces 01, the silk-screen printing plate 12 is firstly coated with the glue solution, the scraper 14 perpendicular to the mesh lines 13 on the silk-screen printing plate 12 is used for abutting against the silk-screen printing plate 12, and the glue solution is scraped along the direction of the mesh lines 13, so that the glue solution is printed on the main grid lines 02 through the meshes on the mesh lines 13 to form the glue lines.

The printing method using the screen printing plate with the mesh lines offset relative to the central line has the following problems: the whole main grid line/mesh line is offset towards one side relative to the central line of the silk-screen printing plate, and the pressures of the silk-screen printing plate on the main grid line are inconsistent during printing, so that the difference of printing effects on two sides is large, the weight difference of printed glue lines is too large, and the glue weight is serious; the main grid line of the battery piece is offset relative to the central line of the silk screen printing plate, the silk screen printing plate is partially suspended, the silk screen printing plate has a bursting risk, the pressure of the silk screen printing plate on the battery piece is uneven, the battery piece has a hidden cracking risk, and the main grid line cannot adapt to the thinning and cost reduction trend of the battery piece.

Disclosure of Invention

The embodiment of the application aims to provide a battery piece screen printing device and method and a machining process of a tile folding assembly, wherein during screen printing, mesh lines on two sides of a central line of a screen printing plate are uniformly tensioned, and printed glue lines are uniform in weight; the stress of the battery piece is even, the cracking risk of the silk screen printing plate and the hidden cracking risk of the battery piece are effectively reduced, and the thin-sheet-type battery piece stress reduction trend is adapted.

In a first aspect, an embodiment of the present application provides a battery piece screen printing device, which includes a screen printing platform and a screen printing plate disposed on the screen printing platform, wherein the screen printing plate has a plurality of parallel mesh lines, all the mesh lines are symmetrically disposed with respect to a center line of the screen printing plate in the same direction, a scraper is further disposed on the screen printing plate, and the scraper is configured to vertically support the plurality of mesh lines symmetrically disposed with respect to the center line and can scrape the battery piece along the direction of the mesh lines.

In the implementation process, the mesh lines on the screen printing plate are symmetrical relative to the central line of the screen printing plate, the battery pieces are correspondingly arranged according to the mesh lines, the screen printing plate covers all the battery pieces, and the main grid lines of the battery pieces are also symmetrical relative to the central line of the screen printing plate. When the screen printing plate with the symmetrically arranged mesh lines is used for screen printing the battery piece, the main grid lines/the mesh lines are symmetrically arranged instead of being offset towards one side from the original whole body relative to the central line of the screen printing plate, and the printing of the mesh lines (namely screen printing mesh areas) is changed from the original offset printing towards one side to the centered printing. When a scraper is used for uniformly applying force to the silk screen plate for printing, the main grid lines of the battery piece support the mesh lines of the silk screen plate, the rest areas of the silk screen plate are in a suspended state, the tension on the mesh lines on the two sides of the central line of the silk screen plate is more uniform, the risk of bursting of the silk screen plate caused by unbalanced tension on the silk screen plate is avoided, the weight of the printed glue lines is more uniform, and the problem that the glue weight difference on the two sides of the printed central line is too large is effectively solved; the mesh lines are symmetrically arranged in the middle relative to the center line of the silk screen printing plate, the battery pieces are placed in the middle, the stress of the battery pieces is uniform, the hidden crack risk of the battery pieces is effectively reduced, and the thin-sheet battery piece reducing trend is adapted.

In one possible implementation, the number of mesh lines is 3-10; and/or the distance between any two adjacent mesh lines is equal.

In the implementation process, the mesh wires are symmetrically and uniformly arranged relative to the central line of the silk screen printing plate, correspondingly, the battery pieces are also symmetrically and uniformly arranged, the weight of the printed glue line is more uniform, and the bursting risk of the silk screen printing plate and the hidden cracking risk of the battery pieces are further reduced.

In a possible implementation mode, all the mesh wires are symmetrically arranged relative to the center line of the scraper in the same direction, the distance of the scraper beyond the mesh wire at the outermost side is not less than 15mm, and/or the silk screen is positioned in the center of the silk screen platform, and the center line of the silk screen coincides with the center line of the silk screen platform in the same direction.

In the implementation process, the scrapers are symmetrically arranged relative to the central line of the silk screen printing plate, so that the uniform and balanced force application to the silk screen printing plate, especially to the mesh line area is ensured, the length of the scrapers is properly increased, the scrapers exceed the mesh line on the outermost side by a certain distance, the uniformity of the tension borne by the silk screen printing plate is improved during silk screen printing, and the bursting risk of the silk screen printing plate is reduced. The silk screen printing plate is arranged in the middle relative to the silk screen platform, and the uniformity of silk screen glue lines can be ensured.

In a second aspect, an embodiment of the present application provides a battery piece screen printing method based on the battery piece screen printing apparatus provided in the first aspect, and the method is used for printing glue lines on main grid lines of a plurality of battery pieces at the same time, and the battery piece screen printing method includes the following steps:

arranging a plurality of battery pieces on a screen printing platform, and spreading and covering a screen printing plate on the battery pieces, wherein the main grid line of each battery piece corresponds to one mesh line, and the main grid lines of all the battery pieces are symmetrical relative to the central line of the screen printing plate;

abutting and arranging a scraper on the silk-screen printing plate coated with the glue solution, so that the scraper is perpendicular to the mesh lines and abuts against all the mesh lines corresponding to the main grid lines;

and the scraper is pressed against the silk-screen printing plate to scrape along the direction of the mesh lines until the glue solution penetrates through the mesh lines and is printed on the corresponding main grid lines to form the glue lines.

In the implementation process, the mesh lines are symmetrically arranged relative to the center line of the screen printing plate, and the main grid lines supporting the battery cells of the screen printing plate are also symmetrically distributed in the center relative to the center line. When the scraper is enabled to abut against the silk screen printing plate to scrape, the tension force applied to all the mesh wires is ensured to be uniform, the risk of bursting of the silk screen printing plate caused by unbalanced tension force applied to the silk screen printing plate is avoided, the weight of the printed glue wires is uniform, the risk of hidden cracking of the battery piece is effectively reduced, and the trend of thinning and reducing the cost of the battery piece is adapted.

In a possible implementation mode, the number of the battery pieces is 3-10, the distance between any two adjacent main grid lines is equal, and the main grid lines of all the battery pieces correspond to the continuously arranged mesh lines on the silk-screen printing plate.

In the implementation process, 3-10 battery pieces can be printed at one time according to requirements, the main grid lines are symmetrical relative to the center line of the silk screen printing plate and are continuously and uniformly stepped, and the silk screen grids and the battery pieces are uniformly stressed.

In a possible implementation manner, the projection of the mesh line on the battery piece is located in the corresponding main grid line, and the distance between the projection end part of the mesh line and the end part of the corresponding main grid line is 1-1.5 mm.

In the implementation process, the printed glue line is ensured to be on the main grid line corresponding to the battery piece, and the distance between the end part of the glue line on the main grid line and the end part of the same end of the main grid line is 1-1.5 mm.

In a possible implementation mode, all the main grid lines are symmetrically arranged relative to the center line of the scraper in the same direction, and the distance of the scraper exceeding the main grid line on the outermost side is larger than or equal to 15 mm.

In the implementation process, the scrapers are arranged in a specific mode, the length of each scraper is increased to enable the scraper to exceed the main grid line on the outermost side by a certain distance, the uniformity of pressure borne by the battery piece during printing is improved, and the hidden cracking risk of the battery piece is reduced.

In a possible implementation mode, the silk-screen plate covers all the battery pieces, and the edge of the silk-screen plate closest to the edge of the battery piece is 5-30 mm.

In the implementation process, the uniformity of the pressure of the silk-screen printing plate on all the battery pieces is ensured.

In a possible implementation mode, the scraper is driven by a constant-pressure air cylinder, and/or the pressure of the scraper on the screen printing plate is 0.06-0.1 MPa.

In the implementation process, the scraper is driven by a constant-pressure cylinder mode and is used for stabilizing the acting force of the scraper on the screen printing plate, so that the tension of the screen printing plate is uniformly distributed all the time during printing, and the printed glue lines are uniformly distributed along the length direction (scraping direction) of the glue lines.

In a third aspect, an embodiment of the present application provides a process for machining a laminated tile assembly, which includes the following steps:

according to the screen printing method for the battery pieces, glue is applied to the main grid lines of the plurality of battery pieces to form glue lines, and then the battery pieces are overlapped in a laminated manner and are bonded together through the glue lines.

In the implementation process, the battery piece screen printing device for the battery pieces is uniform in glue applying, hidden cracking risks are reduced, and the bonding effect and the yield between the battery pieces of the laminated tile assembly are guaranteed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a battery plate after a silk-screen printing device in the prior art is adopted to print glue lines on the battery plate;

fig. 2 is a schematic structural diagram of the silk-screen printing plate in fig. 1;

fig. 3 is a schematic structural diagram of a battery cell screen printing process for printing a glue line on the battery cell according to the first embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of the silk-screen printing plate in fig. 3;

fig. 5 is a schematic structural diagram of a battery cell screen printing glue line provided in a second embodiment of the present application.

Icon: 01-a battery piece; 02-main grid line; 10-screen printing device; 11-a screen printing platform; 12-screen printing plate; 13-mesh line; 14-a scraper; 100-cell screen printing device; 110-a screen printing platform; 120-silk screen printing plate; 121-mesh line; 130-a scraper; 200-cell screen printing device; 210-a silk-screen platform; 220-screen printing plate; 221-mesh line; 230-doctor blade.

Detailed Description

In the process of implementing the application, the applicant finds that: the current laminated photovoltaic module processing technology generally adopts an EVA (ethylene vinyl acetate) adhesive film to package a battery piece, and the packaging technology comprises a plurality of procedures of battery piece detection, battery piece printing adhesive lines, battery piece lamination, module lamination, frame installation, junction box installation, finished product testing, packaging and warehousing and the like. In order to reduce the use of silver paste and reduce the cost of a battery piece in recent years, and meanwhile, in order to improve the effective power generation area of a photovoltaic battery piece, grid lines on the battery piece are thinner, the effect of printing glue lines and unit consumption uniformity of the existing printing process cannot meet the quality requirement, and the problems of virtual printing, glue point missing and the like exist, so that the product quality is influenced.

Because the main grid lines of the cells of the tiled photovoltaic module are arranged at the edges, specifically, one long edge of the front side of each cell and the other long edge of the back side of each cell, when two cells are overlapped in a tiled mode, the main grid lines of the front side of one cell are overlapped with the main grid lines of the back side of the other cell and are bonded through glue lines, and therefore, the glue lines need to be printed on the main grid lines of the front side and/or the back side of each cell in advance. As shown in fig. 1, in order to print a plurality of glue lines on the battery pieces 01 with the offset main grid lines 02, a silk screen 12 is needed, in order to print as many battery pieces 01 as possible, the battery pieces 01 are conventionally spread over the whole silk screen platform 11, the silk screen 12 capable of just covering all the battery pieces 01 is arranged on the battery pieces 01, and the mesh lines 13 of the silk screen 12 are offset relative to the central line. In the process of printing the glue lines on the battery piece 01, the silk-screen printing plate 12 and the main grid line 02 are scraped back and forth by the scraper 14 to perform glue line printing, and the glue dot printing effect is mainly controlled by the depth of the scraper and the distance between the silk-screen printing plates. However, the silk-screen printing glue line for the battery plate 01 by adopting the silk-screen printing device 10 mainly has the following defects: the screen printing mesh line 13 is wholly biased to one side, and the glue line is unevenly tensioned by the screen printing plate, so that the weight difference of the glue lines printed on the left side and the right side is overlarge, and the glue weight unevenness degree is serious; the central line of the screen printing platform 11 and the central line of the screen printing plate 12 are mutually offset, the local part of the screen printing plate in the effective printing area is suspended, and the screen printing plate 12 has the risk of cracking.

Therefore, in the future trend of reducing cost for thin sheets, the requirements for the screen printing process are increased again, and the prior art is difficult to meet. In order to solve the problems that the tension of the screen printing plate on two sides of a screen printing mesh line is uneven, the printing uniformity of a single-group battery piece is poor and the like, the applicant explores a special screen printing plate and a corresponding screen printing device.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product of the application is conventionally placed in use, which are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description of the present application, it should be noted that "a plurality" means a positive integer of 3 or more in number.

First embodiment

Referring to fig. 3 and 4, the battery sheet screen printing apparatus 100 provided in this embodiment includes a screen printing platform 110 and a screen printing plate 120 disposed on the screen printing platform 110, the screen printing plate 120 has a plurality of parallel mesh lines 121, all the mesh lines 121 are symmetrically disposed with respect to a center line of the screen printing plate 120 in the same direction, a scraper 130 is further disposed on the screen printing plate 120, and the scraper 130 is configured to vertically abut against the plurality of mesh lines 121 symmetrically disposed with respect to the center line of the screen printing plate 120 in the same direction, and can scrape along the direction of the mesh lines 121.

The screen printing device 100 for the battery piece in the embodiment of the application is mainly used for printing the battery piece with a single main grid line on a single surface of the battery piece, and printing glue lines on the main grid lines of the battery piece, for example, a laminated tile battery piece of a laminated tile assembly, wherein the main grid lines are arranged on the long edge of the front surface and the long edge of the back surface of the battery piece. Each mesh line 121 on the screen printing plate 120 may correspond to one main gate line of one battery cell, that is, the battery cell is disposed between the screen printing platform 110 and the screen printing plate 120, and the projection of each mesh line 121 on the corresponding battery cell is just located on the corresponding main gate line. The mesh line 121 is a linear region formed by arranging a plurality of meshes, each mesh can penetrate through the glue solution to form glue dots, and all the glue dots form the glue line.

In order to ensure the uniformity of the force applied by the scraper 130 to the screen printing plate 120, in the embodiment of the present application, the screen printing plate 120 is located at the center of the screen printing platform 110, and the scraper 130 is also symmetrically arranged along the center. In this embodiment, the center line of the screen printing plate 120 coincides with the center line of the screen printing platform 110 in the same direction, specifically, the center line of the screen printing plate 120 in the same direction as the mesh line 121 coincides with the center line of the screen printing platform 110 in the same direction as the mesh line 121; all the mesh lines 121 are symmetrically arranged relative to the centre line of the doctor blade 130 in the same direction, and the centre line of the doctor blade 130 in the same direction as the mesh lines 121 also coincides with the two centre lines.

In order to ensure that all the cells are uniformly stressed, all the cells are completely covered by the silk-screen printing plate 120; because the pressure of the scraper 130 acts on the main grid lines, only the scraper 130 is required to be capable of pressing all the mesh lines 121, and the distance of the scraper 130 exceeding the outermost mesh line 121 is not less than 15mm, and all the areas of all the battery pieces do not need to be pressed.

In the embodiment of the application, the number of the mesh lines 121 is 3-10, that is, 3-10 rubber lines can be printed on 3-10 battery pieces at the same time; and the distance between any two adjacent grid lines 121 is equal, so that the battery pieces of the same specification can be arranged between the screen printing platform 110 and the screen printing plate 120 in the same manner (same position and same distance), and each grid line corresponds to one main grid line of one battery piece. In this embodiment, the screen printing plate 120 has 6 mesh lines 121, and 6 glue lines can be printed at the same time.

In this embodiment, the screen printing plate 120 of the battery piece screen printing device 100 is placed on the screen printing platform 110 in the middle, the battery piece is placed along with the screen printing plate, the center line of the screen printing platform 110 coincides with the center line of the screen printing plate 120 and the center line of the scraper 130, and the mesh lines 121 on both sides of the center line are more uniformly tensioned during printing, so that the problem of uneven weight of glue lines on both sides after printing can be effectively solved, meanwhile, the stress uniformity of the battery piece is improved, the device is suitable for flaking, and hidden cracking risks are effectively avoided. Compared with the original screen printing device for printing 6 battery pieces with the same specification, the embodiment appropriately enlarges the screen printing plate 120, increases the length of the scraper 130, and can improve the uniformity of the screen printing glue lines.

In addition, the present embodiment further provides a battery piece screen printing method based on the above battery piece screen printing apparatus 100, which is used for printing glue lines on the main grid lines of a plurality of battery pieces at the same time, that is, printing the glue lines on the main grid lines on the front surface of the battery pieces by using a screen printing method. The screen printing method of the battery piece comprises the following steps:

and S1, detecting and positioning the defects of the battery pieces through the CCD, accurately arranging a plurality of qualified battery pieces on the screen printing platform 110 by using a robot, laying and covering the screen printing plate 120 on the battery pieces, wherein the main grid line of each battery piece corresponds to one mesh line 121, and the main grid lines of all the battery pieces are symmetrical relative to the central line of the screen printing plate 120.

In the embodiment of the application, the arrangement number of the battery pieces may be determined according to requirements, for example, the number of the battery pieces is 3 to 10, and it is only necessary to satisfy that the main grid lines are symmetrical with respect to the center line of the screen printing plate 120, for example, one battery piece is correspondingly arranged on each mesh line 121 on each side of the center line, or one battery piece may be correspondingly arranged at intervals of one mesh line 121. In this embodiment, the distances between any two adjacent main grid lines are equal, and the main grid lines of all the battery pieces correspond to the mesh lines 121 continuously arranged on the screen printing plate 120.

In this embodiment, the projections of the mesh lines 121 on the battery piece are located in the corresponding main grid lines, and the distance from the projection end portions of the mesh lines 121 to the corresponding main grid lines and the end portions of the same ends is 1-1.5mm, in this embodiment, the distance is 1.25 mm.

In the embodiment of the application, the silk-screen 120 covers all the battery pieces, and the edge of the silk-screen 120 closest to the edge of the battery piece is 5-30 mm.

S2, abutting and arranging a scraper 130 on the silk-screen printing plate 120 coated with the glue solution on the mesh lines 121 corresponding to the main grid lines, enabling the scraper 130 to be perpendicular to the mesh lines 121 and abut against all the mesh lines 121 coated with the glue solution, symmetrically arranging all the main grid lines relative to the center line of the scraper 130 in the same direction, and enabling the distance between the scraper 130 and the main grid line at the outermost side to be larger than or equal to 15 mm.

In the embodiment of the application, the glue solution can be conductive glue or non-conductive glue, and the glue solution is an organic silicon system glue, an epoxy resin system glue or an acrylic acid system glue.

In the embodiment of the application, before the glue is used, the cold-stored glue is taken out in advance and is cooled back for standby; extruding the glue with good temperature return into the silk-screen printing plate 120, uniformly covering the mesh wires 121 of the silk-screen printing plate 120, and weighing the silk-screen printing glue; after the adhesive weight is determined to be qualified, the battery piece is loaded, and the step S1 is performed.

S3, the scraper 130 is scraped along the direction of the mesh line 121 by the screen printing plate 120 until the glue solution penetrates through the mesh line 121 and is printed on the corresponding main grid line to form a glue line, and glue application is completed, wherein the distance from the end of the glue line on the main grid line to the end of the same end of the main grid line is 1.25 mm.

In the embodiment of the present application, the scraper 130 only needs to be capable of vertically abutting against the mesh lines 121 of the corresponding battery piece, and the mesh lines 121 may be all the mesh lines 121, or some of the mesh lines 121 symmetrically arranged with respect to the center line of the screen printing plate 120 in the same direction. In this embodiment, the scraper 130 vertically abuts against all the mesh wires 121.

In this embodiment, the scraper 130 is driven by a constant pressure cylinder, and the pressure of the scraper 130 on the screen printing plate 120 is 0.06-0.1 MPa.

In this embodiment, a monitoring device is added after sizing for monitoring the sizing quality. The glue missing, printing deviation, printing glue weight and glue shape and size can be monitored and analyzed, and analysis processing is carried out according to the monitoring result.

In addition, the embodiment provides a processing technology of a laminated tile assembly, which includes the following steps:

according to the cell screen printing method, glue is applied to main grid lines on the front faces of a plurality of cells to form glue lines, then the cells are overlapped in a tiling mode and are bonded together through the glue lines, specifically, the head ends and the tail ends of the cells form basic structural units of a photovoltaic module in a serial, parallel or serial-parallel combination mode, and then the tiling module is formed through module laminating, frame sealing, wiring and other steps.

Second embodiment

Referring to fig. 5, the structure of a battery sheet screen printing apparatus 200 provided in this embodiment is substantially the same as that of the first embodiment, and includes a screen printing platform 210 and a screen printing plate 220 disposed on the screen printing platform 210, the screen printing plate 220 has a plurality of parallel mesh lines 221, all the mesh lines 221 are symmetrically disposed with respect to a center line of the screen printing plate 220 in the same direction, a scraper 230 is further disposed on the screen printing plate 220, and the scraper 230 is configured to vertically abut against the plurality of mesh lines 221 symmetrically disposed with respect to the center line of the screen printing plate 220 in the same direction, and can scrape along the direction of the mesh lines 221.

In this embodiment, the screen printing plate 220 has 5 mesh lines 221, and the middle mesh line 221 is located exactly on the central line of the screen printing plate 220. Each mesh line 221 corresponds to a main grid line of one cell. Correspondingly, the specifications of the screen printing platform 210, the screen printing plate 220 and the scraper 230 are adjusted correspondingly to meet the actual use requirements.

In summary, during the silk-screen printing of the embodiment of the application, the mesh wires on the two sides of the center line of the silk-screen plate are uniformly tensioned, and the printed glue wires are uniform in weight; the stress of the battery piece is even, the cracking risk of the silk screen printing plate and the hidden cracking risk of the battery piece are effectively reduced, and the thin-sheet-type battery piece stress reduction trend is adapted.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.