Scraper plate for printing solar cells

Abstract

The utility model relates to the technical field of battery piece printing, in particular to a scraping plate for solar battery piece printing. The scheme of the embodiment of the utility model is mainly characterized by comprising an outward convex step on the front side of the scraper body and an inward concave arc-shaped structure on the lower end surface of the step. A storage space is formed by the structure, and a certain amount of slurry can be temporarily stored in the printing process; the storage capacity ensures continuous supply of the printing material; meanwhile, redundant slurry can be effectively collected and reused, and the utilization rate of materials is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell printing, and particularly relates to a squeegee for printing solar battery cells. Background Art

[0002] In the solar cell industry, the screen printing process is a key step in forming the grid lines and aluminum back field of battery cells. In this process, the squeegee (also called the blade) plays a crucial role in printing quality control. The traditional printing process relies on the pressure between the squeegee and the screen to penetrate the paste through the mesh holes onto the surface of the silicon wafer, thus completing the printing.

[0003] However, the existing squeegees for battery cell printing have a simple structure and lack an effective paste control mechanism. During the printing process, the excess paste is prone to spread to other areas of the squeegee, causing waste and affecting the printing quality. This not only increases the production cost but also reduces the performance and consistency of the battery cells.

[0004] The above problems restrict the improvement of the production efficiency and product quality of solar battery cells. Therefore, there is an urgent need for a new squeegee design that can effectively control the paste distribution while simplifying the installation and adjustment process. Summary of the Utility Model

[0005] To solve the above problems, the utility model discloses a squeegee for printing solar battery cells.

[0006] [[ID=2L]]To achieve the above object, the present application discloses a squeegee for printing solar battery cells, comprising:

[0007] A squeegee body, on the front side of which there is a step protruding outwards, and the step is located above the working part at the bottom end of the squeegee body;

[0008] The lower end surface of the step is a concave arc surface.

[0009] On one side of the top end of the squeegee body, there is a first positioning inclined surface extending downwards obliquely, and a connecting screw hole is opened in the first positioning inclined surface in the vertical direction, and the first positioning inclined surface is used to cooperate with a second positioning inclined surface in the squeegee mounting bracket.

[0010] In a possible implementation manner, a separation membrane is detachably attached to the squeegee body, and the separation membrane covers the front side of the squeegee body.

[0011] Wherein, the upper end of the separation membrane is provided with a taking edge bent outwards.

[0012] In a specific solution, a clamping groove that is inserted and matched with the top end of the squeegee body is provided in the squeegee mounting bracket. The second positioning inclined surface is located in the clamping groove. An installation hole is provided in the squeegee mounting bracket corresponding to the connection screw hole. When installing the squeegee, it is installed and fixed by screwing a screw rod between the installation hole and the connection screw hole.

[0013] In addition, a plurality of raised strips are arranged along the length direction of the working part at the bottom end of the squeegee body.

[0014] The protruding heights of the plurality of raised strips increase sequentially from front to back.

[0015] The main features of the solution in the embodiment of the present application include an outwardly protruding step on the front side of the squeegee body and an inwardly concave arc structure on the lower end surface of the step. This structure forms a material storage space, which can temporarily store a certain amount of slurry during the printing process; this storage capacity ensures the continuous supply of printing materials; at the same time, it can effectively collect and reuse the excess slurry and improve the material utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of a squeegee for printing solar cell wafers in the embodiment of the present application

[0017] Figure 2 It is a schematic diagram of the overall structure of a squeegee for printing solar cell wafers in the embodiment of the present application;

[0018] Figure 3 It is a partial schematic diagram of a squeegee for printing solar cell wafers in the embodiment of the present application;

[0019] Figure 4 It is a schematic diagram of the installation and cooperation between a squeegee for printing solar cell wafers and a squeegee mounting bracket in the embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of the structure of a separation membrane in the embodiment of the present application;

[0021] Figure 6 For Figure 3 side view;

[0022] Figure 7 It is a schematic diagram of the position of the raised strips in Embodiment 3 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further clarified below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0024] Embodiment 1: As Figure 1 shown, a squeegee for printing solar cell wafers includes:

[0025] A squeegee body 100, on the front side of the squeegee body 100, there is a step 101 protruding outward, and the step 101 is located above the bottom working part 102 of the squeegee body 100;

[0026] In a possible implementation manner, the step 101 is arranged on the front side of the squeegee body 100, and a step 101 protruding outward is arranged at a position about 10 - 15 mm away from the bottom working part 102. The height of the step 101 is about 0.5 - 1 mm, and the width is 1 - 2 mm. The step 101 extends along the entire length of the squeegee body 100.

[0027] When the squeegee moves, the step 101 can block the excess slurry and prevent it from spreading to other areas on the squeegee body 100.

[0028] The lower end surface of the step 101 is a concave arc surface. The surface tension is used to make the slurry adhere to the concave arc surface, and the concave arc surface can better store the slurry and form a small "slurry storage pool". This structure forms a storage space, which can temporarily store a certain amount of slurry during the printing process; this storage capacity ensures the continuous supply of printing materials; at the same time, it can effectively collect and reuse the excess slurry and improve the material utilization rate.

[0029] As Figure 2 and 6 shown, on one side of the top end of the squeegee body 100, there is a first positioning inclined surface 103 extending downward obliquely, and a connecting screw hole 104 is opened vertically on the first positioning inclined surface 103. The first positioning inclined surface 103 is used to cooperate with a second positioning inclined surface 106 in the squeegee mounting frame 105.

[0030] In a specific solution, on one side of the top end of the squeegee body 100, there is a first positioning inclined surface 103 inclined downward at an angle of about 30 - 45 degrees, and the length is about 20 - 30 mm. On the first positioning inclined surface 103, a connecting screw hole 104 with a diameter of 4 - 6 mm is opened every 50 mm vertically.

[0031] Among them, a card slot 109 into which the top end of the scraper body 100 is inserted and fitted is provided in the scraper mounting bracket 105. The second positioning inclined surface 106 is located in the card slot 109. An installation hole 110 is provided in the scraper mounting bracket 105 corresponding to the connection screw hole 104. Specifically, an installation hole 110 with a diameter of 6 - 8 mm is provided at the position of the connection screw hole 104 on the scraper mounting bracket 105.

[0032] During installation, insert the top end of the scraper body 100 into the card slot 109 so that the first positioning inclined surface 103 is in close fit with the second positioning inclined surface 106. Then screw the screw 111 into the connection screw hole 104 through the installation hole 110 to fix the scraper.

[0033] The first positioning inclined surface 103 and the second positioning inclined surface 106 form a wedge fit, which can automatically adjust to the best position during installation. At the same time, it can increase the contact area between the two, improve the stability of the scraper, and reduce vibration.

[0034] Example 2: As Figures 4 - 5 shown, in order to facilitate the cleaning of the surface of the scraper body 100, a separation membrane 107 is detachably attached to the scraper body 100, and the separation membrane 107 covers the front side of the scraper body 100.

[0035] In a possible implementation, the separation membrane 107 can be made of polytetrafluoroethylene (PTFE) or polyimide (PI) film with high temperature resistance and chemical corrosion resistance; thickness: 0.05 - 0.2 mm.

[0036] A reusable low-strength adhesive is used to ensure that the separation membrane 107 can be firmly attached and easily disassembled. At the same time, micro-positioning protrusions or grooves can be provided at the edge of the front side of the scraper body 100 to assist in the accurate positioning of the separation membrane 107.

[0037] The separation membrane 107 serves as a replaceable protective layer and covers the front side of the scraper body 100. After printing, only the separation membrane needs to be replaced, and there is no need to clean the entire scraper.

[0038] In addition, a take-up edge 108 that bends outward is provided at the upper end of the separation membrane 107. The take-up edge that bends outward provides an easy-to-grab part for the operator, facilitating the quick replacement of the separation membrane.

[0039] Example 3: As Figure 7 shown, in addition, a plurality of raised strips 112 are provided along the length direction of the working part 102 at the bottom end of the scraper body 100.

[0040] In a specific solution, 3 - 5 raised strips 112 can be provided, which can be adjusted according to the length of the squeegee and printing requirements. The cross - sectional shape is semi - circular or triangular, and the top is rounded. The width of each raised strip is 0.5 - 1.5 mm.

[0041] Multiple raised strips 112 form a multi - scraping surface, and the slurry will be redistributed when passing through each raised strip. Multiple scrapings can better evenly distribute the slurry and reduce the situation of uneven thickness.

[0042] The protruding heights of the multiple raised strips 112 increase successively from front to back. In a possible implementation, the height of the front - end (near the front side of the squeegee) raised strip is 0.1 - 0.3 mm; the height of the back - end (far from the front side of the squeegee) raised strip is 0.3 - 0.8 mm; the height increase method can adopt linear increase or non - linear increase (such as exponential increase); the overall height difference is between 0.2 - 0.5 mm.

[0043] The height design that increases from front to back creates a progressive pressure distribution. The low front - end raised strip initially evenly distributes the slurry, and the high back - end raised strip further precisely controls the thickness. The progressive height helps prevent the slurry from accumulating excessively at the front end of the squeegee.

[0044] The technical means disclosed in the solution of the present utility model is not limited to the technical means disclosed in the above - mentioned embodiments, but also includes technical solutions composed of any combination of the above - mentioned technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A squeegee for printing solar cell wafers, characterized in that , including: A scraper body (100), a step (101) protruding outward is arranged on the front side of the scraper body (100), and the step (101) is located above the working part (102) at the bottom end of the scraper body (100); The lower end surface of the step (101) is a concave arc surface.

2. The scraper according to claim 1, wherein , on one side of the top end of the scraper body (100), there is a first positioning inclined surface (103) extending downward obliquely, a connecting screw hole (104) is opened in the first positioning inclined surface (103) along the vertical direction, and the first positioning inclined surface (103) is used to cooperate with the second positioning inclined surface (106) in the scraper mounting bracket (105).

3. The squeegee according to claim 1, characterized in that , a separation membrane (107) is detachably attached to the scraper body (100), and the separation membrane (107) covers the front side surface of the scraper body (100).

4. The squeegee according to claim 3, wherein , an extraction edge (108) bent outward is arranged at the upper end of the separation membrane (107).

5. The squeegee according to claim 2, wherein , a clamping groove (109) inserted and matched with the top end of the scraper body (100) is arranged in the scraper mounting bracket (105), the second positioning inclined surface (106) is located in the clamping groove (109), and a mounting hole (110) corresponding to the connecting screw hole (104) is opened on the scraper mounting bracket (105). When installing the scraper, it is installed and fixed by screwing a screw (111) between the mounting hole (110) and the connecting screw hole (104).

6. The squeegee according to claim 1, wherein , a plurality of protruding strips (112) are arranged along the length direction of the working part (102) at the bottom end of the scraper body (100).

7. The squeegee according to claim 6, wherein , the protruding heights of the plurality of protruding strips (112) increase sequentially from front to back.

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