A gasket for a coating die, a coating die, and a coating apparatus

Abstract

The utility model discloses a kind of gasket for coating die, coating die and coating equipment, belong to battery coating technical field, including being located between main gasket of upper die and lower die, main gasket is provided with coating area and the non-coating area of both sides located in coating area, the non-coating area is provided with the hollow runner extending along the non-coating area direction close to the coating area, the non-coating area is also provided with the resistance between the coating area and the hollow runner It is located between the resistance and the first recess portion on the side of the hollow runner away from the coating area, wherein the clearance between the resistance and the upper die and / or the lower die, the clearance is used to make slurry from the coating area permeate to the hollow runner, and the hollow runner guides the slurry and is discharged through the first recess portion. The utility model reaches in wide die coating narrow width coating process, avoid slurry overflow to coating main roll, while it is favorable to reduce the technical effect of cost.

Description

Technical Field

[0001] This utility model belongs to the field of battery coating technology, and specifically relates to a gasket for a coating die, a coating die, and a coating equipment. Background Technology

[0002] Coating is a crucial process in lithium battery manufacturing, and its quality directly impacts battery performance. The coating die, a core component of the coating machine, is primarily used for coating the positive and negative electrodes of lithium batteries, and it is key to determining cell performance. In current technology, a slot extrusion coating process is typically used to coat the battery substrate during lithium battery manufacturing. During coating, the fluid fed into the extrusion die forms a coating on the substrate. However, in daily coating production and debugging, when a wide die is used to coat a narrow area, material leakage occurs. This causes the main roller to become saturated with slurry, affecting the uniformity of surface density and coating dimensions. Using tape to block slurry overflow at the die lip can lead to the tape being lifted by pressure when the overflow reaches a certain level. The lifted tape rubs against the main coating roller, causing damage. The damaged tape can then tear the foil, resulting in tape breakage and significant waste. Furthermore, the need to periodically replace the tape necessitates die removal, wasting foil and hindering cost reduction.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is that in the process of coating a narrow width with a wide die, the slurry is easy to overflow onto the coating main roller, which is not conducive to reducing costs.

[0005] To solve the above-mentioned technical problems, this utility model provides a gasket for a coating die head. The gasket includes a main gasket disposed between an upper die and a lower die. The main gasket is provided with a coating area and non-coating areas located on both sides of the coating area. The non-coating areas are provided with perforated channels extending along the direction of the coating area towards the non-coating area. The non-coating areas are also provided with a stop portion located between the coating area and the perforated channels, and a first recess portion located on the side of the perforated channels away from the coating area. The stop portion has a gap with the upper die and / or the lower die. The gap is used to allow slurry to penetrate from the coating area into the perforated channels, and the perforated channels guide the slurry to be discharged through the first recess portion.

[0006] Optionally, the gasket may further include one or more second recesses disposed within the hollowed-out flow channel, with the multiple second recesses arranged at intervals.

[0007] Optionally, the length of the second recess along the length of the hollowed-out channel is 10mm to 15mm.

[0008] Optionally, the thickness of the second recess is 40% to 60% of the thickness of the main gasket.

[0009] Optionally, the length of the first recess along the length extension direction of the hollowed-out channel is 40mm to 50mm.

[0010] Optionally, the width of the hollowed-out flow channel ranges from 5 mm to 10 mm.

[0011] Optionally, the length of the blocking portion along the length extension direction of the hollowed-out flow channel is 15mm to 20mm.

[0012] Optionally, the non-coated area is provided with a first side portion and a second side portion, the blocking portion is connected to the first side portion and the second side portion respectively, the first recessed portion is connected to the first side portion and the second side portion respectively, and the first side portion, the second side portion, the blocking portion and the first recessed portion surround the hollowed-out flow channel.

[0013] According to another aspect of the present invention, a coating die head is also provided, comprising an upper die, a lower die, a gasket for coating the die head disposed between the upper die and the lower die, and an extrusion lip disposed between the end of the upper die and the end of the lower die.

[0014] According to another aspect of the present invention, a coating device is also provided, including the aforementioned coating die head.

[0015] Beneficial effects: This invention provides a gasket for a coating die head. A main gasket is positioned between an upper and lower die. A coating area is formed on the main gasket, and non-coating areas are formed on both sides of the coating area. The non-coating areas have perforated channels extending from the coating area towards the non-coating area. Each non-coating area also has a stop portion located between the coating area and the perforated channels, and a first recess located on the side of the perforated channels away from the coating area. Gaps are left between the stop portion and both the upper and lower dies to allow slurry to penetrate from the coating area into the perforated channels and be discharged through the first recess. This design prevents slurry overflow during narrow-width coating with a wide die head, as the width of the coating area is smaller than the width of the die head. The perforated channels, stop portion, and first recess on the non-coating areas of the main gasket create a slurry discharge path. When the slurry overflows from the coating area during the coating process, the baffle initially prevents the slurry from flowing directly into the perforated flow channel. However, due to gaps between the baffle and the upper and lower dies, the overflowing slurry can penetrate through these gaps into the perforated flow channel by its own pressure. The perforated flow channel acts as a guide for the slurry, directing it towards the first recess. From there, the slurry is discharged orderly from both sides of the coating die, preventing accumulation inside the die or overflow onto the main coating roller. Furthermore, in the narrow-width coating process with a wide die, the overflowing slurry from the coating area is discharged through the perforated flow channel from both sides of the coating die, preventing it from sticking to the main roller and reducing coating costs. This achieves the technical effect of preventing slurry overflow onto the main coating roller and reducing costs during the narrow-width coating process with a wide die. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a gasket for a coating die head, provided as an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the main gasket in a gasket for a coating die head, provided as an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of a coating die head provided in an embodiment of the present utility model. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] In the embodiments of this application, "at least one" refers to one or more; "multiple" refers to two or more. In the description of this application, the terms "first," "second," "third," etc., are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0023] In this specification, references such as "one embodiment" or "some embodiments" mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the terms "comprising," "including," "having," and variations thereof in this specification all mean "including but not limited to," unless otherwise specifically emphasized. It should be noted that in the embodiments of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0024] It should be noted that, in the embodiments of this utility model, when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component. Furthermore, in the embodiments of this application, "connection" can also be understood as an electrical connection; the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. The terms "vertical," "horizontal," "left," "right," and similar expressions used in the embodiments of this utility model are for illustrative purposes only and are not intended to limit the utility model.

[0025] This utility model provides a gasket for a coating die head; please refer to [link to relevant documentation]. Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a gasket for a coating die head provided in an embodiment of this utility model. Figure 2 This is a schematic diagram of the structure of the main gasket 1 in a gasket for a coating die head according to an embodiment of the present invention. The gasket for a coating die head provided in this embodiment of the present invention includes a main gasket 1, which is disposed between an upper die 2 and a lower die 3. The main gasket 1 has a coating area 11 and a non-coating area 12, with the non-coating areas 12 located on both sides of the coating area 11. Each non-coating area 12 has a perforated flow channel 13 extending along the direction of the coating area 11 towards the non-coating area 12. A blocking portion 14 and a first recessed portion 15 are also provided on the non-coating area 12, with the blocking portion 14 located in the coating area... Between 11 and the perforated flow channel 13, the first recess 15 is located on the side of the perforated flow channel 13 away from the coating area 11. The blocking part 14 has a gap between it and the upper mold 2 and / or the lower mold 3. For example, the blocking part 14 has a gap between it and the upper mold 2, or the blocking part 14 has a gap between it and the lower mold 3, or the blocking part 14 has a gap between it and both the upper mold 2 and the lower mold 3. The gap is used to allow the slurry to penetrate from the coating area 11 into the perforated flow channel 13, and the perforated flow channel 13 guides the slurry through the first recess 15 and discharges it.

[0026] The coating area 11 on the main gasket 1 is the main area through which the slurry passes. The width of the coating area 11 can be preset according to actual coating requirements. The non-coating area 12 is located on both sides of the coating area 11. The perforated channel 13 can be straight, which helps to improve the smoothness and directionality of the slurry flow. The baffle 14 is located between the coating area 11 and the perforated channel 13. The baffle 14 can effectively prevent a large amount of slurry from flowing directly into the perforated channel 13. That is, the baffle 14 can be used for preliminary filtration and buffering. The baffle 14 can form a small gap with the upper mold 2 and the lower mold 3 respectively. This gap can effectively prevent a large amount of slurry from flowing directly into the perforated channel 13 quickly, preventing the slurry from flowing out too quickly. At the same time, it also avoids being completely sealed. When the slurry in the coating area 11 overflows under pressure, the slurry can slowly penetrate into the perforated channel 13 through the small gap, achieving controlled discharge. At the same time, the first recess 15 is conducive to the collection and discharge of slurry to meet the slurry discharge requirements in the continuous coating process.

[0027] In actual operation, when the coating die is applied in a narrow band, the slurry overflows from the coating area 11 to the non-coating areas 12 on both sides under pressure. The overflowing slurry is initially blocked by the baffle 14. Due to the pressure of the slurry during coating, some of it seeps into the perforated channel 13 through the tiny gap between the baffle 14 and the upper and lower dies 2 and 3. Under its own pressure and gravity, the slurry in the perforated channel 13 flows away from the coating area 11 along the straight perforated channel 13 until it enters the first recess 15. The first recess 15 then collects the slurry and guides it to be discharged orderly from the side of the coating die, preventing the slurry from accumulating inside the die or overflowing onto the coating roller, thus reducing equipment contamination and cleaning / maintenance workload.

[0028] In this embodiment, a main gasket 1 is disposed between the upper mold 2 and the lower mold 3. A coating area 11 is disposed on the main gasket 1, and non-coating areas 12 are disposed on both sides of the coating area 11. The non-coating areas 12 are provided with perforated channels 13 extending along the direction of the coating area 11 towards the non-coating areas 12. The non-coating areas 12 are also provided with a stop portion 14 located between the coating area 11 and the perforated channels 13, and a first recess portion 15 located on the side of the perforated channels 13 away from the coating area 11. Gaps are left between the stop portion 14 and the upper mold 2 and the lower mold 3, respectively. The gaps are used to allow the slurry to penetrate from the coating area 11 into the perforated channels 13 and be discharged through the first recess portion 15. In this way, during the coating process of a narrow width with a wide die head, since the width of the coating area 11 is smaller than the width of the coating die head, the slurry on both sides of the coating area 11 is prone to overflow. A slurry discharge path is formed by setting a perforated flow channel 13, a blocking part 14, and a first recessed part 15 in the non-coating area 12 on the main gasket 1. When the slurry overflows from the coating area 11 during the coating process, the blocking part 14 first blocks the slurry from flowing directly to the perforated flow channel 13. However, since there are gaps between the blocking part 14 and the upper die 2 and the lower die 3, the overflowing slurry can penetrate through the gaps into the perforated flow channel 13 by its own pressure. The perforated flow channel 13 serves as a slurry guide channel to guide the slurry to the first recessed part 15, and then the first recessed part 15 allows the slurry to be discharged orderly from both sides of the coating die head, avoiding the accumulation of slurry inside the die head or overflowing onto the coating main roller. Subsequently, in the process of coating a narrow width with a wide die head, the slurry overflowing from the coating area 11 is discharged from both sides of the coating die head through the perforated flow channel 13, so as to avoid the slurry sticking to the main roller, and at the same time, it helps to reduce coating costs. This achieves the technical effect of preventing slurry from overflowing onto the coating roller during the coating process of a wide die head coating a narrow width, while also helping to reduce costs.

[0029] As one embodiment, the gasket for a coating die head provided in this utility model further includes a second recess 16, which is disposed inside the hollowed-out flow channel 13. The number of second recesses 16 can be one or more, and the multiple second recesses 16 are arranged at intervals. The length direction of the hollowed-out flow channel 13 refers to... Figure 1 In the horizontal direction shown, there can be one second recess 16, located in the middle of the perforated channel 13. Alternatively, there can be multiple second recesses 16, such as two, evenly distributed along the length of the perforated channel 13. The shape of the second recess 16 can be rectangular, circular, or elliptical, preferably rectangular. During the coating process, when the slurry overflows from the coating area 11, it is first blocked by the blocking part 14, and then penetrates into the perforated channel 13 through the gap between the blocking part 14 and the upper mold 2 and / or lower mold 3. As the slurry flows within the perforated channel 13, it passes through the second recesses 16 located within the perforated channel 13. The second recess 16 slows down the flow rate of the slurry within the perforated channel 13, preventing unstable flow caused by excessive speed. Simultaneously, the second recess 16 can temporarily store some slurry; for example, if the slurry volume suddenly increases, the second recess 16 acts as a buffer to prevent excessive slurry accumulation and overflow within the perforated channel 13. Furthermore, when multiple second recesses 16 are provided, the slurry passes through them sequentially, resulting in a smoother and more orderly flow. This facilitates control of the slurry's flow rate and volume, ensuring stable discharge from the first recess 15 and preventing slurry accumulation inside the die head or overflow onto the coating roller, thus improving the stability and controllability of slurry discharge.

[0030] In some embodiments, the length of the second recess 16 extending along the length direction of the perforated channel 13 is 10mm to 15mm. When there are multiple second recesses 16, the interval between two adjacent second recesses 16 is 100mm. For example, two second recesses 16 can be provided, each second recess 16 having a length of 12mm, and the interval between two adjacent second recesses 16 being 100mm. The width of the perforated channel 13 refers to... Figure 1 In the vertical direction shown, the width of the second recess 16 is the same as the width of the perforated channel 13. The thickness of the main gasket 1 refers to the following... Figure 3As shown in the vertical direction, the thickness of the second recess 16 can be half the thickness of the main gasket 1. During the coating process, when the slurry overflows from the coating area 11 and penetrates into the perforated flow channel 13 through the gap between the blocking part 14 and the upper mold 2 and / or the lower mold 3, the slurry will pass through the two second recesses 16 in sequence. The second recesses 16 have sufficient volume to temporarily store and buffer the slurry, and allow the slurry enough distance and time to stabilize its flow state during the flow process. This avoids unstable slurry flow caused by the second recesses 16 being too dense, which is beneficial to improving the uniformity and stability of slurry discharge.

[0031] In some embodiments, the thickness of the second recess 16 is 40% to 60% of the thickness of the main gasket 1. For example, when the thickness of the main gasket 1 is 0.15 mm, the thickness of the second recess 16 is 0.06 mm to 0.09 mm. Preferably, the thickness of the second recess 16 can be 0.075 mm, that is, 50% of the thickness of the main gasket 1. When the thickness of the second recess 16 is less than 40% of the thickness of the main gasket 1, the volume of the second recess 16 is too small and insufficient to effectively buffer and store the overflowing slurry. When the thickness is greater than 60% of the thickness of the main gasket 1, the second recess 16 is too deep, which can easily cause the slurry to stay in the recess for too long, affecting the discharge efficiency and also reducing the structural strength of the main gasket 1 in this area. During the coating process, the second recess 16, with a thickness of 40% to 60% of the main gasket 1, can form a slurry collection area of ​​appropriate depth. When the slurry overflows from the coating area 11 and penetrates into the perforated flow channel 13 through the gap between the blocking part 14 and the upper mold 2 and / or lower mold 3, the slurry will flow into the second recess 16. Due to the moderate thickness of the second recess 16, the slurry can form a stable flow layer in the second recess 16, neither overflowing quickly due to the recess being too shallow nor stagnating due to the recess being too deep. This allows the second recess 16 to maintain sufficient slurry buffer capacity while also allowing the slurry to flow smoothly to the first recess 15 and eventually be discharged.

[0032] In some embodiments, the length of the first recess 15 extending along the length of the perforated channel 13 is 40mm to 50mm, for example, the length of the first recess 15 can be 45mm. The width of the first recess 15 is the same as the width of the perforated channel 13, and the thickness of the first recess 15 can be the same as the thickness of the main gasket 1. The first recess 15 can be rectangular or semi-circular, preferably rectangular, to reduce the accumulation of slurry at the corners. When the length of the first recess 15 is less than 40mm, the volume of the first recess 15 is insufficient to effectively collect and drain a large amount of overflowing slurry, especially in the case of high-speed coating or high slurry viscosity. When the length of the first recess 15 is greater than 50mm, the excessive length of the first recess 15 will weaken the structural strength of the main gasket 1 in this area, and will also increase the material cost of the gasket. During the coating process, the first recess 15 with a length of 40mm to 50mm can provide a sufficiently large slurry collection and drainage area. When the slurry overflows from the coating area 11 into the perforated channel 13 and flows through the perforated channel 13, it will eventually enter the first recess 15. Since the first recess 15 has sufficient length and volume, it can effectively collect the slurry from the perforated channel 13 and guide the slurry to be discharged in an orderly manner from both sides of the coating die head, which is beneficial to improving the efficiency and reliability of slurry discharge.

[0033] In some embodiments, the width of the perforated channel 13 ranges from 5 mm to 10 mm, such as 7 mm. The thickness of the perforated channel 13 is the same as the thickness of the main gasket 1. The perforated channel 13 can be straight or curved, preferably straight, to reduce the resistance of the slurry during flow. When the width of the perforated channel 13 is less than 5 mm, it will be too narrow, causing obstruction of slurry flow, especially when the slurry viscosity is high or contains particulate matter, which can easily cause blockage. When the width of the perforated channel 13 is greater than 10 mm, it will weaken the structural strength of the main gasket 1 in this area, and will also increase the diffusion and unstable flow of the slurry in the channel. That is, during the coating process, a perforated channel 13 with a width of 5 mm to 10 mm can provide a suitable slurry flow channel. When the slurry overflows from the coating area 11 into the hollowed-out channel 13 and penetrates into the hollowed-out channel 13 through the gap between the blocking part 14 and the upper mold 2 and / or the lower mold 3, the slurry will form a stable flow in the hollowed-out channel 13 with a moderate width. At this time, since the width of the hollowed-out channel 13 is sufficient, the slurry will not accumulate or block due to the channel being too narrow. At the same time, the width is not too large, which can maintain the directional flow of the slurry and guide the slurry to flow orderly towards the first recess 15. This is beneficial for the hollowed-out channel 13 to maintain sufficient slurry flow capacity while also improving the stability and directionality of the slurry flow.

[0034] In some embodiments, the length of the blocking portion 14 extending along the length of the perforated channel 13 is 15mm to 20mm. For example, the length of the blocking portion 14 can be 18mm, the width of the blocking portion 14 can be 3mm, and the thickness of the blocking portion 14 can be slightly less than the thickness of the main gasket 1. When the length of the blocking portion 14 is less than 15mm, the blocking portion 14 will be too short to effectively block and control the slurry overflowing over a large area. When the length of the blocking portion 14 is greater than 20mm, the excessive length of the blocking portion 14 will increase the resistance and time of slurry penetration, affecting the discharge efficiency, and also increasing the material cost of the gasket. That is, during the coating process, the blocking portion 14 with a length of 15mm to 20mm can provide a sufficiently long slurry blocking and penetration control area. When the slurry overflows from the coating area 11, it will first encounter the aforementioned blocking portion 14 of appropriate length. The blocking portion 14 will prevent the slurry from flowing directly to the perforated channel 13, so that the slurry forms a certain pressure in front of the blocking portion 14. Because there is a gap between the blocking part 14 and the upper mold 2 and / or the lower mold 3, under pressure, the slurry will slowly penetrate into the hollow flow channel 13 through the gap, so that the blocking part 14 can maintain sufficient slurry blocking ability while also improving the uniformity and controllability of slurry penetration.

[0035] In some embodiments, a first side portion 121 and a second side portion 122 are provided on the non-coating area 12. A blocking portion 14 is connected to the first side portion 121 and the second side portion 122 respectively, and a first recessed portion 15 is connected to the first side portion 121 and the second side portion 122 respectively. The first side portion 121, the second side portion 122, the blocking portion 14, and the first recessed portion 15 surround the hollowed-out flow channel 13. The first side portion 121 is located on one side of the hollowed-out flow channel 13, and the second side portion 122 is located on the other side of the hollowed-out flow channel 13. The thickness of the first side portion 121 and the second side portion 122 can both be the same as the thickness of the main gasket 1. One end of the blocking part 14 is adjacent to the coating area 11, and the other end is connected to the first side part 121 and the second side part 122 respectively. One end of the first recessed part 15 is connected to the hollow flow channel 13, and the other end is connected to the first side part 121 and the second side part 122 respectively, so that the first side part 121, the second side part 122, the blocking part 14 and the first recessed part 15 together enclose and form the hollow flow channel 13 for slurry flow. During the coating process, when the slurry overflows from the coating area 11 and penetrates into the perforated channel 13 through the gap between the blocking part 14 and the upper mold 2 and / or the lower mold 3, the slurry will form a directional flow within the perforated channel 13 surrounded by the first side part 121, the second side part 122, the blocking part 14 and the first recessed part 15, so that the slurry can only flow from the coating area 11 to the first recessed part 15 along the path constrained by the perforated channel 13, thus avoiding the lateral diffusion and uncontrollable flow of the slurry during the flow process.

[0036] In order to provide a detailed description of the coating die head provided by this utility model, the above embodiments have provided a detailed description of a gasket for the coating die head. Based on the same utility model concept, this application also provides a coating die head.

[0037] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a coating die provided in an embodiment of this utility model. Figure 3 The main gasket 1 is located between the upper mold 2 and the lower mold 3. This utility model embodiment provides a coating die head, including an upper mold 2, a lower mold 3, the aforementioned gasket for the coating die head, and an extrusion head lip 4. The main gasket 1 of the aforementioned gasket for the coating die head is disposed between the upper mold 2 and the lower mold 3, and the extrusion head lip 4 is disposed between the end of the upper mold 2 and the end of the lower mold 3. Additionally, it may include a substrate and a coating roller. The substrate is aligned with the extrusion head lip 4, and the coating roller can drive the substrate to rotate, i.e., the coating main roller drives the substrate to rotate. The perforated flow channel 13 is located between the T-block 5 and the extrusion head lip 4, allowing overflowing slurry to be discharged in time near the extrusion head lip 4, preventing slurry from accumulating inside the die or overflowing onto the coating main roller. The T-block 5 can distribute the slurry and guide it to the extrusion head lip 4. The extrusion head lip 4 is located between the end of the upper die 2 and the end of the lower die 3, and can be used to control the exit thickness and uniformity of the slurry. The substrate can be aluminum foil or copper foil of lithium battery electrode sheets. The substrate is aligned with the extrusion head lip 4 to receive the slurry flowing out from the extrusion head lip 4. By rotating the substrate with the coating roller, the substrate can pass through the extrusion head lip 4 at a stable speed, receiving a uniform slurry coating. During the coating process, the slurry can enter from the rear of the coating die, be distributed by the T-block 5, and flow to the extrusion head lip 4. When the slurry overflows from the coating area 11, the blocking part 14 will first block the slurry from flowing directly to the hollow flow channel 13. Since there are gaps between the blocking part 14 and the upper mold 2 and the lower mold 3 respectively, the overflowing slurry can penetrate into the hollow flow channel 13 through the gaps by its own pressure. The hollow flow channel 13 guides the slurry to the first recess 15, and then the slurry can be discharged in an orderly manner from both sides of the coating die head through the first recess 15.

[0038] This invention provides a coating die head. A main gasket 1 is positioned between an upper die 2 and a lower die 3. A coating area 11 is provided on the main gasket 1, and non-coating areas 12 are provided on both sides of the coating area 11. Each non-coating area 12 has a perforated flow channel 13 extending along the direction of the coating area 11 towards the non-coating area 12. The non-coating area 12 also has a stop portion 14 located between the coating area 11 and the perforated flow channel 13, and a first recessed portion 15 located on the side of the perforated flow channel 13 away from the coating area 11. Gaps are left between the stop portion 14 and both the upper die 2 and the lower die 3, allowing the slurry to penetrate from the coating area 11 into the perforated flow channel 13 and be discharged through the first recessed portion 15. Thus, during the coating of a narrow area with a wide die head, because the width of the coating area 11 is smaller than the width of the die head, the slurry on both sides of the coating area 11 easily overflows. A slurry discharge path is formed by setting a perforated flow channel 13, a blocking part 14, and a first recessed part 15 in the non-coating area 12 on the main gasket 1. When the slurry overflows from the coating area 11 during the coating process, the blocking part 14 first blocks the slurry from flowing directly to the perforated flow channel 13. However, since there are gaps between the blocking part 14 and the upper die 2 and the lower die 3, the overflowing slurry can penetrate through the gaps into the perforated flow channel 13 by its own pressure. The perforated flow channel 13 serves as a slurry guide channel to guide the slurry to the first recessed part 15, and then the first recessed part 15 allows the slurry to be discharged orderly from both sides of the coating die head, avoiding the accumulation of slurry inside the die head or overflowing onto the coating main roller. Subsequently, in the process of coating a narrow width with a wide die head, the slurry overflowing from the coating area 11 is discharged from both sides of the coating die head through the perforated flow channel 13, so as to avoid the slurry sticking to the main roller, and at the same time, it helps to reduce coating costs. This achieves the technical effect of preventing slurry from overflowing onto the coating roller during the coating process of a wide die head coating a narrow width, while also helping to reduce costs.

[0039] In order to provide a detailed description of the coating equipment provided by this utility model, the above embodiments have provided a detailed description of a gasket for a coating die head. Based on the same inventive concept, this application also provides a coating equipment.

[0040] This utility model provides a coating device, including the aforementioned coating die, and may further include a slurry supply system. The slurry supply system supplies slurry to the coating die and may include a slurry storage tank, a delivery pump, and a filter. The slurry storage tank stores and agitates the slurry to maintain its uniformity. The delivery pump transports the slurry from the storage tank to the coating die and can control the slurry flow rate and pressure. The filter filters impurities and particles from the slurry to improve its purity. The slurry is delivered from the slurry supply system to the coating die, and after passing through the extrusion head lip 4 of the coating die, it can be uniformly coated onto the substrate.

[0041] This invention provides a coating device. A main gasket 1 is disposed between an upper mold 2 and a lower mold 3. A coating area 11 is disposed on the main gasket 1, and non-coating areas 12 are disposed on both sides of the coating area 11. The non-coating areas 12 are provided with perforated channels 13 extending along the direction of the coating area 11 towards the non-coating area 12. The non-coating areas 12 are also provided with a stop portion 14 located between the coating area 11 and the perforated channels 13, and a first recess portion 15 located on the side of the perforated channels 13 away from the coating area 11. Gaps are left between the stop portion 14 and the upper mold 2 and the lower mold 3, respectively, to allow the slurry to penetrate from the coating area 11 into the perforated channels 13 and be discharged through the first recess portion 15. In this way, during the coating process of a narrow width with a wide die head, because the width of the coating area 11 is smaller than the width of the die head, the slurry on both sides of the coating area 11 is prone to overflow. A slurry discharge path is formed by setting a perforated flow channel 13, a blocking part 14, and a first recessed part 15 in the non-coating area 12 on the main gasket 1. When the slurry overflows from the coating area 11 during the coating process, the blocking part 14 first blocks the slurry from flowing directly to the perforated flow channel 13. However, since there are gaps between the blocking part 14 and the upper die 2 and the lower die 3, the overflowing slurry can penetrate through the gaps into the perforated flow channel 13 by its own pressure. The perforated flow channel 13 serves as a slurry guide channel to guide the slurry to the first recessed part 15, and then the first recessed part 15 allows the slurry to be discharged orderly from both sides of the coating die head, avoiding the accumulation of slurry inside the die head or overflowing onto the coating main roller. Subsequently, in the process of coating a narrow width with a wide die head, the slurry overflowing from the coating area 11 is discharged from both sides of the coating die head through the perforated flow channel 13, so as to avoid the slurry sticking to the main roller, and at the same time, it helps to reduce coating costs. This achieves the technical effect of preventing slurry from overflowing onto the coating roller during the coating process of a wide die head coating a narrow width, while also helping to reduce costs.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A gasket for a coating die head, characterized in that, The gasket includes a main gasket disposed between the upper mold and the lower mold. The main gasket has a coating area and non-coating areas on both sides of the coating area. The non-coating areas have perforated channels extending along the direction of the coating area towards the non-coating area. The non-coating areas also have a stop portion located between the coating area and the perforated channels, and a first recess located on the side of the perforated channels away from the coating area. The stop portion has a gap with the upper mold and / or the lower mold. The gap is used to allow slurry to penetrate from the coating area into the perforated channels, and the perforated channels guide the slurry to be discharged through the first recess.

2. The gasket for a coating die head according to claim 1, characterized in that, The gasket also includes one or more second recesses disposed within the hollowed-out flow channel, with the multiple second recesses arranged at intervals.

3. The gasket for a coating die head according to claim 2, characterized in that, The second recessed portion extends for 10 mm to 15 mm along the length of the hollowed-out channel.

4. The gasket for a coating die head according to claim 2, characterized in that, The thickness of the second recess is 40% to 60% of the thickness of the main gasket.

5. The gasket for a coating die head according to claim 1, characterized in that, The length of the first recess along the length of the hollowed-out channel is 40mm to 50mm.

6. The gasket for a coating die head according to claim 1, characterized in that, The width of the hollowed-out flow channel ranges from 5mm to 10mm.

7. The gasket for a coating die head according to claim 1, characterized in that, The length of the blocking part along the length of the hollowed-out flow channel is 15mm to 20mm.

8. The gasket for a coating die head according to claim 1, characterized in that, The non-coated area is provided with a first side portion and a second side portion. The blocking portion is connected to the first side portion and the second side portion respectively. The first recessed portion is connected to the first side portion and the second side portion respectively. The first side portion, the second side portion, the blocking portion and the first recessed portion surround the hollow flow channel.

9. A coating die head, characterized in that, It includes an upper die, a lower die, a gasket for coating die head as described in any one of claims 1 to 8 disposed between the upper die and the lower die, and an extrusion head lip disposed between the end of the upper die and the end of the lower die.

10. A coating apparatus, characterized in that, Includes the coating die head as described in claim 9.

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