Scraper structure

Abstract

The application relates to a scraper structure, which comprises a base body, the base body being a rigid member; and elastic blades connected to one side of the base body, the elastic blades being arranged at intervals, and interval grooves being formed between adjacent elastic blades, wherein the elastic blades correspond to protrusions of a battery piece to be printed, and the interval grooves correspond to grooves of the battery piece to be printed. The uniformity of the surface pressure of the battery piece during silk screen printing by the scraper structure can be improved, thereby greatly reducing the defects such as broken grids and thick grids, and the conductive performance and conversion efficiency of the battery product can be ensured, the production capacity can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a scraper structure. Background Technology

[0002] In the photovoltaic industry and electronic device manufacturing, screen printing, as an efficient and low-cost patterning process, is widely used in key processes such as solar cell grid line preparation and flexible circuit wiring.

[0003] For patterned solar cells, such as TOPCon (Tunnel Oxide Passivated Contact) cells and perovskite cells with grooved and undulating microstructures on the surface, the non-flatness of the surface morphology places extremely high demands on printing precision. Uniform transfer of printing materials is required at the concave and convex structures to ensure the continuity, consistency and conductivity of the grid lines.

[0004] However, existing screen printing squeegees mostly employ a single-planar blade design, which is only suitable for flat battery cells. When applied to the uneven surface of patterned batteries, the uneven pressure distribution easily leads to defects such as broken grids and coarse grids. Typically, the proportion of broken grids exceeds 15%, and the width deviation of coarse grids is more than ±20μm, which seriously affects the conductivity and conversion efficiency of the battery. Utility Model Content

[0005] Therefore, it is necessary to provide a squeegee structure to address the problem that screen printing squeegees, which mostly adopt a single planar blade design, often result in uneven pressure distribution when applied to the uneven surface of patterned batteries, easily leading to defects such as broken or coarse grid lines.

[0006] This application provides a scraper structure, including: a base, the base being a rigid component; and elastic cutting edges connected to one side of the base, wherein multiple elastic cutting edges are spaced apart, and a spacing groove is formed between adjacent elastic cutting edges, wherein the elastic cutting edges correspond to the protrusions of the battery cell to be printed, and the spacing grooves correspond to the grooves of the battery cell to be printed.

[0007] According to one embodiment of this application, the substrate and the elastic cutting edge are separately formed and fixedly connected.

[0008] According to one embodiment of this application, the substrate is detachably fixedly connected to the elastic cutting edge.

[0009] According to one embodiment of this application, the substrate is snapped or magnetically fixed to the elastic cutting edge.

[0010] According to one embodiment of this application, the substrate is an elastic element and is integrally formed with the elastic cutting edge.

[0011] According to one embodiment of this application, a filling portion is provided in the interval groove, and the elastic cutting edge and the filling portion are arranged alternately, wherein the hardness of the filling portion is less than the hardness of the elastic cutting edge.

[0012] According to one embodiment of this application, the filling portion is separately formed from the substrate and the elastic cutting edge, and is fixedly connected to the elastic cutting edge and / or the substrate; or, the filling portion is integrally formed from the elastic cutting edge and / or the substrate.

[0013] According to one embodiment of this application, the Shore hardness of the substrate is 80A-95A, and / or the Shore hardness of the elastic cutting edge is 40A-70A.

[0014] According to one embodiment of this application, along the arrangement direction of the elastic cutting edge, the dimension of the end of the elastic cutting edge away from the substrate is greater than or equal to the dimension of the corresponding protrusion.

[0015] According to one embodiment of this application, on a plane perpendicular to the arrangement direction of the elastic cutting edge, the orthographic projection of the elastic cutting edge is a rectangle, or the orthographic projection of the elastic cutting edge gradually decreases in width from one end near the base to one end away from the base.

[0016] The aforementioned squeegee structure maintains the positional stability of the elastic cutting edge and provides support for it, ensuring sufficient pressure can be applied during screen printing to guarantee the printing effect. The elastic cutting edge corresponds to the protrusions of the battery cell to be printed, allowing pressure to be applied to these protrusions during screen printing to transfer the printing material. The grooves formed between the elastic cutting edges correspond to the grooves of the battery cell to be printed, avoiding excessive deformation of the elastic cutting edge at the groove location due to excessive width or narrowness. This improves the uniformity of pressure on the battery cell surface during screen printing, significantly reducing defects such as broken or coarse grids. This is beneficial for ensuring the conductivity and conversion efficiency of the battery product, increasing production capacity, and reducing production costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram showing the correspondence between the scraper structure and the battery cell in one embodiment of this application.

[0018] Figure 2 This is a front view showing the correspondence between the scraper structure and the battery cell according to an embodiment of this application.

[0019] Figure 3 This is a three-dimensional structural diagram of a scraper structure according to an embodiment of this application.

[0020] Figure 4 This is a frontal projection view of the elastic cutting edge of a scraper structure according to an embodiment of this application on a plane perpendicular to the arrangement direction of the elastic cutting edge.

[0021] Figure 5 This is a frontal projection view of the elastic cutting edge of the scraper structure according to another embodiment of this application on a plane perpendicular to the arrangement direction of the elastic cutting edge.

[0022] Figure 6 This is a frontal projection view of the elastic cutting edge of the scraper structure according to another embodiment of this application on a plane perpendicular to the arrangement direction of the elastic cutting edge.

[0023] Figure label:

[0024] 100. Matrix;

[0025] 200. Flexible cutting edge;

[0026] 300, Spacing groove;

[0027] 400. Filling section;

[0028] 500, battery cell; 510, protrusion; 520, groove. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] Figure 1 This is a three-dimensional schematic diagram showing the correspondence between the scraper structure and the battery cell in one embodiment of this application. Figure 2 This is a front view showing the correspondence between the scraper structure and the battery cell according to an embodiment of this application. Figure 1 The dashed arrows in the diagram represent the correspondence between the elastic cutting edge of the scraper structure and the protrusions of the battery cell.

[0036] Combination Figure 1 and Figure 2 The scraper structure provided in one embodiment of this application includes a base 100 and an elastic cutting edge 200. The elastic cutting edge 200 is connected to one side of the base 100. Multiple elastic cutting edges 200 are spaced apart, and a spacer groove 300 is formed between adjacent elastic cutting edges 200. The elastic cutting edge 200 corresponds to the protrusion 510 of the battery cell 500 to be printed, and the spacer groove 300 corresponds to the groove 520 of the battery cell 500 to be printed.

[0037] The substrate 100 is the basic support component of the scraper structure. The substrate 100 can be made of stainless steel, hard polyurethane, etc., and has a certain rigidity. The elastic cutting edge 200 can be made of silicone, soft polyurethane, etc., and has a certain elasticity. The elastic cutting edge 200 is fixed on the side of the substrate 100 facing the battery cell 500 to be printed. Multiple elastic cutting edges 200 are distributed sequentially and at intervals along the arrangement direction of the protrusions 510 on the surface of the battery cell 500. The gap between two adjacent elastic cutting edges 200 forms a gap groove 300. The width of the gap groove 300 is adapted to the width of the groove 520 on the surface of the battery cell 500, and the width of the elastic cutting edge 200 is adapted to the width of the protrusion 510 on the surface of the battery cell 500.

[0038] The flexible cutting edge 200 can be subjected to laser local high-precision grinding and passivation treatment to make its cutting edge contour more accurately match the shape of the protrusion 510 of the battery cell 500. A buffer layer made of flexible material can be set between the substrate 100 and the flexible cutting edge 200.

[0039] When screen printing is performed, the elastic blade 200 can fully contact the surface of the protrusion 510 of the battery cell 500. Because the elastic blade 200 is elastic, it can adapt to the fine morphology of the surface of the protrusion 510, thereby ensuring uniform printing pressure at the protrusion 510. The spacer groove 300 corresponds to the groove 520 of the battery cell 500, avoiding excessive squeezing or insufficient contact of the squeegee at the groove 520, so that no additional printing defects will be generated at the groove 520 due to the action of the squeegee.

[0040] In addition, the elastic cutting edge 200 corresponds to the protrusion 510, and the spacer groove 300 corresponds to the groove 520, which makes the pressure distribution of the scraper on the uneven surface more reasonable, reducing problems such as grid breakage and coarse grid caused by uneven pressure, thereby ensuring the continuity and consistency of the grid lines, which is beneficial to improving the conductivity and conversion efficiency of the battery.

[0041] In some embodiments, the base 100 and the elastic cutting edge 200 are separately formed and fixedly connected.

[0042] For example, the base 100, as a rigid component, can be made of rigid polyurethane or stainless steel and is manufactured by CNC (Computer Numerical Control), which has high structural strength and stability; the elastic cutting edge 200 is made of silicone or soft polyurethane and is formed by compression molding, and is fixedly connected to the base 100 after molding.

[0043] The separate molding process allows the substrate 100 and the flexible cutting edge 200 to each select the optimal materials and processing techniques according to their respective performance requirements. The rigid substrate 100 provides stable support for the flexible cutting edge 200, preventing overall deformation due to stress during printing and ensuring the positional accuracy of the flexible cutting edge 200. The elastic properties of the flexible cutting edge 200 allow it to adapt to the shape of the protrusion 510 of the battery cell 500. The separate molding and fixed connection of the two not only leverages the rigid support function of the substrate 100 but also utilizes the flexible adaptability of the flexible cutting edge 200. This ensures that the squeegee maintains overall structural stability during printing while achieving good local contact with uneven surfaces, thereby improving the uniformity of printing pressure and reducing printing defects.

[0044] Optionally, the base 100 and the elastic cutting edge 200 are detachably fixedly connected. This detachable connection allows the elastic cutting edge 200 to be replaced individually when it wears down due to long-term use or needs to be adapted to different battery cell structures 500, without replacing the entire scraper, thus reducing operating costs. Simultaneously, it facilitates quick replacement of the corresponding elastic cutting edge 200 according to the uneven shape of different battery cells 500, improving the scraper's versatility and adaptability, shortening equipment setup time, and ultimately enhancing production efficiency.

[0045] For example, the base 100 is snapped or magnetically fixed to the elastic cutting edge 200. The base 100 is provided with a plurality of slots or magnetic seats distributed along its length. The back of the elastic cutting edge 200 is provided with a locking block that matches the slot or a magnetic component that matches the magnetic seat. The elastic cutting edge 200 and the base 100 are detachably connected by the engagement of the locking block and the slot or the attraction of the magnetic component and the magnetic seat. When disassembling, the elastic cutting edge 200 can be separated from the base 100 by applying external force. When installing, it can be fixed by simply aligning the position.

[0046] For example, the base 100 is provided with a T-shaped groove, and the back of the elastic cutting edge 200 is provided with a T-shaped locking block that matches the T-shaped groove. The locking block is inserted and fixed along the length of the groove, and the connection is not easy to loosen.

[0047] For example, the base 100 is made of ferrous metal material, and a permanent magnet is embedded inside the elastic cutting edge 200, or the base 100 and the elastic cutting edge 200 are respectively equipped with mutually attractive permanent magnets, and the two are fixed by magnetic force.

[0048] The snap-fit ​​method ensures the connection strength between the substrate 100 and the elastic cutting edge 200, preventing separation due to force during printing. It also features a simple structure and convenient assembly / disassembly. The magnetic fixing method eliminates the need for complex mechanical structures; installation simply requires placing the elastic cutting edge 200 close to the substrate 100, and disassembly requires only slight force. This method is even simpler and prevents wear on the connection structure due to frequent disassembly / reassembly, extending the service life of both the substrate 100 and the elastic cutting edge 200. Both connection methods ensure the positional stability of the elastic cutting edge 200 during printing, guaranteeing printing accuracy.

[0049] Of course, when the base 100 and the elastic cutting edge 200 are molded separately, the base 100 and the elastic cutting edge 200 can also be fixedly connected by non-removable connection methods such as bonding, which will not be described in detail here.

[0050] In other embodiments, the substrate 100 is an elastic element and is integrally formed with the elastic cutting edge 200.

[0051] In this embodiment, the substrate 100 and the elastic cutting edge 200 can be made of the same or compatible elastic material (such as polyurethane) through a molding process. The hardness of the substrate 100 can be slightly higher than that of the elastic cutting edge 200 to balance overall elasticity and support. After molding, the contour and spacing groove 300 of the elastic cutting edge 200 can be machined by CNC grinding to ensure its compatibility with the uneven surface of the battery cell 500.

[0052] The one-piece molding structure avoids the connection gap between the substrate 100 and the elastic cutting edge 200, making the force transmission more uniform and reducing local deformation caused by uneven force at the connection point. The substrate 100 is an elastic element that can adapt to the deformation together with the elastic cutting edge 200, conforming to the concave and convex shape of the battery cell 500, further improving the fit between the squeegee and the battery surface, thereby making the printing pressure distribution more uniform and reducing the generation of grid line defects. At the same time, the one-piece molding process reduces assembly errors and helps to ensure the dimensional accuracy of the squeegee.

[0053] Combination Figure 3 In some embodiments, a filling portion 400 is provided in the spacer groove 300, and the elastic cutting edge 200 and the filling portion 400 are arranged alternately, and the hardness of the filling portion 400 is less than the hardness of the elastic cutting edge 200.

[0054] In this embodiment, the filling part 400 is made of a material with a hardness lower than that of the elastic cutting edge 200 (such as soft silicone), and is disposed in the spacer groove 300 between two adjacent elastic cutting edges 200, and is arranged alternately with the elastic cutting edges 200 along the arrangement direction; the height of the filling part 400 is slightly lower than the height of the elastic cutting edge 200, and its width matches the width of the spacer groove 300.

[0055] Optionally, the filling part 400 is made of a gradient hardness material, with the hardness gradually decreasing from one side near the elastic cutting edge 200 to the middle part.

[0056] The filling part 400 has low hardness, so it will not put too much pressure on the groove 520 of the battery cell 500 during the printing process. At the same time, it can fill the space in the spacer groove 300, preventing the paste from accumulating excessively in the spacer groove 300. Since the filling part 400 and the elastic blade 200 are arranged alternately, when the squeegee moves, the filling part 400 can play a certain guiding role in the paste near the groove 520. Combined with the printing of the protrusion 510 by the elastic blade 200, the paste distribution on the entire printing surface is more uniform, reducing printing defects caused by paste accumulation or insufficient paste in the groove 520, and improving printing quality.

[0057] Furthermore, when a filling portion 400 is provided within the spacer groove 300, and the elastic cutting edge 200 and the filling portion 400 are arranged alternately, the filling portion 400 can provide support to the elastic cutting edge 200 from the side. When the elastic cutting edge 200 is subjected to a lateral force during the printing process, the filling portion 400 can prevent the elastic cutting edge 200 from shifting into the spacer groove 300, thereby limiting the lateral displacement of the elastic cutting edge 200 and ensuring that it contacts the protrusion 510 of the battery cell 500 to be printed at a preset position.

[0058] In some embodiments, the filling portion 400 is separately formed from the base 100 and the elastic cutting edge 200, and the filling portion 400 is fixedly connected to at least one of the elastic cutting edge 200 and the base 100.

[0059] In this embodiment, after the filling part 400 is separately formed, it is fixedly connected to the side of the elastic cutting edge 200 and the surface of the base 100 by means of such as bonding, snap-fitting or magnetic attraction, or only fixedly connected to the elastic cutting edge 200, or only fixedly connected to the base 100; its processing technology can be independent of the base 100 and the elastic cutting edge 200, and injection molding or compression molding can be selected according to the required performance.

[0060] The split molding process allows the material and size of the filling part 400 to be flexibly adjusted according to the specific parameters of the groove 520 without changing the structure of the base 100 and the elastic cutting edge 200, thus improving the design flexibility of the squeegee. After the filling part 400 is fixedly connected to the elastic cutting edge 200 or the base 100, it can be stably positioned within the spacer groove 300 and will not shift during the printing process, ensuring the stability of the groove 520. At the same time, the split molding process makes it easy to replace the worn filling part 400 individually, reducing maintenance costs.

[0061] In some embodiments, the filling portion 400 is integrally formed with the elastic cutting edge 200.

[0062] In this embodiment, the filling part 400 and the elastic cutting edge 200 are integrally formed by molding. During molding, the alternating elastic cutting edge 200 and filling part 400 structure are directly formed, and there is no obvious connection gap between the two.

[0063] When the filling part 400 and the elastic cutting edge 200 are integrally formed, the hardness of the filling part 400 can be made less than the hardness of the elastic cutting edge 200 by means of the following:

[0064] For example, using the same type of elastic material (such as polyurethane or silicone) but with different formulations, the hardness difference is achieved by adjusting the proportions of components such as crosslinking agents and plasticizers in the material. For instance, in the material corresponding to the filler 400, reducing the amount of crosslinking agent or increasing the content of plasticizer reduces the crosslinking density of the material, thereby reducing its hardness; while in the material corresponding to the elastic cutting edge 200, the opposite formulation adjustment is used to obtain higher hardness.

[0065] For example, a two-color or multi-color co-extrusion molding process is used to mold materials of different hardnesses in the same mold in one step, so that the filling part 400 and the elastic cutting edge 200 form an integral structure, and the two maintain a preset hardness difference. This process can ensure that the filling part 400 and the elastic cutting edge 200 are tightly connected, while maintaining the required hardness characteristics to meet the functional requirements of the spacer groove 300 and the elastic cutting edge 200 respectively adapting to the groove 520 and the protrusion 510 of the battery cell 500.

[0066] The one-piece molding makes the connection between the filling part 400 and the elastic cutting edge 200 stronger, avoiding the filling part 400 from falling off due to force during the printing process; the overall integrity of the two is better, and the force transmission is smoother. When the elastic cutting edge 200 is deformed by pressure, the filling part 400 can deform accordingly, further ensuring the pressure stability in the interval groove 300, which is conducive to the uniform distribution of paste near the groove 520 and improves the printing effect.

[0067] In some embodiments, the filling portion 400 is integrally formed with the substrate 100.

[0068] The filling part 400 and the base 100 are integrally formed using the same rigid or semi-rigid material. When the base 100 is formed, the filling part 400 is directly formed at a preset position. The elastic cutting edge 200 is fixed to the surface of the base 100 between adjacent filling parts 400 by bonding or snapping. The height of the filling part 400 is lower than the height of the elastic cutting edge 200.

[0069] For example, the substrate 100 and the filler portion 400 use the same base material (such as polyurethane), and the hardness difference is achieved by adjusting the material composition. For instance, increasing the proportion of crosslinking agent or using high-hardness additives in the material of the substrate 100 increases its overall hardness; while reducing the amount of crosslinking agent or adding plasticizers in the material corresponding to the filler portion 400 reduces the material hardness. Through two-color injection molding or compression molding, the substrate 100 and the filler portion 400 achieve a gradient change in material during the molding process, forming an integrated structure while maintaining the preset hardness difference.

[0070] The filling part 400 is integrally formed with the base 100, which ensures the structural stability of the filling part 400 and makes it less prone to deformation or displacement due to external forces. The elastic cutting edge 200 is fixed between the filling parts 400, and the filling part 400 can provide lateral support for the elastic cutting edge 200, preventing the elastic cutting edge 200 from tilting laterally during the printing process, ensuring precise contact between the elastic cutting edge 200 and the protrusion 510, thereby improving the stability of printing pressure and printing accuracy.

[0071] Of course, the filling part 400 can also be integrally formed with the elastic cutting edge 200 and the base 100 at the same time, which will not be described in detail here.

[0072] In some embodiments, the filling portion 400 is a porous elastic structure, for example, the filling portion 400 is made of sponge-like silicone material. A negative pressure channel is provided inside the substrate 100, and the negative pressure channel of the substrate 100 communicates with the inner hole of the filling portion 400. During the printing process, the negative pressure channel absorbs excess paste in the groove 520 area through the porous filling portion 400, preventing paste accumulation in the groove 520 and subsequent printing contamination; simultaneously, the elastic buffering effect of the porous structure reduces mechanical damage to the groove 520 by the filling portion 400, improving the integrity of the surface of the battery cell 500.

[0073] In some embodiments, the Shore hardness of the substrate 100 is 80A-95A.

[0074] In this embodiment, the substrate 100 is made of a material with a Shore hardness of 80A-95A (such as rigid polyurethane, stainless steel, etc.). Its specific hardness can be 80A, 83A, 85A, 90A or 95, etc., which are not listed here.

[0075] The substrate 100 within this hardness range can provide sufficient support for the elastic cutting edge 200, ensuring that the elastic cutting edge 200 can accurately act on the protrusion 510 of the battery cell 500 during printing, and that the position of the elastic cutting edge 200 will not shift due to deformation of the substrate 100; at the same time, the high hardness makes the substrate 100 less prone to wear during long-term use, extending the overall service life of the squeegee and ensuring the stability of the printing process.

[0076] Optionally, the substrate 100 is provided with a fiber-reinforced material layer to further improve its rigidity and wear resistance.

[0077] In some embodiments, the Shore hardness of the elastic cutting edge 200 is 40A-70A.

[0078] For example, the elastic cutting edge 200 is made of a material with a Shore hardness of 40A-70A (such as silicone or soft polyurethane). Materials in this hardness range have good elasticity and deformation capacity, and can produce moderate deformation when in contact with the protrusion 510 of the battery cell 500 to conform to the shape of the protrusion 510 surface, while returning to its original shape after the pressure is removed.

[0079] The hardness of the flexible cutting edge 200 can be 40A, 50A, 60A, 70A, etc., which will not be listed here.

[0080] In this embodiment, the elastic cutting edge 200 has moderate hardness, which can generate sufficient deformation to adapt to the fine structure of the protrusion 510 and ensure sufficient contact, while avoiding insufficient pressure due to excessive deformation. During the printing process, the moderate elastic deformation makes the contact area between the elastic cutting edge 200 and the surface of the protrusion 510 more uniform and the pressure distribution more reasonable. This reduces the deformation of the grid lines caused by excessive local pressure or the omission caused by insufficient local pressure, which is conducive to ensuring the quality of the grid lines.

[0081] In some embodiments, the hardness of the end of the elastic cutting edge 200 away from the substrate 100 is less than the hardness of the end closer to the substrate 100.

[0082] For example, the end of the elastic cutting edge 200 away from the substrate 100 and the end close to the substrate 100 are made of materials with different hardness. The end close to the substrate 100 is made of a lower hardness elastic material (such as silicone with a hardness of 40A-50A), and the end away from the substrate 100 is made of a higher hardness elastic material (such as polyurethane with a hardness of 60A-70A). They are connected as a whole by molding or bonding to form a structure in which the hardness gradually increases from the end close to the substrate 100 to the end away from the substrate 100.

[0083] Optionally, a flexible support member can be embedded inside the end closest to the base 100 to further enhance its elastic buffering capacity while ensuring the structural strength of the end away from the base 100.

[0084] The end of the elastic cutting edge 200 facing away from the substrate 100 has higher hardness. When it contacts the protrusion 510 of the battery cell 500 to be printed, it can maintain a better structural shape and is not easily deformed due to compression. This ensures stable printing pressure on the protrusion 510 and is conducive to forming clear and regular grid lines. The end closer to the substrate 100 has lower hardness and better elastic deformation capability. It can play a buffering role when the whole is under force, reducing the impact of printing pressure fluctuations on the overall position of the elastic cutting edge 200 and ensuring its correspondence accuracy with the protrusion 510. This ensures the pressure stability of the printing end and reduces the impact on the surface of the battery cell 500 through elastic buffering at the root, which is beneficial to improving printing quality and reducing damage to the battery cell 500.

[0085] In some embodiments, along the arrangement direction of the elastic cutting edges 200, the dimension of the end of the elastic cutting edge 200 away from the base 100 is greater than or equal to the dimension of the corresponding protrusion 510.

[0086] In this embodiment, along the arrangement direction of the elastic cutting edge 200, the width of the end of the elastic cutting edge 200 away from the substrate 100 is set to be greater than or equal to the width of the corresponding protrusion 510 on the battery cell 500, so as to ensure that the elastic cutting edge 200 can completely cover the surface of the protrusion 510, and its length direction is consistent with the length direction of the protrusion 510, so as to ensure that all parts of the surface of the protrusion 510 can be affected by the elastic cutting edge 200.

[0087] The end size of the elastic blade 200 is sufficient to cover the protrusion 510, so that every part of the surface of the protrusion 510 can be subjected to uniform printing pressure, avoiding the edge of the protrusion 510 being missed or insufficient pressure due to insufficient blade size; at the same time, complete coverage can ensure the uniform distribution of paste on the surface of the protrusion 510, which is conducive to the formation of continuous and complete grid lines and improves the conductivity of the battery.

[0088] Combination Figure 4 In some embodiments, the orthographic projection of the elastic cutting edge 200 on a plane perpendicular to the arrangement direction of the elastic cutting edge 200 is a rectangle.

[0089] On the plane perpendicular to the arrangement direction of the elastic cutting edges 200, the orthographic projection of the elastic cutting edges 200 is rectangular, that is, the two sides of the elastic cutting edges 200 are parallel, the ends are flat, and the cross-sectional shape is regular, which can be formed by CNC grinding during processing.

[0090] The rectangular projection elastic cutting edge 200 has a simple structure and is easy to process, ensuring a stable contact area with the surface of the protrusion 510. During the printing process, the pressure distribution is uniform, reducing local pressure fluctuations caused by the irregular shape of the cutting edge, which helps to ensure the neatness of the grid line edges.

[0091] In other embodiments, on a plane perpendicular to the arrangement direction of the elastic cutting edges 200, the orthographic projection of the elastic cutting edges 200 gradually decreases in width from one end near the base 100 to the other end away from the base 100.

[0092] On a plane perpendicular to the arrangement direction of the elastic cutting edges 200, the orthographic projection of the elastic cutting edges 200 is an inverted trapezoid (see...). Figure 5 ) or inverted triangle (see Figure 6 That is, from one end close to the substrate 100 to the other end away from the substrate 100, the width gradually decreases, and a narrower contact edge is formed at the end. This structure is formed by molding or grinding.

[0093] The width of the elastic cutting edge 200 gradually decreases, making the contact between its end and the surface of the protrusion 510 more concentrated and the pressure easier to control. At the same time, the gradient shape reduces the friction between the elastic cutting edge 200 and the edge of the protrusion 510, reducing mechanical damage to the protrusion 510 structure of the battery cell 500. The narrower end can act more precisely on the surface of the protrusion 510, which is beneficial to improve the fineness of the grid lines, reduce the amount of ink overflowing from the edges, and improve the printing quality.

[0094] Optionally, the end of the flexible cutting edge 200 can be rounded to further reduce wear on the battery cell 500.

[0095] To further understand this utility model, preferred embodiments of this utility model are described below in conjunction with Embodiments 1 and 2. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the scope of the claims of this utility model.

[0096] Example 1

[0097] The scraper structure in this embodiment is applied to the back patterning of TOPCon (Tunnel Oxide Passivated Contact) batteries. The TOPCon battery surface has back contact main grid grooves with a width of 200-500μm and a depth of 1-5μm.

[0098] The scraper structure is made of polyurethane co-extruded, with an elastic cutting edge of 200, a hardness of 60-70 Shore A, and a thickness of 2mm.

[0099] Contouring cutting edge: The flexible cutting edge 200 is CNC-carved with an arc contour, with a radius of curvature R=0.2μm.

[0100] Verification has shown that using the scraper structure of this embodiment for back-side graphic structure printing reduces grid breakage rate by 70%, improves grid line width consistency by 50%, and increases battery conversion efficiency by 0.02%.

[0101] Example 2

[0102] The scraper structure in this embodiment is applied to a flexible perovskite solar cell. The surface of the flexible perovskite solar cell has a micron-level wavy structure with an amplitude of ±30μm.

[0103] A substrate 100 with a hardness of 80 Shore A and an elastic cutting edge 200 with a hardness of 40 Shore A are magnetically combined. A filling part 400 is provided in the spacer groove 300, and the arrangement of the elastic cutting edge 200 and the filling part 400 is switched according to the shape of the battery (e.g., the elastic cutting edge 200 and the filling part 400 alternate).

[0104] The printing pressure is 60N.

[0105] Verification has shown that when printing flexible perovskite solar cells using the scraper structure of this embodiment, the flexible substrate suffers zero damage, and the rate of grid line breakage is reduced.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A scraper structure, characterized in that, include: The substrate is a rigid component; An elastic cutting edge is connected to one side of the substrate. Multiple elastic cutting edges are spaced apart, and a spacer groove is formed between adjacent elastic cutting edges. The elastic cutting edges correspond to the protrusions of the battery cell to be printed, and the spacer grooves correspond to the grooves of the battery cell to be printed.

2. The scraper structure according to claim 1, characterized in that, The substrate and the elastic cutting edge are separately formed and fixedly connected.

3. The scraper structure according to claim 2, characterized in that, The base is detachably fixedly connected to the elastic cutting edge.

4. The scraper structure according to claim 3, characterized in that, The substrate is engaged or magnetically fixed to the elastic cutting edge.

5. The scraper structure according to claim 1, characterized in that, The substrate is an elastic element and is integrally formed with the elastic cutting edge.

6. The scraper structure according to any one of claims 1 to 5, characterized in that, The spacer groove is provided with a filling part, and the elastic cutting edge and the filling part are arranged alternately. The hardness of the filling part is less than the hardness of the elastic cutting edge.

7. The scraper structure according to claim 6, characterized in that, The filling portion is separately formed from the substrate and the elastic cutting edge, and is fixedly connected to the elastic cutting edge and / or the substrate; or, The filling portion is integrally formed with the elastic cutting edge and / or the substrate.

8. The scraper structure according to any one of claims 1 to 5, characterized in that, The substrate has a Shore hardness of 80A-95A, and / or the elastic cutting edge has a Shore hardness of 40A-70A.

9. The scraper structure according to any one of claims 1 to 5, characterized in that, Along the arrangement direction of the elastic cutting edges, the dimension of the end of the elastic cutting edge opposite to the substrate is greater than or equal to the dimension of the corresponding protrusion.

10. The scraper structure according to any one of claims 1 to 5, characterized in that, On a plane perpendicular to the arrangement direction of the elastic cutting edges, the orthographic projection of the elastic cutting edges is a rectangle, or the orthographic projection of the elastic cutting edges gradually decreases in width from one end closer to the base to the other end away from the base.

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