Coating die head capable of detecting and adjusting pressure of coating cavity in partitioned manner

Abstract

The utility model discloses a coating die head capable of detecting and adjusting the pressure of a coating cavity in a partitioned manner. The coating die head comprises an upper die head and a lower die head, the lower die head is arranged below the upper die head, and a coating cavity and a slurry supply pipe communicated with the coating cavity are arranged in the lower die head; a plurality of slurry discharging ports are formed in the coating gasket, the coating gasket is arranged between the upper die head and the lower die head, the upper die head, the coating gasket and the lower die head define a slurry coating runner, the coating cavity is communicated with the discharging ports, the discharging ports are communicated with the coating runner, and a coating port is formed in the end of the coating runner; the pressure adjusting block is formed by splicing a plurality of sub pressure adjusting blocks with the same or different sizes, the pressure adjusting block is arranged below the coating gasket and corresponds to the position of the discharge port in the coating gasket, and the pressure adjusting block is located in the coating cavity; and the plurality of cavity pressure sensors are arranged on the upper die head and / or the lower die head and are used for respectively detecting the pressure corresponding to each discharge hole in the coating cavity.

Description

Technical Field

[0001] This utility model relates to the technical field of slurry coating equipment, specifically to a coating die head that can detect and adjust the pressure of the coating cavity in sections. Background Technology

[0002] With increasingly stringent performance requirements for lithium batteries, the current extrusion continuous coating dies used in the lithium battery industry suffer from uneven slurry flow rates in different parts of the coating cavity due to the influence of the main slurry supply position. This results in uneven coating pressure within the die cavity, with the pressure distribution being higher in the middle and lower on both sides. This uneven coating pressure leads to unstable surface density trends in the lithium battery electrode coating. During the coating process, the transverse surface density of the electrode gradually shows a trend of lower in the middle and higher on both sides, or vice versa, and this trend gradually worsens.

[0003] As the areal density trend deteriorates, the current coating die cannot effectively monitor the pressure changes in different areas of the die cavity, and cannot take corresponding measures to ensure the lateral consistency of pressure in the coating cavity based on the pressure changes. This problem of uneven coating pressure will seriously affect the areal density consistency of the coated electrode, and thus affect the cell capacity and performance consistency. Utility Model Content

[0004] The purpose of this invention is to address the problem that uneven coating pressure (i.e., inconsistent lateral pressure in the coating cavity) in current coating dies leads to inconsistent coating density of lithium battery electrodes, which in turn affects the cell capacity and performance consistency. This invention designs a coating die with zone detection and adjustment of coating cavity pressure, which can ensure lateral pressure consistency in the coating cavity, thereby solving the above-mentioned problem.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] This utility model designs a coating die head that can detect and adjust the pressure of the coating chamber in sections. The coating die head includes:

[0007] Upper mold head;

[0008] The lower die head is located below the upper die head. The lower die head is provided with a coating cavity and a slurry supply pipe communicating with the coating cavity.

[0009] A coating pad is provided with a plurality of slurry outlets. The coating pad is disposed between the upper die head and the lower die head, and the upper die head, the coating pad and the lower die head together form a slurry coating channel. The coating cavity is connected to the outlets, the outlets are connected to the coating channel, and the end of the coating channel forms a slurry coating port.

[0010] The pressure regulating block is formed by splicing together several sub-pressure regulating blocks of the same or different sizes. The pressure regulating block is located below the coating pad and corresponds to the position of each discharge port on the coating pad. The pressure regulating block is also located in the coating cavity.

[0011] And a number of cavity pressure sensors, which are disposed on the upper die head and / or the lower die head, and the number of cavity pressure sensors are respectively used to detect the pressure in the coating cavity corresponding to each discharge port.

[0012] Furthermore, a coating die head capable of detecting and adjusting the pressure of the coating cavity in sections: the coating cavity is configured as a hemispherical structure.

[0013] Furthermore, a coating die head capable of detecting and adjusting the pressure of the coating chamber in sections: the coating pad is also provided with several connecting holes, and the upper die head and the lower die head clamp the coating pad together through fixing bolts and connecting holes.

[0014] Furthermore, a coating die head capable of partitioning and adjusting the pressure of the coating cavity: the coating pad includes a pad body, the pad body having a first direction and a second direction perpendicular to each other; the pad body has a plurality of sequentially arranged discharge ports along the first direction and the openings of the discharge ports face the second direction.

[0015] Furthermore, a coating die head capable of zoned detection and adjustment of coating chamber pressure: the thickness of the gasket body is 0.1–2.0 mm.

[0016] Furthermore, a coating die head capable of detecting and adjusting the pressure of the coating cavity in sections: several of the sub-pressure adjustment blocks have the same or different widths in the second direction and the same or different lengths in the first direction.

[0017] Furthermore, a coating die head capable of zoned detection and adjustment of coating chamber pressure includes several sub-pressure adjustment blocks made of the same or different materials. That is, the several sub-pressure adjustment blocks can be made of the same or different materials.

[0018] Furthermore, a coating die head capable of partitioning and adjusting the pressure of the coating chamber: the sub-pressure regulating block is made of one or more of nickel, nickel-plated copper, and stainless steel.

[0019] Furthermore, a coating die head capable of detecting and adjusting the pressure of the coating cavity in sections: the coating speed of the coating die head is 10-80 m / min.

[0020] Furthermore, a coating die head capable of zoned detection and adjustment of coating chamber pressure is provided: the coating die head is suitable for coating slurries with a solid content of 50-75% and a viscosity of 3000-20000 mPa·s.

[0021] The beneficial effects of this utility model are:

[0022] (1) The coating die head designed in this utility model, which can detect and adjust the pressure of the coating chamber in sections, can detect the fluid pressure at each slurry outlet on the coating pad during the coating process through several chamber pressure sensors. If the pressure at a certain outlet is found to be high, the sub-pressure regulating block at the outlet with high pressure can be replaced by disassembling the coating die head and replacing it with a smaller sub-pressure regulating block. The smaller size of the sub-pressure regulating block can reduce the space occupied in the chamber at that outlet, increase the flow space of the slurry, and thus reduce the slurry flow rate at that outlet, thereby reducing the fluid pressure of the slurry. Therefore, the coating die head designed in this utility model can adjust the pressure at each outlet, thereby ensuring the consistency of pressure in all parts of the coating chamber when using the coating die head for coating, and solving the problem of uneven coating pressure in existing coating dies.

[0023] (2) The coating die head designed in this utility model can improve the coating surface density of the electrode sheet when coating the slurry, ensure the consistency of surface density, help improve the stability of the product process, reduce the amount of coating machine adjustment loss, and use the sensor design to provide an effective reference for pressure process adjustment, thereby improving the work efficiency; through the improvement of surface density consistency, the consistency of battery capacity is further improved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of 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.

[0025] Figure 1 A side view of a coating die head designed for embodiment 1 of this utility model, which can detect and adjust the pressure of the coating chamber in sections;

[0026] Figure 2 A front view of a coating die head with partitioned detection and adjustment of coating chamber pressure designed for Embodiment 1 of this utility model;

[0027] Figure 3 This is a schematic diagram of the assembly of the pressure regulating block and the coating gasket in Example 1;

[0028] Figure 4 This is a schematic diagram of the assembly of the pressure regulating block and the coating gasket in Comparative Example 1.

[0029] The markings in the diagram are: 1-Upper die head, 2-Lower die head, 3-Coating gasket, 4-Pressure regulating block, 5-Cavity pressure sensor, 6-Slurry supply pipe, 7-Coating channel, 8-Coating port, 21-Coating cavity, 31-Gasket body, 32-Outlet, 41-Sub-pressure regulating block. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0032] Example 1

[0033] like Figures 1-3 As shown, this embodiment 1 designs a coating die head that can detect and adjust the pressure of the coating chamber in sections. The coating die head includes:

[0034] The upper die head 1 has a flat surface on the side adjacent to the lower die head 2;

[0035] The lower die head 2 is located below the upper die head 1. The lower die head 2 is provided with a coating cavity 21 with a hemispherical structure and a slurry supply pipe 6 that communicates with the coating cavity 21.

[0036] A coating pad 3 includes a pad body 31, which has a first direction and a second direction perpendicular to each other. The pad body 31 has a plurality of slurry outlets 32 arranged sequentially along the first direction, with the openings of the outlets 32 facing the second direction. The pad body 31 also has a plurality of connecting holes. The coating pad 3 is disposed between the upper die head 1 and the lower die head 2 and clamped by fixing bolts and connecting holes. The upper die head 1, the coating pad 3, and the lower die head 2 together form a slurry coating channel 7. The coating cavity 21 communicates with the outlets 32, and the outlets 32 communicate with the coating channel 7. The end of the coating channel 7 forms a coating port 8. Specifically, as shown... Figure 3 The discharge port 32 in this embodiment 1 can be set to 4, and the thickness of the gasket body 31 in embodiment 1 can be set to 0.1~2.0mm;

[0037] The pressure regulating block 4 is formed by splicing together several sub-pressure regulating blocks 41 of the same or different sizes. The pressure regulating block 4 is located below the coating pad 3 and corresponds to the position of each discharge port 32 on the coating pad 3. At the same time, the pressure regulating block 4 is located in the coating cavity 21. Specifically, the sub-pressure regulating blocks 41 may have the same or different widths in the second direction and the same or different lengths in the first direction. The materials of the several sub-pressure regulating blocks 41 may be the same or different materials. Specifically, the materials may be one or more of nickel, nickel-plated copper, and stainless steel.

[0038] And a number of cavity pressure sensors 5, which are set on the upper die head 1 and correspond to the positions of each discharge port 32 on the coating pad 3. The number of cavity pressure sensors 5 are used to detect the pressure in the coating cavity 21 corresponding to each discharge port 32. Specifically, in embodiment 1, four cavity pressure sensors 5 can be set to correspond to four discharge ports 32 respectively.

[0039] Specifically, the coating die head designed in Embodiment 1 above, which allows for zoned detection and adjustment of the coating chamber pressure, includes an upper die head 1, a lower die head 2, and a coating pad 3. The lower die head 2 has a hemispherical cavity (coating chamber 21). The upper die head 1 and the lower die head 2 are tightly clamped together with fixing bolts to secure the coating pad 3. At this time, the coating chamber 21 is only connected to the outlet 32 ​​of the coating pad 3. The slurry supply pipe 6 is installed at the center position below the lower die head 2 (e.g., ...). Figure 1 (as shown) and directly connected to the coating cavity 21. The coating speed of the coating die in Example 1 is 10-80 m / min; the coating die is suitable for coating slurries with a solid content of 50-75% and a viscosity of 3000-20000 mPa·s.

[0040] During slurry feeding, the slurry flows from the coating chamber 21 to the outlet 32 ​​of the coating pad 3. In this embodiment 1, multiple small sub-pressure regulating blocks 41 (such as...) are designed according to the actual size of the outlet 32 ​​of the coating pad 3. Figure 3 As shown, the size of the sub-pressure regulating block 41 can be adjusted according to the pressure detected by the cavity pressure sensor 5 at different outlets 32, so that the lateral pressure in the die cavity is consistent (that is, the pressure in the first direction is consistent). Specifically, if the cavity pressure sensor 5 detects a larger pressure at the corresponding outlet 32, the sub-pressure regulating block 41 at that outlet 32 ​​is replaced with a smaller size, and vice versa.

[0041] Comparative Example 1

[0042] like Figure 4 As shown, the difference between Comparative Example 1 and Example 1 is that the pressure regulating block 4 in Comparative Example 1 is a fixed structure, which is different from the pressure regulating block 4 in Example 1, which is formed by splicing together multiple small-sized sub-pressure regulating blocks 4. Because the pressure regulating block 4 in Comparative Example 1 is not convenient to be replaced according to the data detected by the cavity pressure sensor 5, the rest of the structural settings of Comparative Example 1 are the same as those of Example 1.

[0043] The pressure regulating block 4 with the integral structure of Comparative Example 1 can regulate the pressure at the discharge port 32, but it can only regulate the pressure at all discharge ports 32 together. It cannot regulate the pressure at each discharge port 32 separately, nor can it guarantee the lateral consistency of the pressure in the cavity. Therefore, the pressure regulating block 4 with the integral structure of Comparative Example 1 has limitations in improving the surface density.

[0044] The pressure regulating block structure designed in the coating die head of Example 1 can flexibly respond to different abnormal trends in surface density by refining and combining the length of the pressure regulating block. This changes the limitation of the pressure regulating block in Comparative Example 1 in improving surface density. In conjunction with the cavity pressure sensor 5, it can more stably, quickly and efficiently adjust the pressure in the cavity, ensuring the lateral consistency of the pressure in the cavity, thereby ensuring the consistency of the surface density of the electrode coating.

[0045] The above-described preferred embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A coating die head capable of detecting and adjusting the pressure of the coating chamber in sections, characterized in that, The coating die head includes: Upper mold head (1); The lower die head (2) is located below the upper die head (1). The lower die head (2) is provided with a coating cavity (21) and a slurry supply pipe (6) communicating with the coating cavity (21). A coating pad (3) is provided with a plurality of slurry outlets (32). The coating pad (3) is provided between the upper die head (1) and the lower die head (2). The upper die head (1), the coating pad (3) and the lower die head (2) form a coating channel (7) for the slurry. The coating cavity (21) is connected to the outlets (32). The outlets (32) are connected to the coating channel (7). The end of the coating channel (7) forms a coating port (8). The pressure regulating block (4) is formed by splicing together several sub-pressure regulating blocks (41) of the same or different sizes. The pressure regulating block (4) is located below the coating pad (3) and corresponds to the position of each discharge port (32) on the coating pad (3). The pressure regulating block (4) is also located in the coating cavity (21). And a number of cavity pressure sensors (5) are disposed on the upper die head (1) and / or the lower die head (2), and the number of cavity pressure sensors (5) are respectively used to detect the pressure in the coating cavity (21) corresponding to each discharge port (32).

2. The coating die head with zoned detection and adjustment of coating chamber pressure according to claim 1, characterized in that, The coating cavity (21) is configured as a hemispherical structure.

3. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 1, characterized in that, The coating pad (3) is also provided with several connecting holes, and the upper die head (1) and the lower die head (2) clamp the coating pad (3) together by fixing bolts and connecting holes.

4. A coating die head capable of detecting and adjusting the pressure of the coating chamber in sections, as described in claim 1 or 3, characterized in that, The coated pad (3) includes a pad body (31) having a first direction and a second direction that are perpendicular to each other; The gasket body (31) is provided with a plurality of sequentially arranged outlets (32) along a first direction, and the opening of the outlets (32) faces a second direction.

5. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 4, characterized in that, The thickness of the gasket body (31) is 0.1 to 2.0 mm.

6. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 4, characterized in that, Several of the sub-pressure regulating blocks (41) have the same or different widths in the second direction and the same or different lengths in the first direction.

7. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 1, characterized in that, Several sub-pressure regulating blocks (41) may be made of the same or different materials.

8. A coating die head capable of detecting and adjusting the pressure of the coating chamber in sections, as described in claim 1 or 7, characterized in that, The material of the sub-pressure regulating block (41) is selected from one or more of nickel, nickel-plated copper, and stainless steel.

9. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 1, characterized in that, The coating speed of the coating die head is 10-80 m / min.

10. A coating die head with zoned detection and adjustment of coating chamber pressure according to claim 1, characterized in that, The coating die is suitable for coating slurries with a solid content of 50-75% and a viscosity of 3000-20000 mPa·s.

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