Coating die head and coating device

Abstract

The utility model discloses a coating die head and a coating device. The coating die head comprises an upper die head, a lower die head, a turbulent flow mechanism and a buffer mechanism, the upper die head is connected with the lower die head; the lower die head is provided with a cavity, one side face of the lower die head is provided with a feeding port communicated with the cavity, and the opposite side face of the lower die head is provided with a discharging port with an upward opening; a turbulent flow mechanism close to the feeding port and a detachable buffering mechanism close to the discharging port are arranged in the cavity. According to the coating die head and the coating device provided by the utility model, the stability and the consistency of slurry can be improved, so that the coating uniformity, the coating stability and the coating efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of coating, and in particular relates to a coating die head and a coating device. Background Art

[0002] Coating is an essential process in the production of lithium-ion batteries and a key process that directly affects battery safety, capacity, life and other performance. Coating is to evenly, continuously or intermittently coat the prepared paste-like viscous slurry on the pole piece. During the coating process, the thickness consistency of each coating position must be ensured and the coating thickness must be controlled within the tolerance range required by the process.

[0003] However, when using a coating die to coat the electrode, since the slurry has a large kinetic energy when it is input from the feed pipe, it will continuously impact the cavity, making the slurry pressure inside the cavity unstable, and then causing large differences in surface density at different positions of the discharge port, resulting in uneven coating. Therefore, it is urgent to design a coating die with uniform discharge to improve the above problems. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a coating die head and a coating device, which can improve the stability and consistency of the slurry, thereby improving the coating uniformity, stability and coating efficiency.

[0005] The utility model provides the following technical solutions:

[0006] In a first aspect, a coating die is provided, comprising an upper die, a lower die, a spoiler mechanism and a buffer mechanism;

[0007] The upper die head is connected to the lower die head;

[0008] The lower die head is provided with a cavity, one side of the lower die head is provided with a feed port connected to the cavity, and the opposite side is provided with a discharge port opening upward;

[0009] The cavity is provided with a flow disturbance mechanism close to the feed port and a detachable buffer mechanism close to the discharge port.

[0010] Furthermore, the lower die head is connected with a feed pipe, and the feed pipe is communicated with the feed port.

[0011] Furthermore, the spoiler mechanism includes a spoiler rod and a lifting assembly connected to both ends of the spoiler rod, and the lifting assembly is used to drive the spoiler rod to rise and fall to adjust the distance between the spoiler rod and the discharge port.

[0012] Furthermore, the lifting assembly includes a motor, a lead screw and a guide block;

[0013] The inner side walls at both ends of the lower die head are provided with guide grooves, the motor is installed in the guide grooves, and a sealing plate for isolating the motor from the cavity is also provided in the guide grooves;

[0014] The output shaft of the motor is connected to one end of the lead screw, the other end of the lead screw is rotatably connected to the top surface of the guide groove, and the guide block is threadedly connected to the lead screw through a lead screw nut.

[0015] Furthermore, the cross-sectional diameter of the spoiler rod gradually increases from both ends to the middle, and the part with the largest cross-sectional diameter faces the feed inlet.

[0016] Furthermore, the buffer mechanism includes a plurality of baffles arranged in parallel, and the inner walls at both ends of the lower die head are provided with slots matching the baffles; the top end of the baffle is flush with the upper surface of the lower die head, and the bottom end of the baffle is spaced apart from the bottom surface of the cavity.

[0017] Furthermore, the discharge port is formed between a baffle plate close to the side wall of the lower die head and the side wall of the lower die head;

[0018] The buffer mechanism further comprises a partition block, one side of which is connected to a baffle plate close to the side wall of the lower die head, and the other side of which is in contact with the side wall of the lower die head.

[0019] Furthermore, it also includes a gasket arranged between the upper die head and the lower die head, the gasket covers the cavity, and a discharge notch is opened at a position corresponding to the discharge port, and a horizontal plate matching the partition block is arranged at the discharge notch of the gasket.

[0020] Furthermore, the upper die head is provided with a first bolt hole, the gasket is provided with a second bolt hole, and the lower die head is provided with a third bolt hole. The first bolt hole, the second bolt hole and the third bolt hole are located correspondingly and are equipped with connecting bolts therein.

[0021] In a second aspect, a coating device is provided, comprising the coating die head described in the first aspect.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] (1) The coating die head provided by the utility model has a flow disturbance mechanism near the feed port in the lower die head cavity. When the slurry used for the coating operation flows in from the feed port, the flow disturbance mechanism disturbs the slurry, so that the surface density difference of the slurry becomes smaller and the consistency becomes better, and the slurry can be smoothed, thereby improving the stability of the material discharge from the discharge port, and improving the coating uniformity and coating efficiency;

[0024] (2) The coating die head provided by the utility model has a detachable buffer mechanism near the discharge port in the lower die head cavity, which can buffer the slurry before it is discharged from the discharge port, reduce the kinetic energy of the slurry, make the slurry have higher stability when discharging, improve the coating uniformity and stability, and can be directly disassembled and removed when cleaning the cavity without affecting the cleaning of the cavity;

[0025] (3) The coating die head provided by the utility model has a feed port connected to the cavity on one side of the lower die head, and a discharge port opening upward on the opposite side. When discharging the slurry, the slurry can only overflow from the bottom to the top, so that the stability of the slurry is greatly improved, and the coating uniformity and stability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a coating die head in an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of the lower die head in the embodiment of the utility model;

[0028] Figure 3 yes Figure 2 A magnified view of the structure at center A;

[0029] Figure 4 It is a cross-sectional structural schematic diagram of the lifting assembly in the embodiment of the utility model;

[0030] The markings in the figure are: 1. lower die head; 2. discharge port; 3. baffle; 4. gasket; 5. upper die head; 6. feed pipe; 7. partition block; 8. feed port; 9. spoiler rod; 10. screw; 11. slot; 12. guide slot; 13. guide block; 14. sealing plate; 15. motor; 16. cavity; 17. cross plate; 18. discharge notch; 19. first bolt hole; 20. second bolt hole; 21. third bolt hole. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0032] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment provides a coating die head, including an upper die head 5, a gasket 4, a lower die head 1, a spoiler mechanism and a buffer mechanism.

[0035] like Figure 1 As shown, the upper die head 5 is provided with a first bolt hole 19, the gasket 4 is provided with a second bolt hole 20, and the lower die head 1 is provided with a third bolt hole 21. The first bolt hole 19, the second bolt hole 20 and the third bolt hole 21 are positioned correspondingly and are equipped with connecting bolts therein, so as to connect and install the upper die head 5, the gasket 4 and the lower die head 1.

[0036] like Figure 1 and Figure 2 As shown, the lower die head 1 is provided with a cavity 16, a side surface of the lower die head 1 is provided with a feed port 8 communicating with the cavity 16, and the opposite side surface is provided with a discharge port 2 opening upward. The lower die head 1 is connected with a feed pipe 6, and the feed pipe 6 is connected with the feed port 8. A flow disturbance mechanism near the feed port 8 and a detachable buffer mechanism near the discharge port 2 are provided in the cavity 16.

[0037] like Figure 2-Figure 4 As shown, the spoiler mechanism includes a spoiler rod 9 and a lifting assembly connected to both ends of the spoiler rod 9 , and the lifting assembly is used to drive the spoiler rod 9 to move up and down to adjust the distance between the spoiler rod 9 and the discharge port 2 .

[0038] Specifically, Figure 3 and Figure 4 As shown, the lifting assembly includes a motor 15, a lead screw 10 and a guide block 13; the inner side walls at both ends of the lower die head 1 are provided with guide grooves 12, the motor 15 is installed in the guide grooves 12, and a sealing plate 14 for isolating the motor 15 from the cavity 16 is also provided in the guide grooves 12; the output shaft of the motor 15 is connected to one end of the lead screw 10, and the other end of the lead screw 10 is rotatably connected to the top surface of the guide groove 12 after passing through the sealing plate 14, and the guide block 13 is adapted to the guide groove 12 and is threadedly connected to the lead screw 10 through the lead screw nut. When the motor 15 rotates forward or reversely, it drives the lead screw 10 to rotate forward or reversely, so that the guide block 13 is fine-tuned up or down in the guide groove 12, so that the height of the spoiler bar 9 is adjusted. The closer the spoiler bar 9 is to the feed inlet 8, the greater the interference force on the slurry, and vice versa.

[0039] Specifically, Figure 2 As shown, the cross-sectional diameter of the spoiler rod 9 gradually increases from both ends to the middle, and the largest cross-sectional diameter is opposite to the feed port 8. The spoiler rod 9 can be in an ellipsoidal, spindle-shaped or shuttle-shaped shape that meets the above conditions. This feature can reduce the extreme difference in the surface density of the slurry and improve the consistency.

[0040] like Figure 2As shown, the buffer mechanism includes a plurality of baffles 3 arranged in parallel, and the inner walls at both ends of the lower die head 1 are provided with slots 11 matching the baffles 3, and the baffles 3 can be inserted or removed through the slots 11, so as to facilitate the cleaning of the cavity 16; the top end of the baffle 3 is flush with the upper surface of the lower die head 1, and the bottom end of the baffle 3 is spaced apart from the bottom surface of the cavity 16, so that the slurry flows at the bottom of the baffle 3, reducing the kinetic energy of the slurry, buffering the slurry, and making the slurry have higher stability when discharging.

[0041] Further, such as Figure 2 As shown, the discharge port 2 is formed between the baffle plate near the side wall of the lower die head 1 and the side wall of the lower die head 1, and the discharge port 2 is narrow at the bottom and wide at the top; the buffer mechanism also includes a partition block 7, one side of the partition block 7 is connected to the baffle plate 3 near the side wall of the lower die head 1, and the other side is in contact with the side wall of the lower die head 1. The partition block 7 can buffer the slurry before it is discharged from the discharge port 2, reduce the kinetic energy of the slurry, and make the slurry have higher stability when discharging. The opening of the discharge port 2 is upward, and the slurry can only overflow from the bottom to the top when discharging. Combined with its narrow bottom and wide top design, the stability of the slurry is greatly improved, which can improve the coating uniformity and stability.

[0042] like Figure 1 As shown, the gasket 4 is arranged between the upper die head 5 and the lower die head 1, the gasket 4 covers the cavity 16, and a discharge notch 18 is provided at the position corresponding to the discharge port 2, and a transverse plate 17 matching the partition block 7 is provided at the discharge notch 18 of the gasket 4. The gasket 4 can block the baffle 3 part of the spoiler mechanism and the buffer mechanism, so that the slurry can only flow from the bottom of the baffle 3. Therefore, when discharging, the slurry can only overflow from the bottom to the top, so that the stability of the slurry is greatly improved, which is conducive to improving the coating uniformity.

[0043] The working principle of the coating die head in this embodiment is:

[0044] During the coating operation, the slurry is introduced from the feed pipe 6, and the spoiler rod 9 of the spoiler mechanism interferes with the slurry flowing into the feed port 8. The spoiler rod 9 is used to reduce the surface density range and improve the consistency. In the existing coating process, a surface density meter is usually used to detect the electrode. When it is found that the electrode is unevenly coated, the motor 15 is controlled to rotate forward or reverse, driving the lead screw 10 to rotate forward or reverse, so that the guide block 13 is fine-tuned up or down in the guide groove 12, thereby adjusting the height of the spoiler rod 9. The closer the spoiler rod 9 is to the feed port 8, the greater the interference with the slurry, and vice versa. In summary, the spoiler mechanism can smooth the slurry when it enters the cavity 16, thereby improving the stability of the discharge port 2 when discharging the material, and improving the coating efficiency. Subsequently, the slurry flows through the buffer mechanism, and the baffle 3 and the partition block 7 buffer the slurry, reducing the kinetic energy of the slurry, so that the slurry has higher stability when discharging, improving the coating uniformity and stability, and finally the slurry is discharged from the discharge port 2 from bottom to top, with high coating uniformity and good stability.

[0045] Example 2

[0046] This embodiment provides a coating device equipped with the coating die head described in Embodiment 1.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A coating die head, characterized in that: It includes an upper die head, a lower die head, a spoiler mechanism and a buffer mechanism; The upper die head is connected to the lower die head; The lower die head is provided with a cavity, one side of the lower die head is provided with a feed port connected to the cavity, and the opposite side is provided with a discharge port opening upward; The cavity is provided with a flow disturbance mechanism close to the feed port and a detachable buffer mechanism close to the discharge port.

2. The coating die head according to claim 1, characterized in that: The lower die head is connected with a feed pipe, and the feed pipe is communicated with the feed port.

3. The coating die head according to claim 1, characterized in that: The spoiler mechanism comprises a spoiler rod and a lifting assembly connected to both ends of the spoiler rod, and the lifting assembly is used to drive the spoiler rod to move up and down to adjust the distance between the spoiler rod and the discharge port.

4. The coating die head according to claim 3, characterized in that: The lifting assembly includes a motor, a lead screw and a guide block; The inner side walls at both ends of the lower die head are provided with guide grooves, the motor is installed in the guide grooves, and a sealing plate for isolating the motor from the cavity is also provided in the guide grooves; The output shaft of the motor is connected to one end of the lead screw, the other end of the lead screw is rotatably connected to the top surface of the guide groove, and the guide block is threadedly connected to the lead screw through a lead screw nut.

5. The coating die head according to claim 3, characterized in that: The cross-sectional diameter of the spoiler rod gradually increases from both ends to the middle, and the part with the largest cross-sectional diameter faces the feed port.

6. The coating die head according to claim 1, characterized in that: The buffer mechanism comprises a plurality of baffles arranged in parallel, and the inner walls at both ends of the lower die head are provided with slots matching the baffles; the top end of the baffle is flush with the upper surface of the lower die head, and the bottom end of the baffle is spaced apart from the bottom surface of the cavity.

7. The coating die head according to claim 6, characterized in that: The discharge port is formed between a baffle plate close to the side wall of the lower die head and the side wall of the lower die head; The buffer mechanism further comprises a partition block, one side of which is connected to a baffle plate close to the side wall of the lower die head, and the other side of which is in contact with the side wall of the lower die head.

8. The coating die head according to claim 7, characterized in that: It also includes a gasket arranged between the upper die head and the lower die head, the gasket covers the cavity, and a discharge notch is opened at a position corresponding to the discharge port, and a transverse plate matching the partition block is arranged at the discharge notch of the gasket.

9. The coating die head according to claim 8, characterized in that: The upper die head is provided with a first bolt hole, the gasket is provided with a second bolt hole, and the lower die head is provided with a third bolt hole. The first bolt hole, the second bolt hole and the third bolt hole are located in corresponding positions and are equipped with connecting bolts.

10. A coating device, characterized in that: The coating die head comprises the coating die head according to any one of claims 1 to 9.

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