An extrusion coating die shoe

Abstract

The utility model discloses an extrusion coating die pad, include: gasket body, two end portions of gasket body extend horizontally along the width direction of gasket body and form two groups of symmetrical gasket connecting parts, and the one end of each group gasket connecting part is connected with gasket head part, and the flow blocking part is formed on gasket head part, the area formed between gasket head part, gasket connecting part and gasket body constitutes rectangular runner, and the discharge port of rectangular runner is formed between two flow blocking parts, two groups of arc baffle, two groups of arc baffle are placed respectively on the inner wall both sides of gasket body, and are connected with gasket connecting part, be provided with arc section on arc baffle, and arc section is towards discharge port. The utility model discloses through to the optimization of gasket structure, make the pressure and flow velocity of slurry in the middle and both sides of cavity keep consistent, thereby reach the purpose of optimizing the consistency of extrusion coating transverse surface density.

Description

Technical Field

[0001] This utility model relates to the field of electrode material manufacturing technology in the lithium battery manufacturing industry, and in particular to an extrusion coating die pad. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, extrusion coating is often used to coat the battery substrate. The coating die head includes an upper die and a lower die, with a gasket sandwiched between the upper and lower dies. The gasket has a discharge port, and there is a pressure chamber inside the die head. Under certain pressure, the slurry is extruded from the discharge port and uniformly coated onto the substrate.

[0003] Because the slurry inlet of the extrusion coating die is located at the middle tail, the slurry fills the entire die head and forms a stable pressure, and then is extruded outward from the opening of the slit gasket; the screw pump of the coating machine continuously and stably fills the cavity with slurry. The fixed feeding mode causes the slurry flow rate in the middle of the die head cavity near the inlet to be different from that on both sides, which creates a pressure difference. Ultimately, this results in the gap coating being arc-shaped laterally, causing the coating to have a "thick edge phenomenon" (the slurry flow rate in the edge area is too fast, and the coating thickness is higher than that in the center area).

[0004] Existing gasket structures are fixed and cannot dynamically adapt to slurries of different viscosities (such as low-viscosity solvent-based slurries and high-viscosity solid electrolytes). This requires frequent replacement of gaskets or die heads, increasing downtime and costs. Traditional integrated gaskets need to be replaced as a whole after wear, resulting in long maintenance times and high costs. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an extrusion coating die gasket. By optimizing the structure of the gasket, this invention ensures that the pressure and flow rate of the slurry in the middle and on both sides of the cavity are consistent, thereby achieving the goal of optimizing the consistency of the surface density in the transverse direction of the extrusion coating.

[0006] To achieve the above objectives, this utility model provides an extrusion coating die pad, comprising:

[0007] The gasket body has two sets of symmetrical gasket connecting parts extending horizontally along the width direction at both ends. Each set of gasket connecting parts is connected to a gasket head at the end away from the gasket body. A flow-blocking part is formed on the gasket head. The area formed between the gasket head, the gasket connecting part, and the gasket body constitutes a rectangular flow channel. The outlet of the rectangular flow channel is formed between the two flow-blocking parts.

[0008] Two sets of arc-shaped baffles are respectively placed on both sides of the inner wall of the gasket body and connected to the gasket connecting part. The arc-shaped baffles are provided with arc-shaped parts facing the discharge port.

[0009] Furthermore, the arc-shaped baffle also includes a first connecting portion and a second connecting portion. The first connecting portion is detachably connected to the gasket connecting portion, and the second connecting portion is detachably connected to the gasket body. This detachable connection facilitates the replacement of arc-shaped baffles with different radii of curvature to adapt to the coating requirements of slurries of different viscosities, thereby dynamically adjusting the slurry flow rate distribution and improving the thick edge phenomenon caused by flow rate differences.

[0010] Furthermore, the arc-shaped baffle is integrally formed with the gasket connection part and the gasket body.

[0011] Furthermore, the radius of curvature R of the arc-shaped portion is 5mm to 50mm. The size of the radius of curvature can be dynamically adapted according to the viscosity of the slurry. A smaller radius of curvature is suitable for low-viscosity slurries to increase the flow resistance of the slurry in the edge area and suppress the thick edge phenomenon; a larger radius of curvature is suitable for high-viscosity slurries to reduce flow resistance and ensure uniform discharge.

[0012] Furthermore, the maximum thickness of the arc-shaped baffle is 1 / 3 to 1 / 2 of the depth of the discharge port. This design effectively avoids the problem of slurry flow obstruction caused by excessive thickness of the arc-shaped baffle, while taking into account both structural strength and adjustment effect. This results in uniform slurry flow rate distribution during coating, significantly improves the lateral uniformity of the coating, and enhances the coating quality and production efficiency of battery electrodes.

[0013] Furthermore, the inclination angle θ of the arc-shaped portion is 10°~45°. The inclination angle design provides a certain guiding effect when the slurry flows through the arc-shaped portion. By adjusting the inclination angle of the arc-shaped baffle, the flow direction and speed of the slurry in the outlet area can be effectively controlled, thereby improving the coating quality.

[0014] Furthermore, the surface smoothness RA of the arc-shaped portion is ≤0.8μm.

[0015] Furthermore, the thickness of the gasket body is 0.1mm to 2mm.

[0016] Furthermore, a slider with dimensional graduations is movably mounted on the head of the gasket. During installation, it is accurately installed according to the required coating width. The size of the opening can be controlled by moving it left and right, thereby controlling the cavity pressure.

[0017] Furthermore, the two ends of the gasket body are provided with outwardly protruding ears, which are used to fine-tune the installation position of the gasket body.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The utility model incorporates arc-shaped baffles on both sides of the lower end of the gasket body. After the slurry enters the die cavity, it is guided by the arc-shaped baffles, and the flow path on both sides is extended, forming local resistance. This causes the slurry to flow tangentially, reducing turbulence and lowering the flow velocity on both sides, while relatively increasing the flow velocity in the central area. This balances the overall pressure distribution, thereby improving coating uniformity, eliminating thick edge phenomena, and increasing the electrode / film layer qualification rate from 90% to 98% (based on a coating defect rate of <0.5%).

[0020] The radius of curvature (R) and tilt angle (θ) of the arc baffle can be flexibly adjusted according to the viscosity of the slurry, eliminating the need for frequent replacement of gaskets or die head structures. It supports a wide range of compatibility from low-viscosity solvent-based slurries (1000 mPa·s) to high-viscosity solid electrolytes (50000 mPa·s), reducing the frequency of downtime adjustments and improving the overall equipment efficiency (OEE) by 15%.

[0021] The split baffle and gasket structure of this implementation supports quick replacement, reducing maintenance time by 50%; the baffle surface polishing treatment (Ra≤0.8μm) reduces slurry residue and lowers the cleaning frequency. Attached Figure Description

[0022] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an extrusion coating die pad according to the present invention;

[0024] Figure 2 This is a schematic diagram of the arc-shaped baffle of this utility model;

[0025] Figure 3 This is a schematic diagram of the slider of this utility model.

[0026] The diagram includes:

[0027] 1. Gasket body; 11. Mounting hole; 12. Gasket connecting part; 13. Gasket head; 14. Baffle part; 15. Discharge port; 16. Rectangular flow channel; 17. Ear position; 2. Arc-shaped baffle; 21. Arc-shaped part; 22. First connecting part; 23. Second connecting part; 3. Slider; 31. Dimension scale; A1. Gasket body axis. Detailed Implementation

[0028] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0031] like Figures 1 to 3 The present invention discloses an extrusion coating die pad, comprising a pad body 1, an arc-shaped baffle 2, and a slider 3;

[0032] Example 1

[0033] like Figure 1 As shown, the gasket body 1 of this embodiment is provided with a plurality of mounting holes 11, wherein the thickness of the gasket body 1 is 0.1mm~2mm. Figure 1 The horizontal direction is the length direction of the gasket body 1, and the vertical direction is the width direction of the gasket body 1. The two ends of the gasket body 1 extend horizontally along the width direction to form two sets of symmetrical connecting portions 12, as shown below. Figure 1 The gasket body has a central axis A1, and two sets of connecting parts 12 are symmetrically arranged around the central axis A1. The structures and arrangements of the two sets of connecting parts 12 are exactly the same. In this embodiment, the end of each set of gasket connecting parts 12 away from the gasket body is connected to a gasket head 13. The gasket head 13 is provided with a flow-blocking part 14, which is respectively placed on both sides of the central axis A1 of the gasket body and arranged opposite to each other, as shown in the figure. The area formed between the gasket head 13, the gasket connecting part 12 and the gasket body 1 forms a rectangular flow channel 16. The outlet 15 of the rectangular flow channel 16 is formed between the two left and right flow-blocking parts 14. The two ends of the gasket body 1 are provided with outwardly protruding ears 17, which are used to fine-tune the installation position of the gasket body.

[0034] In this embodiment, two sets of arc-shaped baffles 2 are respectively placed on both sides of the inner wall of the gasket body 1 and connected to the gasket connecting part 12, as shown in the figure below. Figure 1 As shown, two sets of arc-shaped baffles 2 are symmetrically arranged on the left and right sides below the rectangular flow channel 16. Arc-shaped portions 21 are provided on the arc-shaped baffles 2, which face the discharge port 15. The smoothness RA of the surface of the arc-shaped portion 21 is ≤0.8μm. In particular, the arc-shaped portion 21 of the arc-shaped baffle 2 is inclined, with an inclination angle θ of 10°~45°. The design of the inclination angle of the arc-shaped portion 21 gives the slurry a certain guiding effect when it flows through the arc-shaped portion 21. By adjusting the inclination angle of the arc-shaped baffle 2, the flow direction and speed of the slurry in the area of ​​the discharge port 15 can be effectively controlled, thereby improving the coating quality. The specific value of θ can be determined according to the viscosity of the slurry. For example, the value of θ can be set to 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°.

[0035] In some preferred embodiments, the radius of curvature R of the arc-shaped portion 21 can be set to 5mm~50mm. The size of the radius of curvature can be dynamically adapted according to the viscosity of the slurry. A smaller radius of curvature is suitable for low-viscosity slurries to increase the flow resistance of the slurry in the edge area and suppress the thick edge phenomenon; a larger radius of curvature is suitable for high-viscosity slurries to reduce flow resistance and ensure uniform discharge. Therefore, arc-shaped baffles 2 with different radii of curvature R can be selected for different slurry viscosities to optimize the slurry flow performance. For example, arc-shaped baffles 2 with R of 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm or 50mm can be selected to meet the coating requirements under different process conditions.

[0036] like Figure 1 As shown, the maximum thickness H1 of the arc-shaped baffle 2 is 1 / 3 to 1 / 2 of the depth of the outlet 15. This setting can effectively avoid the problem of slurry flow obstruction caused by excessive thickness of the arc-shaped baffle 2, while taking into account structural strength and adjustment effect. This ensures uniform slurry flow rate distribution during coating, significantly improves the lateral uniformity of the coating, and enhances the coating quality and production efficiency of battery electrode sheets.

[0037] In this embodiment, the arc-shaped baffle 2 and the gasket body 1 adopt a split structure. Specifically, the arc-shaped baffle 2 includes a first connecting part 22, a second connecting part 23, and an arc-shaped part 21. The first connecting part 22 is detachably connected to the gasket connecting part 12, and the second connecting part 23 is detachably connected to the gasket body 1. The detachable connection between the first connecting part 22 and the second connecting part 23 is locked by a bolt. Of course, in some embodiments, a slot can be provided on the gasket body 1 to directly snap the arc-shaped baffle 2 into place. This detachable connection makes it easy to replace the arc-shaped baffle 2 with different radii of curvature to meet the coating requirements of slurries with different viscosities, thereby dynamically adjusting the slurry flow rate distribution and improving the thick edge phenomenon caused by flow rate differences.

[0038] In this embodiment, to further adjust the coating width, the slider 3 is movably mounted on the pad head 13. The slider 3 can slide and be fixed on the pad head 13 in the lateral direction to achieve precise adjustment of the coating width. The slider 3 and the pad head 13 are connected by a groove, that is, a groove is opened on the pad head 13, and the slider 3 is embedded in the groove. The position of the slider can be fixed by setting bolts or other limiting structures or limiting parts to ensure that the slider will not be displaced during the coating process. A size scale 31 is set on the slider 3 so that the operator can make precise adjustments according to the actual coating width requirements.

[0039] Example 2

[0040] In other embodiments, in high-speed coating scenarios for a single material (such as PE film for photovoltaic backsheets), the arc-shaped baffle 2 can be integrally formed with the gasket connection part 12 and the gasket body 1, and its radius of curvature R and tilt angle θ are fixed. This fixed parameter design for a single material can greatly improve the stability of equipment operation and production efficiency, while reducing the risk of equipment wear and process fluctuations caused by frequent parameter adjustments.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A gasket for an extrusion coating die, characterized in that, include: The gasket body (1) has two sets of symmetrical gasket connecting parts (12) extending horizontally along the width direction of the gasket body (1) at both ends. Each set of gasket connecting parts (12) is connected to a gasket head (13) at the end away from the gasket body (1). A flow-blocking part (14) is formed on the gasket head (13). The area formed between the gasket head (13), the gasket connecting part (12) and the gasket body (1) forms a rectangular flow channel (16). The outlet (15) of the rectangular flow channel (16) is formed between the two flow-blocking parts (14). Two sets of arc-shaped baffles (2) are respectively placed on both sides of the inner wall of the gasket body (1) and connected to the gasket connecting part (12). The arc-shaped baffles (2) are provided with arc-shaped parts (21) facing the discharge port (15).

2. The extrusion coating die pad according to claim 1, characterized in that, The arc-shaped baffle (2) further includes a first connecting part (22) and a second connecting part (23). The first connecting part (22) is detachably connected to the gasket connecting part (12), and the second connecting part (23) is detachably connected to the gasket body (1).

3. The extrusion coating die pad according to claim 1, characterized in that, The arc-shaped baffle (2) is integrally formed with the gasket connection part (12) and the gasket body (1).

4. A gasket for an extrusion coating die according to any one of claims 2 or 3, characterized in that, The radius of curvature R of the arc-shaped part (21) is 5mm~50mm.

5. A gasket for an extrusion coating die according to any one of claims 2 or 3, characterized in that, The maximum thickness of the arc-shaped baffle (2) is 1 / 3 to 1 / 2 of the depth of the discharge port (15).

6. A gasket for an extrusion coating die according to any one of claims 2 or 3, characterized in that, The inclination angle θ of the arc-shaped part (21) is 10°~45°.

7. A gasket for an extrusion coating die according to any one of claims 2 or 3, characterized in that, The surface smoothness RA of the arc-shaped part (21) is ≤0.8μm.

8. The extrusion coating die pad according to claim 1, characterized in that, The thickness of the gasket body (1) is 0.1mm to 2mm.

9. The extrusion coating die pad according to claim 1, characterized in that, A slider is movably disposed on the head (13) of the gasket, and the slider is provided with size scale (31).

10. The extrusion coating die pad according to claim 1, characterized in that, The two ends of the gasket body (1) are provided with outwardly protruding ear positions (17).

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