Coating die head structure and coating device

Abstract

The embodiment of the utility model provides a coating die head structure and a coating device, and relates to the field of pole piece coating devices. The utility model aims to solve the problem that the coating effect and the service life of an extrusion coating die head are affected due to large surface density fluctuation in the coating process of the extrusion coating die head. The coating die head structure comprises an upper die head and a lower die head, the lower die head is matched with the upper die head, and a main material cavity, a discharging cavity, a feeding port communicated with the main material cavity and a coating discharging port communicated with the discharging cavity are formed between the lower die head and the lower die head; the main material cavity is provided with two opposite ends, the discharging cavity is provided with two opposite ends, and the two ends of the main material cavity are communicated with the two ends of the discharging cavity respectively. The coating device comprises the coating die head structure. Slurry is input from the feeding port, the two ends of the main material cavity are communicated with the two ends of the discharging cavity, when the slurry conveying amount of the feeding port is not changed, the slurry flows to the two ends of the main material cavity, and the problems that the slurry in the discharging cavity flows to the two ends, and the slurry in the middle is reduced are solved.

Description

Technical Field

[0001] The utility model relates to the field of pole piece coating devices, in particular to a coating die head structure and a coating device. Background Art

[0002] In the production process of lithium batteries, the coating process is indeed a crucial link, which directly affects the performance and quality of the battery. The uniformity of the coating is particularly critical because it determines the distribution of materials inside the battery and the efficiency of the battery. In order to ensure the uniformity of the coating, the high-speed coating process usually adopts the extrusion coating method. The core of the extrusion coating method lies in the extrusion die used. The extrusion die is a key component of the coating equipment, and its design and manufacturing quality directly affect the coating effect and battery quality. The main function of the extrusion die is to make the slurry under uniform pressure inside the die through extrusion, and evenly flow out from the tiny outlet of the die, so as to achieve uniform coating on the substrate.

[0003] However, for wide-width coating (coating width > 800mm), during the production process, due to the processing accuracy error of the die head itself, slurry characteristics, etc., the pressure in the cavity fluctuates greatly, and the coating surface density fluctuates synchronously, resulting in the following problems.

[0004] 1. The slurry enters the main material cavity from the feed port, and flows to the discharge cavity when the liquid level in the main material cavity is full. When the inlet slurry delivery volume remains unchanged, the pressure in the die head is too high or the pressure continues to increase. The slurry in the cavity changes with the pressure change. The slurry in the cavity will continue to flow to both ends, and the slurry in the middle will decrease. The slurry coming out of the die head lip will be inconsistent, resulting in the phenomenon that the surface density of the electrode is high on both sides and low in the middle.

[0005] 2. When the pressure in the die cavity is too high, it cannot be discharged normally. The cavity pressure can be released by increasing the knife distance and moving away from the steel roller, but the pole piece size deviation will occur and the process requirements will not be met.

[0006] 3. The pressure in the die cavity increases for a long time, the gasket will slowly deform, and the upper and lower die surfaces will also wear, which greatly reduces the service life of the die and increases costs. Utility Model Content

[0007] The purpose of the utility model includes, for example, providing a coating die structure, which can improve the problem that the surface density fluctuates greatly during the coating process of the extrusion coating die, affecting the coating effect and the life of the die.

[0008] The utility model also aims to provide a coating device which can improve the problem that the surface density of the extrusion coating die head fluctuates greatly during the coating process, thus affecting the coating effect and the life of the die head.

[0009] The embodiments of the present invention can be implemented as follows:

[0010] An embodiment of the utility model provides a coating die structure, including an upper die and a lower die, wherein the lower die cooperates with the upper die, and a main material cavity, a discharge cavity, a feed port connected to the main material cavity, and a coating discharge port connected to the discharge cavity are formed between the lower die and the lower die; the main material cavity has two opposite ends, and the discharge cavity has two opposite ends, and the two ends of the main material cavity are respectively connected to the two ends of the discharge cavity.

[0011] In addition, the coating die head structure provided in the embodiment of the utility model may also have the following additional technical features:

[0012] Optionally, the upper die head is provided with a sealing surface; the lower die head is provided with a main material trough and a discharge trough, the main material trough has two opposite ends, the discharge trough has two opposite ends, the two ends of the main material trough are respectively connected with the two ends of the discharge trough; the main material trough and the sealing surface cooperate to form the main material cavity, and the discharge trough and the sealing surface cooperate to form the discharge cavity.

[0013] Optionally, the main material trough and the discharge trough both extend along the length direction of the lower die head, and the main material trough and the discharge trough are arranged side by side and spaced apart along the width direction of the lower die head.

[0014] Optionally, a first connecting groove and a second connecting groove are provided at both ends of the lower die head; one end of the main material trough and one end of the discharge trough are connected through the first connecting groove; the other end of the main material trough and the other end of the discharge trough are connected through the second connecting groove.

[0015] Optionally, the feed port is arranged on the lower die head; the coating die head structure also includes a sealing gasket, and the sealing gasket is provided with a discharge notch; the sealing gasket is arranged between the upper die head and the lower die head, and the discharge port connected to the discharge cavity is formed between the upper die head and the lower die head at the discharge notch.

[0016] Optionally, the sealing gasket cooperates with the main material trough to form the main material cavity.

[0017] Optionally, the coating die head structure also includes a slurry throttling plunger; a slurry throttling plunger is respectively provided at the connecting points at both ends of the main material chamber and the two ends of the discharge chamber so as to adjust the slurry flowing from the main material chamber to the discharge chamber.

[0018] Optionally, the coating die head structure also includes a micrometer mounting seat, a micrometer and a throttling rod, the micrometer mounting seat, the micrometer and the throttling rod are fixed in sequence, and the micrometer is threadedly connected to the upper die head; one end of the throttling rod is fixed to the micrometer, and the other end of the throttling rod is rotatably connected to the slurry throttling plunger; the micrometer mounting seat is used to drive the micrometer to rotate, so as to drive the slurry throttling plunger to move up and down.

[0019] Optionally, the slurry throttling plunger is in the shape of an elongated strip, and both ends of the slurry throttling plunger are in a rounded structure.

[0020] The embodiment of the utility model further provides a coating device, which includes a coating die head structure; the coating roller is arranged corresponding to the coating outlet, and the coating roller is used to transport the electrode to be coated.

[0021] The beneficial effects of the coating die head structure and the coating device of the embodiment of the utility model include, for example:

[0022] The coating die structure includes an upper die and a lower die. The lower die cooperates with the upper die to form a main material cavity, a discharge cavity, a feed port connected to the main material cavity, and a coating discharge port connected to the discharge cavity. The main material cavity has two opposite ends, and the discharge cavity has two opposite ends. The two ends of the main material cavity are connected to the two ends of the discharge cavity. When the slurry delivery volume at the feed port remains unchanged, the slurry flows to the two ends of the main material cavity. At that time, the slurry at the two ends of the main material cavity will flow to the two ends of the discharge cavity, and then flow to the middle of the discharge cavity, which solves the problem that the slurry in the discharge cavity flows to the two ends and the slurry in the middle is reduced, ensures the pressure consistency and stability of the cavity main material cavity and the discharge cavity, and improves the problem of large fluctuations in surface density during coating.

[0023] The coating device includes the above-mentioned coating die structure, which improves the problem that the surface density fluctuates greatly during the coating process of the extrusion coating die, affecting the coating effect and the life of the die. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the overall structure of the coating die head structure provided in this embodiment;

[0026] Figure 2A top view of the lower die in the coating die structure provided in this embodiment;

[0027] Figure 3 A top view of a fixed sealing gasket of a lower die head in the coating die head structure provided in this embodiment;

[0028] Figure 4 A front view of the coating die structure provided in this embodiment;

[0029] Figure 5 for Figure 4 Sectional view of AA in the middle;

[0030] Figure 6 A schematic diagram of the structure of the slurry throttling plunger of the coating die structure provided in this embodiment;

[0031] Figure 7 A front view of the slurry throttling plunger of the coating die structure provided in this embodiment.

[0032] Icons: 10-coating die structure; 100-upper die; 110-sealing surface; 200-lower die; 210-main material trough; 220-discharge trough; 230-feed port; 240-first connecting groove; 250-second connecting groove; 300-sealing gasket; 310-discharge notch; 320-first piece; 330-second piece; 340-third piece; 350-fourth piece; 360-fifth piece; 400-micrometer mounting seat; 410-micrometer; 420-throttling rod; 430-coupling; 440-slurry throttling plunger. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0037] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0038] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0039] Combine the following Figures 1 to 7 The coating die head structure 10 provided in this embodiment is described in detail.

[0040] Please refer to Figure 1 and Figure 2 The embodiment of the utility model provides a coating die structure 10, including an upper die 100 and a lower die 200. The lower die 200 cooperates with the upper die 100 to form a main material cavity, a discharge cavity, a feed port 230 connected to the main material cavity, and a coating discharge port connected to the discharge cavity; the main material cavity has two opposite ends, and the discharge cavity has two opposite ends, and the two ends of the main material cavity are respectively connected to the two ends of the discharge cavity.

[0041] When the "lower die head 200 cooperates with the upper die head 100", a main material cavity and a discharge cavity are formed between the lower die head 200 and the upper die head 100. When the lower die head 200 and the upper die head 100 are opened, the interior of the die head can be inspected and repaired.

[0042] The slurry is input from the feed port 230, and the two ends of the main material chamber are connected with the two ends of the discharge chamber. When the slurry delivery volume of the feed port 230 remains unchanged, the slurry flows to the two ends of the main material chamber. At that time, the slurry at the two ends of the main material chamber will flow to the two ends of the discharge chamber, and then flow to the middle of the discharge chamber, which solves the problem that the slurry in the discharge chamber flows to the two ends and the slurry in the middle is reduced, ensures the pressure consistency and stability of the main material chamber and the discharge chamber, improves the problem of large surface density fluctuations during coating, improves the longitudinal consistency of the electrode, and also improves the service life of the die head.

[0043] Reference Figure 1 and Figure 2In this embodiment, the upper die head 100 is provided with a sealing surface 110; the lower die head 200 is provided with a main material trough 210 and a discharge trough 220, the main material trough 210 has two opposite ends, and the discharge trough 220 has two opposite ends, and the two ends of the main material trough 210 are respectively connected with the two ends of the discharge trough 220; the main material trough 210 cooperates with the sealing surface 110 to form a main material cavity, and the discharge trough 220 cooperates with the sealing surface 110 to form a discharge cavity.

[0044] After the upper die head 100 is covered on the lower die head 200, the sealing surface 110 seals the top of the main material trough 210 and the top of the discharge trough 220 to form a main material cavity and a discharge cavity. The slurry can only flow from the two ends of the main material trough 210 to the discharge trough 220 and will not overflow from the top of the main material trough 210.

[0045] Reference Figure 1 and Figure 2 In this embodiment, the main material trough 210 and the discharge trough 220 both extend along the length direction of the lower die head 200 , and the main material trough 210 and the discharge trough 220 are arranged side by side and spaced apart along the width direction of the lower die head 200 .

[0046] After the slurry is input into the main material tank 210 , it flows to both ends of the main material tank 210 , and then flows to the discharge tank 220 , thereby improving the consistency and stability of the pressure in the main material tank 210 and the discharge tank 220 .

[0047] Reference Figure 1 and Figure 2 In this embodiment, a first connecting groove 240 and a second connecting groove 250 are provided at both ends of the lower die head 200; one end of the main material groove 210 and one end of the discharge groove 220 are connected through the first connecting groove 240; the other end of the main material groove 210 and the other end of the discharge groove 220 are connected through the second connecting groove 250.

[0048] The first connection groove 240 and the second connection groove 250 both extend along the width direction of the lower die head 200, and the first connection groove 240 and the second connection groove 250 are arranged at intervals along the length direction of the lower die head 200. The main material groove 210, the discharge groove 220, the first connection groove 240 and the second connection groove 250 form a quadrilateral-like structure.

[0049] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, the feed port 230 is arranged on the lower die head 200; the coating die head structure 10 also includes a sealing gasket 300, and the sealing gasket 300 is provided with a discharge notch 310; the sealing gasket 300 is arranged between the upper die head 100 and the lower die head 200, and a discharge port connected to the discharge cavity is formed between the upper die head 100 and the lower die head 200 at the discharge notch 310.

[0050] The sealing gasket 300 is embedded between the upper die head 100 and the lower die head 200, and the upper die head 100 and the lower die head 200 are sealed by the sealing gasket 300. The discharge notch 310 forms a discharge port between the upper die head 100 and the lower die head 200, and the discharge port is connected to the discharge cavity for coating the slurry onto the substrate.

[0051] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, the sealing gasket 300 cooperates with the main material trough 210 to form a main material cavity. The sealing gasket 300 surrounds the main material trough 210 and the discharge trough 220 and covers the main material trough 210. The slurry in the main material trough 210 can only flow into the discharge trough 220 from both ends.

[0052] Specifically, the sealing gasket 300 is connected to form a "concave"-shaped first piece 320, a second piece 330, a third piece 340, a fourth piece 350 and a fifth piece 360, the third piece 340 covers the main material trough 210, the second piece 330 and the third piece 340 are located at both ends of the discharge trough 220, the first piece 320 and the fifth piece 360 ​​are located on the side of the discharge trough 220 away from the main material trough 210, and a discharge gap 310 is formed between the first piece 320 and the fifth piece 360.

[0053] Reference Figure 4 and Figure 5 In this embodiment, the coating die head structure 10 also includes a slurry throttling plunger 440; a slurry throttling plunger 440 is respectively provided at the connecting points at both ends of the main material chamber and the two ends of the discharge chamber to adjust the slurry flowing from the main material chamber to the discharge chamber.

[0054] The slurry throttling plunger 440 is slidably disposed at the connection point between the main material chamber and the discharge chamber. By adjusting the slurry throttling plunger 440, the size of the gap between the slurry throttling plunger 440 and the bottom of the connection point can be adjusted, thereby achieving control of the flow rate.

[0055] Specifically, a slurry throttling plunger 440 is provided at both the first connecting groove 240 and the second connecting groove 250. Flow regulation is achieved by adjusting the size of the gap between the slurry throttling plunger 440 and the groove wall of the first connecting groove 240. Flow regulation is achieved by adjusting the size of the gap between the slurry throttling plunger 440 and the bottom wall of the second connecting groove 250.

[0056] Reference Figure 4 and Figure 5In this embodiment, the coating die head structure 10 also includes a micrometer mounting seat 400, a micrometer 410 and a throttle rod 420. The micrometer mounting seat 400, the micrometer 410 and the throttle rod 420 are fixed in sequence, and the micrometer 410 is threadedly connected to the upper die head 100; one end of the throttle rod 420 is fixed to the micrometer 410, and the other end of the throttle rod 420 is rotatably connected to the slurry throttling plunger 440; the micrometer mounting seat 400 is used to drive the micrometer 410 to rotate, so as to drive the slurry throttling plunger 440 to move up and down.

[0057] Manually rotating the micrometer mounting seat 400 drives the micrometer 410 to rotate, thereby driving the micrometer mounting seat 400, the micrometer 410 and the throttle rod 420 to move axially, thereby adjusting the gap between the slurry throttle plunger 440 and the tank wall. The micrometer 410 can improve the accuracy of adjustment and control.

[0058] Reference Figure 6 and Figure 7 In this embodiment, the slurry throttling plunger 440 is in the shape of a long strip, and both ends of the slurry throttling plunger 440 are rounded. The two ends of the slurry throttling plunger 440 are embedded in the first connecting groove 240, and the two ends of the slurry throttling plunger 440 extend into the main material groove 210 and the discharge groove 220. The structure and setting method of the slurry throttling plunger 440 in the second connecting groove 250 are the same. The rounded structure can reduce the adhesion of the slurry to the slurry throttling plunger 440.

[0059] According to a coating die head structure 10 provided in this embodiment, the working principle of the coating die head structure 10 is:

[0060] The two ends of the main material chamber are connected with the two ends of the discharge chamber. When the slurry delivery rate of the feed port 230 remains unchanged, the slurry will flow to the two ends, and then the slurry at the two ends will flow to the discharge chamber, solving the problem that the slurry in the discharge chamber flows to the two ends and the slurry in the middle is reduced, ensuring the pressure consistency and stability between the main material chamber and the discharge chamber.

[0061] The slurry first enters the main material cavity from the feed port 230 of the lower die head 200. A "U-shaped groove" is opened at both ends of the main material cavity and the discharge cavity, with a distance of "W", and is evenly coated on the electrode substrate. There are two slurry throttling plungers 440 of the upper die head 100 directly above the U-shaped groove. Each slurry throttling plunger 440 is equipped with a throttling rod 420, a coupling 430, a micrometer mounting seat 400, and a micrometer 410. By adjusting the height of the head of the micrometer 410, the distance H between the adjustment rod and the U-shaped groove is controlled, thereby adjusting the flow and pressure of the main material cavity and the discharge cavity, ensuring the pressure consistency of the main material cavity and the discharge cavity of the cavity, and finally adjusting the surface density consistency after coating.

[0062] The coating die head structure 10 provided in this embodiment has at least the following advantages:

[0063] The slurry enters the main material cavity from the feed port 230, then flows from both ends of the main material cavity to the discharge cavity, and then flows to the middle of the discharge cavity, improving the problem of low pressure in the middle of the discharge cavity and high pressure at both ends, solving the problem of large fluctuations in surface density during coating, improving the longitudinal consistency of the pole piece, and improving the service life of the die. At the same time, it can also improve the service life of the sealing gasket 300 between the upper die head 100 and the small die head.

[0064] The embodiment of the utility model also provides a coating device, which includes a coating die structure 10; a coating roller is arranged corresponding to a coating outlet, and the coating roller is used to convey the electrode to be coated. The electrode substrate is wound on the coating roller for conveyance, and the slurry extruded from the coating outlet of the coating die structure 10 coats the electrode substrate.

[0065] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A coating die head structure, characterized in that: include: Upper die head (100); and a lower die head (200), the lower die head (200) cooperates with the upper die head (100), and a main material cavity, a discharge cavity, a feed port (230) connected to the main material cavity, and a coating discharge port connected to the discharge cavity are formed between the lower die head (200) and the lower die head (200); the main material cavity has two opposite ends, and the discharge cavity has two opposite ends, and the two ends of the main material cavity are respectively connected to the two ends of the discharge cavity.

2. The coating die structure according to claim 1, characterized in that: The upper die head (100) is provided with a sealing surface (110); the lower die head (200) is provided with a main material trough (210) and a discharge trough (220); the main material trough (210) has two opposite ends, and the discharge trough (220) has two opposite ends, and the two ends of the main material trough (210) are respectively connected to the two ends of the discharge trough (220); the main material trough (210) cooperates with the sealing surface (110) to form the main material cavity, and the discharge trough (220) cooperates with the sealing surface (110) to form the discharge cavity.

3. The coating die structure according to claim 2, characterized in that: The main material trough (210) and the discharge trough (220) both extend along the length direction of the lower die head (200), and the main material trough (210) and the discharge trough (220) are arranged side by side and spaced apart along the width direction of the lower die head (200).

4. The coating die structure according to claim 2, characterized in that: A first connecting groove (240) and a second connecting groove (250) are provided at both ends of the lower die head (200); one end of the main material groove (210) and one end of the discharge groove (220) are connected via the first connecting groove (240); and the other end of the main material groove (210) and the other end of the discharge groove (220) are connected via the second connecting groove (250).

5. The coating die structure according to any one of claims 2 to 4, characterized in that: The feed port (230) is arranged on the lower die head (200); the coating die head structure also includes a sealing gasket (300), and the sealing gasket (300) is provided with a discharge notch (310); the sealing gasket (300) is arranged between the upper die head (100) and the lower die head (200), and the discharge port connected to the discharge cavity is formed between the upper die head (100) and the lower die head (200) at the discharge notch (310).

6. The coating die structure according to claim 5, characterized in that: The sealing gasket (300) cooperates with the main material trough (210) to form the main material cavity.

7. The coating die structure according to any one of claims 1 to 4, characterized in that: The coating die head structure also includes a slurry throttling plunger (440); a slurry throttling plunger (440) is respectively provided at the connecting points at both ends of the main material chamber and the two ends of the discharge chamber in a liftable manner to adjust the slurry flowing from the main material chamber to the discharge chamber.

8. The coating die structure according to claim 7, characterized in that: The coating die head structure also includes a micrometer mounting seat (400), a micrometer (410) and a throttle rod (420); the micrometer mounting seat (400), the micrometer (410) and the throttle rod (420) are fixed in sequence; the micrometer (410) is threadedly connected to the upper die head (100); one end of the throttle rod (420) is fixed to the micrometer (410), and the other end of the throttle rod (420) is rotatably connected to the slurry throttling plunger (440); the micrometer mounting seat (400) is used to drive the micrometer (410) to rotate, so as to drive the slurry throttle plunger (440) to move up and down.

9. The coating die structure according to claim 8, characterized in that: The slurry throttling plunger (440) is in the shape of an elongated strip, and both ends of the slurry throttling plunger (440) are in a rounded structure.

10. A coating device, characterized in that: The coating device comprises a coating roller and a coating die structure as described in any one of claims 1 to 9; the coating roller is arranged corresponding to the coating outlet, and the coating roller is used to transport the electrode to be coated.

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