Die head device and coating equipment
By designing a die head device in the coating equipment to adjust the slurry cavity space, the problem of slurry flowability when the coating width changes was solved, achieving stable slurry output and efficient coating, and reducing the incidence of electrode defects.
Patent Information
- Application Number
- CN202520063619.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-10
AI Technical Summary
Existing slot coating equipment suffers from poor slurry flow in the die cavity when the coating width changes, leading to slurry sedimentation and increased particle size. This results in process abnormalities such as scratches on the electrode surface and broken strips, affecting the product qualification rate.
Design a die head device, including a coating die head and an adjustment component. The slurry chamber is adjusted by a sealing piston and a drive component. A return port is set to ensure the fluidity of the slurry and to return it to the storage tank when the pressure is too high, so as to avoid unstable output.
It improves the slurry fluidity of coating equipment, reduces the risk of particle smearing and electrode scratches, and increases the coating pass rate.
Smart Images
Figure CN223761388U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery coating technology, and in particular to a die head device and coating equipment. Background Technology
[0002] Battery electrode coating mainly uses slit coating, which uniformly coats the positive and negative current collectors with slurry of qualified viscosity and solid content. Existing slit coating equipment generally has a single-cavity or double-cavity die head. When the coating width changes, it is necessary to change the coating width by customizing the opening size of the spacer between the upper and lower dies.
[0003] This method has a problem: when the coating width decreases, the corresponding slurry outlet width at the die lip decreases, while the die cavity size remains unchanged. This results in poor slurry flow at both ends of the die cavity, leading to slurry settling at both ends and an increase in particles inside the cavity. Consequently, process abnormalities such as scratches on the electrode surface and broken strips occur, affecting the product qualification rate. Summary of the Invention
[0004] To address the shortcomings or deficiencies mentioned in the background art, this application provides a die head device and coating equipment. When the gasket opening size is adjusted, the cavity size of the die head can be adaptively adjusted to ensure the fluidity of the slurry in the cavity of the die head, reduce the risk of particle scraping and electrode scratches, and improve the coating qualification rate.
[0005] In a first aspect, embodiments of this application provide a mold head device, including:
[0006] A coating die head is provided with a slurry cavity and a die head lip communicating with the slurry cavity. The coating die head is also provided with at least one feed inlet and a return outlet, both of which are communicating with the slurry cavity.
[0007] An adjustment assembly includes a sealing piston slidably connected within the slurry chamber, and a driving member connected to the sealing piston. The driving member is used to drive the sealing piston to move along the length direction of the slurry chamber to adjust the size of the slurry that can be contained within the slurry chamber.
[0008] In some embodiments, the feed inlet is connected to a feed pipe, the return outlet is connected to a return pipe, and a first valve for opening and closing the return outlet is connected to the return pipe.
[0009] In some embodiments, the number of reflux ports is multiple and they are spaced apart along the length of the coating die head. The reflux pipe has multiple branch pipes that are respectively connected to each of the reflux ports. The first valve is provided between the reflux port and the branch pipe.
[0010] In some embodiments, the driving component is an electric push rod, the telescopic rod of the electric push rod is fixedly connected to the sealing piston, the first valve is an electric valve, the mold head device further includes a controller, and both the electric push rod and the electric valve are electrically connected to the controller.
[0011] In some embodiments, the electric push rod is equipped with a sensor for detecting the extension length of the telescopic rod, and the sensor is electrically connected to the controller.
[0012] In some embodiments, the reflux pipe is connected to the feed pipe via a bypass pipe, and a second valve for opening and closing the bypass pipe is connected between the bypass pipe and the feed pipe.
[0013] In some embodiments, the feed inlet is located in the middle of the slurry chamber, the number of sealing pistons is two and they are respectively located on both sides of the feed inlet, and the number of driving components is two and they are respectively disposed at both ends of the coating die head.
[0014] In some embodiments, the sealing piston includes a rigid piston block and a flexible piston ring. The rigid piston block is provided with an annular groove, the inner ring of the flexible piston ring is interference-fitted with the annular groove, and the outer ring of the flexible piston ring is interference-fitted with the slurry cavity.
[0015] In one aspect, in some embodiments, the die head device further includes a die lip plug for inserting into the die head lip to close the die head lip.
[0016] Secondly, embodiments of this application provide a coating apparatus, comprising:
[0017] The die head device described in any of the above items.
[0018] The beneficial effects of the technical solution provided in this application include:
[0019] This application provides a die head device and a coating equipment, including a coating die head and an adjustment assembly. The coating die head is provided with a slurry cavity and a die head lip communicating with the slurry cavity. The coating die head is also provided with at least one inlet and one return outlet, both of which are communicating with the slurry cavity. The adjustment assembly includes a sealing piston slidably connected in the slurry cavity and a driving component connected to the sealing piston. The driving component is used to drive the sealing piston to move along the length direction of the slurry cavity to adjust the size of the slurry that can be accommodated in the slurry cavity.
[0020] Because a sealing piston is installed in the slurry chamber inside the coating die, and this piston is driven by a drive component, it can move and stop along the length of the slurry chamber, thus separating the slurry chamber and changing the slurry-containing space within it. Therefore, when the coating width is adjusted, the size of the slurry-containing space can be adaptively adjusted using the sealing piston.
[0021] Because the sealing piston can adjust the length of the slurry-containing space within the slurry chamber, the length of the slurry-containing space is matched with the slurry outlet width. Therefore, the fluidity of the slurry within the slurry chamber can be guaranteed, preventing slurry settling at both ends of the die cavity. This reduces the risk of particle scraping and electrode scratches, and improves the coating pass rate.
[0022] It is also equipped with a return port, which can return the slurry to the slurry storage tank through the pipeline, so that the slurry can continue to flow when the coating is finished. In addition, the return port can also be selectively opened during the coating process. When the pressure inside the coating die is too high, the slurry can be discharged from the return port, avoiding the instability of slurry output caused by excessive pressure, thereby improving the coating stability. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of the mold head device provided in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram of the structure of the lower die head provided in an embodiment of this application;
[0026] Figure 3 This is a schematic cross-sectional view of the slurry chamber provided in an embodiment of this application;
[0027] Figure 4 This is a schematic diagram of the structure of the sealing piston provided in an embodiment of this application;
[0028] Figure 5 This is a schematic diagram of the structure of the die lip plug provided in an embodiment of this application.
[0029] The attached diagram lists the components represented by each number as follows:
[0030] 1. Coating die head; 110. Upper die head; 120. Lower die head; 2. Slurry chamber; 3. Die head lip; 4. Feed inlet; 5. Return outlet; 6. Sealing piston; 61. Hard piston block; 62. Flexible piston ring; 7. Drive component; 8. Feed pipe; 9. Return pipe; 91. Branch pipe; 10. First valve; 11. Bypass pipe; 12. Second valve; 13. Die lip plug. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] To address the shortcomings or deficiencies mentioned in the background art, this application provides a die head device and coating equipment. When the gasket opening size is adjusted, the cavity size of the die head can be adaptively adjusted to ensure the fluidity of the slurry in the cavity of the die head, reduce the risk of particle scraping and electrode scratches, and improve the coating qualification rate.
[0033] See Figures 1 to 5 As shown, a first aspect of this application provides a mold head device, including:
[0034] The coating die head 1 is provided with a slurry cavity 2 and a die head lip 3 communicating with the slurry cavity 2. The coating die head 1 is also provided with at least one feed inlet 4 and a return outlet 5, both of which are communicating with the slurry cavity 2.
[0035] The adjustment assembly includes a sealing piston 6 slidably connected to the slurry chamber 2, and a driving member 7 connected to the sealing piston 6. The driving member 7 is used to drive the sealing piston 6 to move along the length direction of the slurry chamber 2 to adjust the size of the slurry that can be contained in the slurry chamber 2.
[0036] In this embodiment, a sealing piston 6 is provided in the slurry cavity 2 within the coating die 1. The sealing piston 6 is driven by a driving component 7 and can move and stop along the length direction of the slurry cavity 2, thereby separating the slurry cavity 2 and changing the slurry holding space within the slurry cavity 2. For example, when the coating width is adjusted, the length of the slurry holding space can be adaptively adjusted.
[0037] Because the sealing piston 6 can adjust the length of the slurry-containing space within the slurry chamber 2, the length of the slurry-containing space is matched with the slurry outlet width. Therefore, the fluidity of the slurry within the slurry chamber 2 can be guaranteed, preventing slurry settling at both ends. This reduces the risk of particle scraping and electrode scratches, and improves the coating qualification rate.
[0038] For example, in this embodiment, the coating die head 1 includes an upper die head 110 and a lower die head 120 arranged opposite to each other. The grooves corresponding to the slurry cavity 2 and the die head lip 3 are formed on the lower die head 120. The driving component 7 adopts a pneumatic push rod, a hydraulic push rod or an electric push rod. The telescopic rod of the driving component 7 passes through the lower die head 120 and is fixedly connected to the sealing piston 6 in the slurry cavity 2. When the coating width needs to be reduced, the driving component 7 drives the sealing piston 6 to move towards the feed port 4, so that the length of the slurry containing space is shortened, thereby reducing the slurry discharge width of the die head lip 3.
[0039] When coating is finished, in order to keep the slurry flowing in the coating die 1, the slurry can be returned to the slurry storage tank through the return port 5 via a pipeline. At the same time, the return port 5 is selectively opened during the coating process. When the pressure in the coating die 1 is too high, the slurry can be discharged from the return port 5 to avoid the slurry output being unstable due to excessive pressure.
[0040] For example, if the coating gasket is replaced in the coating die head 1 to change the slurry width, the position of the sealing piston 6 is adjusted by the drive component 7 so that the length of the slurry containing space in the slurry chamber 2 matches the slurry width. This can prevent the slurry contained in the slurry chamber 2 from exceeding the slurry width, which would cause the slurry at both ends to become less fluid.
[0041] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown in the figure, this application embodiment provides a die head device. The inlet 4 of the die head device is connected to an inlet pipe 8, and the return port 5 is connected to a return pipe 9. A first valve 10 for opening and closing the return port 5 is connected to the return pipe 9.
[0042] In this embodiment of the application, the feed inlet 4 is connected to the feed pipe 8, which is used to guide the slurry to the feed inlet 4; the return port 5 is connected to the return pipe 9, which is used to guide the slurry away from the return port 5; in order to facilitate the control of the opening and closing of the return port 5, a first valve 10 is installed between the return port 5 and the return pipe 9. By opening the first valve 10, the slurry can be discharged from the return port 5 to the return pipe 9, and by closing the first valve 10, the return port 5 can be closed.
[0043] Firstly, in some alternative embodiments: see Figures 1 to 5As shown, this application embodiment provides a die head device, which has multiple return ports 5 and is spaced apart along the length direction of the coating die head 1. The return pipe 9 has multiple branch pipes 91 that are respectively connected to each return port 5. A first valve 10 is provided between the return port 5 and the branch pipe 91.
[0044] In this embodiment, the number of return ports 5 is multiple and they are spaced apart along the length of the coating die 1. This ensures the fluidity of the slurry at both ends of the slurry chamber 2 during slurry return. To facilitate return to the slurry storage tank, the return pipe 9 is connected to each return port 5 via branch pipes 91, and a first valve 10 is installed between each return port 5 and the branch pipe 91. During slurry return, the first valve 10 at each position can be selectively opened or closed according to the position of the sealing piston 6, ensuring smooth slurry return.
[0045] For example, in this embodiment, there are three return ports 5 located at the top of the upper die head 110. The three return ports 5 are evenly distributed along the length of the coating die head 1. There is one feed port 4 located in the middle of the lower die head 120. There are two sealing pistons 6. When the two sealing pistons 6 are close to the feed port 4, the first valves 10 at the return ports 5 on both sides need to be closed to prevent the slurry from flowing back to the back of the sealing piston 6 due to pressure when the middle return port 5 flows back.
[0046] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown in the figure, this application embodiment provides a mold head device. The driving component 7 of the mold head device is an electric push rod. The telescopic rod of the electric push rod is fixedly connected to the sealing piston 6. The first valve 10 is an electric valve. The mold head device also includes a controller. The electric push rod and the electric valve are both electrically connected to the controller.
[0047] In this embodiment, the driving component 7 is an electric push rod, and the first valve 10 is an electric valve. Both the electric push rod and the electric valve are controlled by a controller. When the coating width needs to be changed, the controller can drive the electric push rod to change the position of the sealing piston 6. When the position of the sealing piston 6 changes, the opening and closing state of the first valve 10 at each location is controlled accordingly, thereby ensuring that the slurry flow in the slurry chamber 2 is more efficient.
[0048] For example, the controller is not shown in the figure in this embodiment. The controller can control the extension length of the telescopic rod through a preset program. The telescopic rod can be set to different extension lengths, corresponding to different coating widths, and corresponding to the opening and closing states of the first valves 10 at various locations. This enables the controller to automatically judge and adjust the position of the sealing piston 6, and correspondingly control the opening and closing states of the first valves 10 at various locations.
[0049] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown in the figure, this application embodiment provides a mold head device, on which an electric push rod is provided with a sensor for detecting the extension length of the telescopic rod, and the sensor is electrically connected to the controller.
[0050] The electric push rod of this application embodiment is equipped with a sensor for detecting the extension length of the telescopic rod. The controller can monitor the position or extension length of the telescopic rod in real time based on the information fed back by the sensor, thereby determining the position of the sealing piston 6. This allows for the adjustment of the opening and closing state of the first valves 10 at various locations based on the positional change of the sealing piston 6, so as to make the slurry flow in the slurry chamber 2 more efficient.
[0051] For example, the sensor is not shown in the figure in this embodiment. The sensor can be a displacement sensor or an encoder. The displacement sensor can measure the moving distance of the telescopic rod to determine the extension length, and the encoder can measure the angular displacement of the motor rotation shaft on the electric push rod to determine the extension length of the telescopic rod.
[0052] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown in the embodiment of this application, a die head device is provided. A bypass pipe 11 is connected between the return pipe 9 and the feed pipe 8 of the die head device. A second valve 12 for opening and closing the bypass pipe 11 is connected between the bypass pipe 11 and the feed pipe 8.
[0053] In this embodiment, a bypass pipe 11 connects the return pipe 9 and the feed pipe 8. When the pressure inside the coating die 1 is too high, the second valve 12 is opened, allowing the slurry to be discharged from the return port 5 and flow back to the feed pipe 8 through the return pipe 9 and the bypass pipe 11. This avoids unstable slurry output due to excessive pressure and ensures efficient utilization of the slurry. For example, the second valve 12 can be a safety valve or an overflow valve that automatically opens when the pressure exceeds the limit.
[0054] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown, this application embodiment provides a die head device. The feed inlet 4 of the die head device is located in the middle of the slurry chamber 2. There are two sealing pistons 6, which are located on both sides of the feed inlet 4 respectively. There are two driving components 7, which are respectively disposed at both ends of the coating die head 1.
[0055] In this embodiment, the feed inlet 4 is located in the middle of the slurry chamber 2. There are two sealing pistons 6 located on both sides of the feed inlet 4. There are two driving components 7 installed at both ends of the coating die head 1. The driving components 7 on both sides can drive the sealing pistons 6 on both sides to move closer or further away from each other, so as to facilitate the adjustment of the length of the slurry containing space in the center.
[0056] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown, this application embodiment provides a die head device. The sealing piston 6 of the die head device includes a hard piston block 61 and a flexible piston ring 62. The hard piston block 61 is provided with an annular groove. The inner ring of the flexible piston ring 62 is interference-fitted with the annular groove, and the outer ring of the flexible piston ring 62 is interference-fitted with the slurry cavity 2.
[0057] The sealing piston 6 in this embodiment includes a rigid piston block 61 and a flexible piston ring 62. The rigid piston block 61 is fixedly connected to the telescopic rod of the drive component 7, which can effectively block the slurry and change the actual volume of slurry contained in the slurry chamber 2. The flexible piston ring 62 is interference-fitted with the annular groove on the rigid piston block 61 and also interference-fitted with the wall of the slurry chamber 2, which can prevent the slurry from leaking to the back of the rigid piston block 61. The rigid piston block 61 can be made of metal, and the flexible piston ring 62 can be an elastic sealing ring. The materials of both are not specifically limited here.
[0058] Firstly, in some alternative embodiments: see Figures 1 to 5 As shown, this application embodiment provides a mold head device, which further includes a mold lip plug 13 for inserting into the mold head lip 3 to close the mold head lip 3.
[0059] The die lip plug 13 of this application embodiment has a T-shaped cross-section. At the end of coating, the die lip plug 13 can be inserted into the die lip 3 to seal the die lip 3, ensuring that the slurry will not overflow from the die lip 3 in large quantities when the slurry flows back from the return pipe 9.
[0060] See Figures 1 to 5 As shown, a second aspect of this application provides a coating apparatus, comprising:
[0061] The mold head device of any of the above embodiments.
[0062] The coating equipment in this application adopts the die head device of any of the above embodiments, which can adaptively adjust the length of the slurry containing space, ensure slurry fluidity, reduce the risk of particle scraping and electrode scratches, and improve the coating qualification rate.
[0063] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are 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. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0064] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0065] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A die apparatus, characterized by, The application relates to a coating die device. The coating die device comprises a coating die (1) provided with a slurry cavity (2) and a die lip (3) communicating with the slurry cavity (2), at least one feeding port (4) and a backflow port (5) communicating with the slurry cavity (2); an adjusting assembly comprising a sealing piston (6) slidingly connected in the slurry cavity (2) and a driving member (7) connected with the sealing piston (6) and used for driving the sealing piston (6) to move along the length direction of the slurry cavity (2) to adjust the size of the slurry cavity (2).
2. The die device of claim 1, wherein: The feeding port (4) is communicated with a feeding pipeline (8), the backflow port (5) is communicated with a backflow pipeline (9), and the backflow port (5) is connected with the backflow pipeline (9) and provided with a first valve (10) used for opening and closing the backflow port (5).
3. The die device of claim 2, wherein: The backflow port (5) is provided in plurality and is distributed along the length direction of the coating die (1), the backflow pipeline (9) is provided with a plurality of branch pipelines (91) respectively communicating with the backflow ports (5), and the backflow port (5) is provided with the first valve (10) between the backflow port (5) and the branch pipeline (91).
4. The die device of claim 2 or 3, wherein: The driving member (7) is an electric push rod, the telescopic rod of the electric push rod is fixedly connected with the sealing piston (6), the first valve (10) is an electric valve, and the die device further comprises a controller, and the electric push rod and the electric valve are electrically connected with the controller.
5. The die device of claim 4, wherein: The electric push rod is provided with a sensor used for detecting the extension length of the telescopic rod, and the sensor is electrically connected with the controller.
6. The die device of claim 2, wherein: The backflow pipeline (9) is communicated with the feeding pipeline (8) and provided with a bypass pipeline (11), and the bypass pipeline (11) is connected with the feeding pipeline (8) and provided with a second valve (12) used for opening and closing the bypass pipeline (11).
7. The die device of claim 1, wherein: The feeding port (4) is located in the middle part of the slurry cavity (2), the sealing piston (6) is provided in plurality and located on the two sides of the feeding port (4), and the driving member (7) is provided in plurality and located at the two ends of the coating die (1).
8. The die device of claim 1, wherein: The sealing piston (6) comprises a hard piston block (61) and a flexible piston ring (62), the hard piston block (61) is provided with a ring groove, the inner ring of the flexible piston ring (62) is in interference fit with the ring groove, and the outer ring of the flexible piston ring (62) is in interference fit with the slurry cavity (2).
9. The die device of claim 1, wherein: The die head device further comprises a die lip plug (13) for insertion into the die lip (3) to close the die lip (3).
10. A coating apparatus characterized by comprising: Comprising: The die head device of any one of claims 1 to 9.