Battery piece screen printing plate
By designing parallel grid lines and oblique edge laying at the chamfers of the cell screen, the contact area is increased, and the problem of grid lines falling off at the chamfers is solved, and the yield and product performance of the cell are improved.
Patent Information
- Application Number
- CN202422098014.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2035-06-04
AI Technical Summary
During the screen printing process of existing battery cell screens, the gate lines at the chamfers protrude, which makes it easy to fall off when the battery cells are stacked and packaged, affecting product yield and performance.
A cell mesh plate is designed. The two gate lines at the chamfers are laid along the direction of the oblique extension and parallel to the oblique edge, with an angle of 90-180 degrees and a line width of 10-14 microns. It increases the contact area between the gate lines and the mesh plate, reduces slurry accumulation, and reduces the height of the gate lines at the chamfers.
By increasing the contact area between the gate line and the screen, the adhesion ability of the gate line is improved, the probability of the gate line falling off at the chamfer is reduced, and the yield and product performance of the battery cell are improved.
Smart Images
Figure CN223080418U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery wafers, in particular to a battery wafer screen printing stencil. Background Art
[0002] The current collection and conduction of existing N-type TOPCon batteries are mainly completed through conductive grid lines. Among them, the conductive grid lines are prepared by screen printing silver paste. During the screen printing process, in order to make the paste cover the printing graphic area of the screen printing stencil, it is necessary to increase the amount of paste added in the screen printing stencil. After the squeegee spreads the paste evenly on the screen printing stencil, the excess paste accumulates under the squeegee at the printing starting position.
[0003] When starting to print, the squeegee first presses down to the specified position and then moves horizontally to one side. At the starting position, due to the self-weight of the paste and the downward pressure, the downward filling force of the paste at this position is much greater than that at the other printing positions. As a result, the height of the grid lines at the chamfer after actual printing is not less than 20μm, and the height of the conventional grid lines is 7-9μm. Therefore, the height of the grid lines at the chamfer is much higher than that at other positions. When the battery wafers are stacked and packaged, due to the protrusion of the grid lines at the chamfer, when the higher grid lines are subjected to lateral friction during the stacking of the battery wafers, the tangential stress is relatively large. As a result, the tangential stress at the position where the higher grid lines contact the screen printing stencil is relatively large, so that the friction between the battery wafers easily causes the grid lines at the chamfer to fall off, which seriously affects the product yield and product performance. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a battery wafer screen printing stencil to solve the technical problem that the grid lines at the chamfer are prone to falling off.
[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0006] A battery wafer screen printing stencil includes a screen printing stencil and a plurality of grid lines. The screen printing stencil has four chamfers, and the four chamfers are respectively arranged at the four corners of the screen printing stencil. Each chamfer has two hypotenuses, and the included angle between the two hypotenuses is 90-180 degrees; the plurality of grid lines are sequentially and spacedly arranged on the surface of the screen printing stencil, and the two grid lines at the chamfer are laid along the extending direction of the hypotenuse, and the two grid lines at the chamfer are respectively parallel to the two hypotenuses.
[0007] In some embodiments, the included angle between the two hypotenuses is 90 degrees.
[0008] In some embodiments, the lengths of the two grid lines at the chamfer are both 25-30 microns.
[0009] In some embodiments, the lengths of the two grid lines at the chamfer are both 25 microns.
[0010] In some embodiments, the line widths of the two grid lines at the chamfer are both 10-14 micrometers.
[0011] In some embodiments, the line widths of the two grid lines at the chamfer are both 13 micrometers.
[0012] Compared with the prior art, the advantages of the present utility model are as follows:
[0013] In the present utility model, through the angle between the two oblique lines and the setting of the line widths of the two oblique lines, the contact area between the grid lines and the stencil is relatively large. At the same time, the contact area between the paste and the silicon wafer is increased. With the paste having the same corrosion resistance, the adhesion ability of the grid lines can be greatly improved. Furthermore, the adhesion ability of the grid lines at the chamfer is relatively strong, and the height of the grid lines at the chamfer is reduced. As a result, when the solar cells are stacked, the tangential stress generated by the friction on the grid lines at the chamfer of the stencil is relatively small, and thus the probability of the grid lines at the chamfer of the stencil falling off is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0015] Figure 1 FIG. is a front view of the solar cell stencil of Embodiment 1;
[0016] Figure 2 For Figure 1 the enlarged view of reference numeral A in the figure;
[0017] Figure 3 FIG. is a front view of the solar cell stencil of Embodiment 2;
[0018] Figure 4 For Figure 3 the enlarged view of reference numeral B in the figure;
[0019] Reference numerals:
[0020] 100 - stencil, 110 - chamfer, 111 - bevel edge,
[0021] 200 - grid line. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0023] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0024] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0025] In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0026] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0027] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, terms such as "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0028] It should be noted that the features in the embodiments of the present utility model can be combined with each other without conflict.
[0029] Embodiment 1
[0030] It should be understood that in the prior art, when stacking and packaging solar cells, due to the prominent height of the grid lines at the chamfer, the friction between the solar cells easily causes the grid lines at the chamfer to fall off, seriously affecting the product yield and performance.
[0031] To improve the above problems, as Figure 1 - Figure 2 shown, this embodiment provides a screen plate for solar cells, mainly including a screen plate 100 and multiple grid lines 200. This device is mainly used to reduce the height of the grid lines 200 at the chamfer 110, so as to avoid the situation where the grid lines 200 at the chamfer 110 fall off due to easy friction between the solar cells when stacking and packaging the solar cells because of the prominent height of the grid lines 200 at the chamfer 110.
[0032] As Figure 1 - Figure 2 shown, in this embodiment, multiple grid lines 200 are arranged at intervals on the screen plate 100. Among them, the setting position, arrangement order, length, etc. of the grid lines 200 on the screen plate 100 are all in the prior art, so no more details will be described here.
[0033] In this embodiment, the screen plate 100 has four chamfers 110, which are respectively arranged at the four corners of the screen plate 100. The chamfer 110 has two hypotenuses 111, and the included angle between the two hypotenuses 111 is 90 - 180 degrees. Preferably, the included angle between the two hypotenuses 111 is 90 degrees. Thus, when preparing the grid lines 200 by printing silver paste on the screen plate 100, while ensuring the same amount of silver paste, the contact area between the silver paste and the screen plate 100 increases, so that the silver paste accumulated under the squeegee, that is, the silver paste accumulated under the initial position of the squeegee, decreases. Furthermore, the amount of paste during printing by the squeegee decreases, so that the amount of paste for the grid lines 200 formed at the chamfer 110 decreases, and then the height of the grid lines 200 at the chamfer 110 decreases. Therefore, when stacking and packaging the solar cells, due to the reduced height of the grid lines 200 at the chamfer 110, the tangential stress on the grid lines 200 at the chamfer 110 is lower, so that the probability of the grid lines 200 at the chamfer falling off is lower.
[0034] At the same time, the grid lines 200 at the chamfer 110 are laid along the laying directions of the two hypotenuses at the chamfer 110, that is, the grid lines 200 at the chamfer 110 are parallel to the two hypotenuses at the chamfer 110. Since the included angle between the chamfers 110 is 90 degrees, the total length of the grid lines 200 at the chamfer 110 is longer than the length of the grid lines 200 when no included angle is set. Thus, the contact area between the grid lines 200 at the chamfer 110 and the screen plate 100 increases, and then the adhesion ability of the grid lines 200 is stronger. Furthermore, the probability of the grid lines 200 at the chamfer 110 falling off is lower, and then the yield of the solar cells is higher. And because the grid lines 200 do not fall off, the performance of the product is stable.
[0035] In some embodiments, the lengths of the two grid lines 200 at the chamfer 110 are both 25 - 30 microns. Specifically, the lengths of the two grid lines 200 closest to the chamfer 110, that is, the two grid lines 200 parallel to the two hypotenuses, are 25 - 30 microns. Preferably, the lengths of the two grid lines 200 are both 25 microns. As a result, the contact area between the two grid lines 200 at the chamfer 110 and the stencil 100 is relatively large, so that the adhesion ability of the grid lines 200 is relatively strong, and thus the probability of the grid lines 200 falling off is relatively low.
[0036] In some embodiments, the line widths of the two grid lines 200 at the chamfer 110 are both 10 - 14 microns. Preferably, the line widths of the two grid lines 200 at the chamfer 110 are both 14 microns. As a result, the contact area between the two grid lines 200 at the chamfer 110 and the stencil 100 is relatively large, so that the adhesion ability of the grid lines 200 is relatively strong, and thus the probability of the grid lines 200 falling off is relatively low.
[0037] In this embodiment, the line width of the two grid lines 200 at the chamfer 110 is 14 microns. While making the contact area between the grid lines 200 and the stencil 100 relatively large, the area of the stencil surface blocked by the grid lines 200 is relatively small, so that the proportion of incident light is relatively high.
[0038] In this embodiment, the line widths of the grid lines 200 at other positions can also be set to 10 - 14 microns according to requirements, so that the area of the stencil surface is relatively small, and thus the proportion of incident light is relatively high.
[0039] Embodiment 2
[0040] As Figure 3 - Figure 4 shown, a plurality of chamfers 110 are provided at the four corners of the stencil 100, and the plurality of chamfers 110 at one corner of the same stencil 100 are continuously arranged in a stepped manner. Among them, the angle between the two hypotenuses 111 of the chamfer 110 is 90 - 180 degrees. Preferably, the angle between the two hypotenuses 111 of the chamfer 110 is 90 degrees. Specifically, the two grid lines 200 at the chamfer 110 are parallel to the two hypotenuses 111, so that the lengths of the two grid lines 200 at the chamfer 110 are relatively long, and thus the contact area between the grid lines 200 and the stencil 100 is relatively large, so that the adhesion ability of the two grid lines 200 at the chamfer 110 is relatively strong.
[0041] In this embodiment, the line widths of the two grid lines 200 at the chamfer 110 are 10 - 14 microns. Preferably, the line width of the grid lines 200 is 13 microns. As a result, the contact area between the grid lines 200 and the stencil 100 is relatively large, so that the adhesion ability of the two grid lines 200 at the chamfer 110 is relatively strong, and thus the probability of the grid lines 200 falling off is relatively low.
Claims
1. A solar cell screen printing stencil (100), comprising a stencil (100) and a plurality of grid lines (200), characterized in that: The stencil (100) has four chamfers (110), and the four chamfers (110) are respectively arranged at the four corners of the stencil (100). The chamfer (110) has two hypotenuses (111), and the included angle between the two hypotenuses (111) is 90 - 180 degrees; A plurality of the grid lines (200) are sequentially arranged at intervals on the surface of the stencil (100), and the two grid lines (200) at the chamfer (110) are laid along the extending direction of the hypotenuse (111), and the two grid lines (200) at the chamfer (110) are respectively parallel to the two hypotenuses (111).
2. The battery cell screen printing stencil (100) according to claim 1, characterized in that: The included angle between the two hypotenuses (111) is 90 degrees.
3. The battery cell screen printing stencil (100) according to claim 1, characterized in that: The lengths of the two grid lines (200) at the chamfer (110) are both 25 - 30 microns.
4. The battery cell stencil (100) according to claim 3, characterized in that: The lengths of the two grid lines (200) at the chamfer (110) are both 25 microns.
5. The battery cell screen printing stencil (100) according to claim 1, characterized in that: The line widths of the two grid lines (200) at the chamfer (110) are both 10 - 14 microns.
6. The battery cell screen printing stencil (100) according to claim 5, characterized in that: The line widths of the two grid lines (200) at the chamfer (110) are both 13 microns.