Coated gaskets and coating apparatus

Abstract

The application relates to a coating gasket and a coating device, the coating gasket comprising: a gasket body, the gasket body being provided with a first flow channel and a second flow channel, the second flow channel being provided with a first communication port; a sub-gasket, the sub-gasket being detachably connected with the gasket body, the sub-gasket being provided with a second discharge port, the second discharge port being communicated with the first communication port, and the second discharge port being used for outputting an auxiliary material; and a first discharge port, the first discharge port being arranged between the sub-gasket and the gasket body along a first direction, the first discharge port being communicated with the first flow channel, and the first discharge port being used for outputting a pole piece slurry. Through the technical scheme, the problem of low coating efficiency in the related art can be solved.

Description

Technical Field

[0001] This application relates to the field of coating apparatus technology, and in particular to coating gaskets and coating apparatus. Background Technology

[0002] The quality of battery electrode coating directly affects its energy density, safety, and lifespan. In the coating process, electrode slurry and auxiliary materials are coated onto the current collector to form the electrode. The coating die has a coating gasket with an outlet for discharging the electrode slurry. The coating gasket is a core component for controlling the flow of the electrode slurry; it is crucial for achieving precise distribution and stable flow of the slurry, and ultimately determines the final coating quality.

[0003] In related technologies, the width of the outlet of the coating pad remains constant. When producing battery cells of different widths, the entire coating pad needs to be replaced, resulting in a long replacement time and reduced coating efficiency. Furthermore, some coating pads only output electrode paste, requiring a change of production line when coating auxiliary materials, further reducing coating efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a coating pad and coating device to address the problem of low coating efficiency.

[0005] A coating pad, the coating pad comprising:

[0006] The gasket body has a first flow channel and a second flow channel, and the second flow channel has a first connecting port.

[0007] Sub-gasket, which is detachably connected to the gasket body, has a second discharge port that is connected to the first connecting port, and the second discharge port is used to output auxiliary materials;

[0008] The first discharge port is disposed between the sub-gasket and the gasket body along the first direction. The first discharge port is connected to the first flow channel and is used to output electrode slurry.

[0009] In one embodiment, the gasket body and the sub-gasket have a snap-fit ​​structure to limit the displacement of the sub-gasket relative to the gasket body along a first direction and a second direction, the second direction being perpendicular to the first direction.

[0010] In one embodiment, the snap-fit ​​structure includes:

[0011] The first slot is set on the sub-gasket;

[0012] The first protrusion is disposed on the gasket body and is disposed in the first slot to limit the displacement of the sub-gasket relative to the gasket body along the first direction.

[0013] In one embodiment, the first slot has a first arcuate surface, the first protrusion has a second arcuate surface, and the first arcuate surface and the second arcuate surface are in contact with each other.

[0014] In one embodiment, the snap-fit ​​structure further includes:

[0015] A limiting groove is provided on the inner wall of the first slot;

[0016] A limiting protrusion is provided on the first protrusion and in the limiting groove to limit the displacement of the sub-gasket relative to the gasket body in the second direction.

[0017] In one embodiment, the sub-gasket is provided with a first chamfer structure, and the distance between the first chamfer structure and the gasket body gradually increases along a first direction.

[0018] In one embodiment, the sub-pad includes:

[0019] The first main body has a second discharge port;

[0020] The first flow-blocking section is disposed on the side of the first main body near the first discharge port. The first flow-blocking section is used to reduce the flow rate of the end electrode slurry at the first discharge port along the first direction.

[0021] In one embodiment, the coating pad includes two sub-pads, which are detachably connected to both ends of the pad body along a first direction. The pad body also has a third flow channel and two third discharge ports, which are connected to the third flow channel. The third flow channel and the two third discharge ports are located between the two sub-pads. The third flow channel is used to output auxiliary materials.

[0022] A coating apparatus includes an upper die head, a lower die head, and the aforementioned coating pad. The upper die head and the lower die head are detachably connected, and the coating pad is disposed between the upper die head and the lower die head. The coating pad is detachably disposed on the lower die head.

[0023] In one embodiment, the lower die head has a first feed channel and a second feed channel that are independent of each other, the first feed channel being connected to the first channel and the second feed channel being connected to the second channel.

[0024] The aforementioned coating pad has a sub-pad detachably connected to the pad body. A first outlet is positioned between the sub-pad and the pad body along a first direction; that is, the gap between the sub-pad and the pad body along the first direction forms the first outlet. The sub-pad limits the width of the first outlet. The first outlet is used to output the electrode slurry in the first flow channel, and the second outlet is used to output auxiliary materials in the second flow channel for the coating process. With this structure, when producing battery cells of different widths, it is not necessary to replace the entire coating pad; only sub-pads of different specifications need to be replaced. Different specifications of sub-pads have different dimensions along the first direction. Replacing sub-pads with different specifications changes the gap between the sub-pad and the pad body along the first direction, thereby changing the width of the first outlet. This design reduces the difficulty of replacing the coating pad, thus reducing the replacement time, improving the replacement efficiency, and consequently improving coating efficiency. It also shortens downtime and significantly improves the production line's response speed to multi-specification, small-batch, and customized production needs. Furthermore, the coating pad can simultaneously output electrode slurry and auxiliary materials without changing the production line, further improving coating efficiency. Attached Figure Description

[0025] Figure 1 An exploded view of the coated gasket;

[0026] Figure 2 This is a schematic diagram of the coated gasket structure;

[0027] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0028] Figure 4 This is a schematic diagram of the sub-gasket structure;

[0029] Figure 5 A structural schematic diagram of the sub-gasket from another perspective;

[0030] Figure 6 A schematic diagram of the structure in which the limiting protrusion and the first protrusion cooperate;

[0031] Figure 7 This is a top view of the gasket body;

[0032] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0033] Figure 9 This is a schematic diagram of the coating device.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Coated gaskets;

[0036] 110. Gasket body; 111. First flow channel; 112. Second flow channel; 1121. First connecting port; 1122. Second connecting port; 113. Third flow channel; 1131. Third connecting port; 114. Third discharge port; 115. Second main body; 116. Connecting part; 117. Second flow-blocking part;

[0037] 120. Sub-gasket; 121. Second discharge port; 122. First chamfered structure; 123. First main body; 124. First flow-blocking part;

[0038] 130. First discharge port;

[0039] 140. Snap-fit ​​structure;

[0040] 141. First groove; 142. First protrusion;

[0041] 143. Limiting groove; 144. Limiting protrusion;

[0042] 145. Second groove; 146. Second protrusion;

[0043] 200. Upper mold head;

[0044] 300, lower die head; 310, first feed channel; 320, second feed channel; 330, material leveling chamber; 340, third feed channel. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship 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.

[0047] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0051] See Figure 1 and Figure 2One embodiment of this application provides a coating gasket, which includes a gasket body 110, a sub-gasket 120, and a first outlet 130. The gasket body 110 has a first flow channel 111 and a second flow channel 112, the second flow channel 112 having a first connecting port 1121. The sub-gasket 120 is detachably connected to the gasket body 110 and has a second outlet 121, which communicates with the first connecting port 1121. The second outlet 121 is used to output auxiliary materials. The first outlet 130 is disposed between the sub-gasket 120 and the gasket body 110 along a first direction, extends along the first direction, communicates with the first flow channel 111, and is used to output electrode slurry. (See also...) Figure 2 The X direction is the first direction, and the Y direction is the second direction. Furthermore, the first direction is the width direction of the electrode produced by the coating process, and the first direction is also the width direction of the first discharge port 130. The second direction is the length direction of the electrode produced by the coating process.

[0052] Using the technical solution of this application, the sub-gasket 120 and the gasket body 110 are detachably connected. A first outlet 130 is disposed between the sub-gasket 120 and the gasket body 110 along a first direction. That is, the interval between the sub-gasket 120 and the gasket body 110 along the first direction forms the first outlet. The sub-gasket 120 can limit the width of the first outlet 130. The first outlet 130 is used to output the electrode slurry in the first flow channel 111, and the second outlet 121 is used to output the auxiliary material in the second flow channel 112 for the coating process. With the above structure, when it is necessary to produce battery cells of different widths, it is not necessary to replace the entire coating gasket; only the sub-gasket 120 of different specifications needs to be replaced. The dimensions of the sub-gasket 120 of different specifications along the first direction are different. Replacing the sub-gasket 120 with a different specification can change the interval between the sub-gasket 120 and the gasket body 110 along the first direction, thereby changing the width of the first outlet 130. This setup reduces the difficulty of replacing the coating pad, thereby reducing the time required for replacement, increasing the efficiency of the coating pad replacement, and ultimately improving coating efficiency. It also shortens downtime and significantly improves the production line's responsiveness to multi-specification, small-batch, and customized production needs. Furthermore, the coating pad can simultaneously output electrode slurry and auxiliary materials without requiring production line changes, further enhancing coating efficiency.

[0053] In related technologies, the entire coating gasket needs to be replaced, resulting in a large number of spare coating gaskets and increased manufacturing costs. However, in this application, only 120 spare sub-gaskets need to be processed, significantly reducing manufacturing costs.

[0054] In some embodiments, the dimensions of the second outlet 121 of the sub-gaskets 120 of different specifications along the first direction can also be designed to be different values.

[0055] In some embodiments, the auxiliary material is a ceramic slurry, which can form a ceramic protective layer to enhance the mechanical properties and heat resistance of the electrode. The electrode slurry forms an active layer.

[0056] In some embodiments, the first discharge port 130 and the second discharge port 121 have the same opening direction, both facing the second direction.

[0057] In some embodiments, the dimension of the first flow channel 111 along the first direction is greater than the dimension of the second flow channel 112 along the first direction. This also allows the active layer thickness to be greater than the ceramic protective layer thickness, effectively preventing bulging edges from forming during the winding of the battery electrode.

[0058] participate Figure 3 A snap-fit ​​structure 140 is provided between the gasket body 110 and the sub-gasket 120. The snap-fit ​​structure 140 restricts the displacement of the sub-gasket 120 relative to the gasket body 110 along a first direction and a second direction, wherein the second direction is perpendicular to the first direction. This configuration allows the snap-fit ​​structure 140 to pre-position the sub-gasket 120, facilitating subsequent fixing of the sub-gasket 120. Furthermore, the snap-fit ​​structure 140 eliminates the need for additional tools for fixing and disassembly, simplifying the workflow and further improving work efficiency.

[0059] See Figures 4 to 6 The snap-fit ​​structure 140 includes a first slot 141 and a first protrusion 142. The first slot 141 is disposed on the sub-gasket 120. The first protrusion 142 is disposed on the gasket body 110, and is located within the first slot 141. The outer sidewall of the first protrusion 142 along the first direction abuts against the inner sidewall of the first slot 141 along the first direction, thereby limiting the displacement of the sub-gasket 120 relative to the gasket body 110 along the first direction. This configuration allows for accurate alignment of the sub-gasket 120 and the gasket body 110 through the first slot 141 and the first protrusion 142, improving the assembly accuracy of the sub-gasket 120.

[0060] In some embodiments, the first slot 141 extends along a second direction, and the first protrusion 142 extends along a second direction. This configuration allows the sub-gasket 120 to slide along the second direction onto the gasket body 110, facilitating the installation of the sub-gasket 120 onto the gasket body 110.

[0061] In some embodiments, the snap-fit ​​structure 140 includes a second slot 145 and a second protrusion 146. The second protrusion 146 is disposed on the sub-gasket 120. The second slot 145 is disposed on the gasket body 110, and the second protrusion 146 is disposed within the second slot 145. The outer sidewall of the second protrusion 146 along the first direction abuts against the inner sidewall of the second slot 145 along the first direction to limit the displacement of the sub-gasket 120 relative to the gasket body 110 along the first direction. This configuration, through the second slot 145 and the second protrusion 146, further enables accurate alignment of the sub-gasket 120 and the gasket body 110. Furthermore, it facilitates the processing of the sub-gasket 120 and the gasket structure, and also facilitates fixing the sub-gasket 120 to the gasket structure, avoiding interference between the sub-gasket 120 and the gasket structure.

[0062] In some embodiments, the second protrusion 146 extends along a second direction, and the second slot 145 extends along a second direction. This arrangement facilitates the processing of the sub-gasket 120 and the gasket body 110.

[0063] Specifically, the first groove 141 has a first arc-shaped surface, and the first protrusion 142 has a second arc-shaped surface, with the first and second arc-shaped surfaces fitting together. This arrangement increases the contact area between the first groove 141 and the first protrusion 142, resulting in a more uniform distribution of contact stress and preventing stress concentration. Simultaneously, it reduces the impact generated when the sub-gasket 120 is fixed to the gasket body 110, preventing damage to both the sub-gasket 120 and the gasket body 110, and improving the service life of the coated gasket.

[0064] In some embodiments, the second slot 145 has a third arcuate surface, and the second protrusion 146 has a fourth arcuate surface, with the third and fourth arcuate surfaces fitting together. This arrangement increases the contact area between the second slot 145 and the second protrusion 146, resulting in a more uniform distribution of contact stress and preventing stress concentration. Simultaneously, it reduces the impact generated when the sub-gasket 120 is fixed to the gasket body 110, preventing damage to the sub-gasket 120 and the gasket body 110, and improving the service life of the coated gasket.

[0065] Furthermore, the snap-fit ​​structure 140 also includes a limiting groove 143 and a limiting protrusion 144. The limiting groove 143 is disposed on the inner wall of the first slot 141. The limiting protrusion 144 is disposed on the first protrusion 142 and is located within the limiting groove 143 to limit the displacement of the sub-gasket 120 relative to the gasket body 110 in the second direction. This arrangement can prevent the sub-gasket 120 from displacing relative to the gasket body 110 in the second direction. At the same time, the limiting protrusion 144 is located behind the limiting groove 143, which is clearly perceptible to the operator, thus helping to determine whether the sub-gasket 120 is assembled correctly and preventing the coating quality from being affected by improper installation. Additionally, no additional limiting parts are needed, facilitating the processing of the sub-gasket 120 and the gasket body 110.

[0066] In related technologies, coating pads make it difficult to control the flow of electrode slurry inside the coating die, which easily leads to uneven flow field distribution between the end and center regions of the electrode slurry during output in the first direction. Because the electrode slurry experiences abrupt changes in flow resistance and pressure distribution imbalance at the end of the first outlet 130, the thickness of the active layer at the end is easily greater than that in the center region, severely affecting the uniformity of coating surface density and thus reducing the overall battery performance. The end of the first outlet 130 refers to the end along the first direction.

[0067] See Figure 4 The sub-pad 120 is provided with a first chamfer structure 122, and the distance between the first chamfer structure 122 and the pad body 110 gradually increases along the first direction. With this structure, the first chamfer structure 122 gradually increases the distance between the sub-pad 120 and the pad body 110 along the first direction, thereby causing the width of the first outlet 130 to gradually increase along the direction from the first flow channel 111 to the first outlet 130. This configuration allows the first chamfer structure 122 to guide the electrode slurry at the end, reducing eddies or dead zones in the electrode slurry at the end of the first outlet 130, promoting smooth flow of the electrode slurry, optimizing the flow field distribution of the electrode slurry, preventing the thickness of the active layer at the end from being greater than the thickness of the central region, ensuring uniform coating density, and improving battery performance.

[0068] In some embodiments, the first chamfer structure 122 is disposed at the end of the sub-gasket 120 away from the first flow channel 111.

[0069] Furthermore, the sub-gasket 120 includes a first main body portion 123 and a first flow-blocking portion 124. The first main body portion 123 has a second outlet 121. The first flow-blocking portion 124 is disposed on the side of the first main body portion 123 near the first outlet 130, and the first flow-blocking portion 124 is used to reduce the flow rate of the end electrode slurry at the first outlet 130 along the first direction. With this configuration, the first flow-blocking portion 124 can obstruct the flow of slurry towards the end of the first outlet 130, actively adjusting the flow rate distribution of the electrode slurry in the first direction of the first outlet 130, suppressing excessive outflow of the end electrode slurry, thereby solving the problem of excessive flow rate at the end of the first outlet 130 due to edge effects. This avoids excessive thickness at the electrode end, facilitating electrode winding.

[0070] In some embodiments, the thickness of the first flow-blocking portion 124 is less than the thickness of the first main body portion 123.

[0071] In some embodiments, the thickness at the end of the protective layer is reduced by 5% to 20% compared to the thickness of the central region.

[0072] See Figure 7 and Figure 8 The coating pad includes two sub-pads 120, which are detachably connected to both ends of the pad body 110 along a first direction. The pad body 110 also has a third flow channel 113 and two third discharge ports 114, both of which are connected to the third flow channel 113. The third flow channel 113 and the two third discharge ports 114 are located between the two sub-pads 120. The third flow channel 113 is used to output auxiliary materials. A first flow channel 111 and a first discharge port 130 are located between the third flow channel 113 and the two sub-pads 120. With this configuration, after the coating process, the finished product can be cut to generate two electrode sheets, thereby improving production efficiency.

[0073] In some embodiments, the gasket body 110 includes a second main body portion 115 and a connecting portion 116. Sub-gaskets 120 are detachably connected to the second main body portion 115, and the connecting portion 116 is fixedly connected to the second main body portion 115. A third flow channel 113 is disposed on the second main body portion 115 and the connecting portion 116, and a third discharge port 114 is disposed on the connecting portion 116. Specifically, the connecting portion 116 and the two sub-gaskets 120 each have a first flow channel 111 and a first discharge port 130, respectively.

[0074] In some embodiments, the two ends of the connecting portion 116 are respectively provided with two second chamfer structures, one of the second chamfer structures and one of the first chamfer structures 122 are respectively provided at the two ends of a first discharge port 130, and the other second chamfer structure and the other first chamfer structure 122 are respectively provided at the two ends of another first discharge port 130.

[0075] In some embodiments, two second flow-blocking portions 117 are respectively provided at both ends of the connecting portion 116, and the two second flow-blocking portions 117 are respectively located at one end of the two first discharge ports 130.

[0076] With this configuration, the first chamfer structure 122, the second chamfer structure, the first flow-blocking part 124, and the second flow-blocking part 117 work together to prevent the active layer from being too thick at both ends along the first direction, thereby preventing the bulging phenomenon during the winding of the electrode sheet.

[0077] See Figure 9 Another embodiment of this application provides a coating apparatus, which includes an upper die head 200, a lower die head 300, and the aforementioned coating pad 100. The upper die head 200 and the lower die head 300 are detachably connected, and the coating pad 100 is disposed between the upper die head 200 and the lower die head 300, and is detachably disposed on the lower die head 300. With this configuration, when it is necessary to produce battery cells of different widths, it is not necessary to replace the entire coating pad 100 of the coating apparatus; only the sub-pad 120 needs to be replaced. This reduces the difficulty of replacing the coating pad 100, thereby reducing the time required for replacing the coating pad 100, improving the replacement efficiency of the coating pad 100, and thus improving the coating efficiency and shortening the downtime of the coating apparatus.

[0078] In some embodiments, the upper die head 200 and the lower die head 300 are detachably connected by bolts.

[0079] In some embodiments, the gasket body 110 and the sub-gasket 120 are detachably connected to the lower die head 300 by bolts.

[0080] Specifically, the lower die head 300 has a first feed channel 310 and a second feed channel 320 that are independent of each other. The first feed channel 310 is connected to the first channel 111, and the second feed channel 320 is connected to the second channel 112. This arrangement ensures that the electrode slurry and auxiliary materials are transported separately, avoiding cross-contamination between the electrode slurry and auxiliary materials. The independent first feed channel 310 and second feed channel 320 allow for independent control of parameters such as the transport pressure and flow rate of the electrode slurry and auxiliary materials, improving the flexibility of the coating process.

[0081] In some embodiments, the lower die head 300 has a uniform material cavity 330, which is connected to the first feed channel 310 and two first channels 111 respectively. This configuration can improve the uniformity of electrode slurry flow and avoid excessive or insufficient electrode slurry in some areas.

[0082] In some embodiments, the second flow channel 112 has a second communication port 1122, which is connected to the second feed flow channel 320.

[0083] In some embodiments, the lower die head 300 has a third feed channel 340, the third channel 113 has a third connecting port 1131, and the third connecting port 1131 is connected to the third feed channel 340.

[0084] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coated gasket, characterized in that, The coated pad includes: Gasket body (110), the gasket body (110) having a first flow channel (111) and a second flow channel (112), the second flow channel (112) having a first connecting port (1121). Sub-gasket (120), the sub-gasket (120) is detachably connected to the gasket body (110), the sub-gasket (120) has a second discharge port (121), the second discharge port (121) is connected to the first communication port (1121), and the second discharge port (121) is used to output auxiliary materials; The first discharge port (130) is disposed between the sub-gasket (120) and the gasket body (110) along the first direction. The first discharge port (130) is connected to the first flow channel (111) and is used to output electrode slurry.

2. The coated gasket according to claim 1, characterized in that, The gasket body (110) and the sub-gasket (120) have a snap-fit ​​structure (140) to restrict the displacement of the sub-gasket (120) relative to the gasket body (110) along a first direction and a second direction, the second direction being perpendicular to the first direction.

3. The coated gasket according to claim 2, characterized in that, The snap-fit ​​structure (140) includes: A first slot (141) is provided on the sub-gasket (120); A first protrusion (142) is disposed on the gasket body (110) and disposed within the first slot (141) to limit the displacement of the sub-gasket (120) relative to the gasket body (110) along the first direction.

4. The coated gasket according to claim 3, characterized in that, The first slot (141) has a first arc-shaped surface, and the first protrusion (142) has a second arc-shaped surface, and the first arc-shaped surface and the second arc-shaped surface are in contact with each other.

5. The coated gasket according to claim 3, characterized in that, The snap-fit ​​structure (140) also includes: A limiting groove (143) is provided on the inner wall of the first slot (141); A limiting protrusion (144) is disposed on the first protrusion (142) and disposed in the limiting groove (143) to limit the displacement of the sub-gasket (120) relative to the gasket body (110) in the second direction.

6. The coated gasket according to claim 1, characterized in that, The sub-gasket (120) is provided with a first chamfer structure (122), and the distance between the first chamfer structure (122) and the gasket body (110) gradually increases along the first direction.

7. The coated gasket according to claim 1, characterized in that, The sub-gasket (120) includes: The first main body (123) has a second discharge port (121). The first flow-blocking part (124) is disposed on the side of the first main body (123) near the first discharge port (130). The first flow-blocking part (124) is used to reduce the flow rate of the end electrode slurry of the first discharge port (130) along the first direction.

8. The coated gasket according to claim 1, characterized in that, The coating pad includes two sub-pads (120), which are detachably connected to the two ends of the pad body (110) along the first direction. The pad body (110) also has a third flow channel (113) and two third discharge ports (114). The two third discharge ports (114) are connected to the third flow channel (113). The third flow channel (113) and the two third discharge ports (114) are disposed between the two sub-pads (120). The third flow channel (113) is used to output auxiliary materials.

9. A coating apparatus, characterized in that, The coating apparatus includes an upper die head (200), a lower die head (300), and a coating pad (100) as described in any one of claims 1 to 8. The upper die head (200) and the lower die head (300) are detachably connected. The coating pad (100) is disposed between the upper die head (200) and the lower die head (300), and the coating pad (100) is detachably disposed on the lower die head (300).

10. The coating apparatus according to claim 9, characterized in that, The lower die head (300) has a first feed channel (310) and a second feed channel (320) that are independent of each other. The first feed channel (310) is connected to the first channel (111), and the second feed channel (320) is connected to the second channel (112).

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