CN220532070U - Coating die head and coating device - Google Patents

Abstract

The application provides a coating die head, which comprises a discharge cavity, wherein the discharge cavity is provided with a first feed inlet and a second feed inlet which are oppositely arranged, and the discharge cavity is also provided with a discharge outlet; the feeding direction of the discharging cavity and the discharging direction form an included angle; the slurry exits the coating die from the discharge port. Wherein, the feeding direction is the direction when the slurry flows into the discharging cavity from the first feeding port and the second feeding port; the discharge direction is the direction when the slurry flows out from the discharge port. In the above technical scheme, because the first feed inlet and the second feed inlet are arranged oppositely, and the feed direction and the discharge direction have an included angle, the slurry entering from the first feed inlet and the second feed inlet can collide with each other to offset a part of kinetic energy, and then the slurry is diverted to leave the die head from the discharge outlet. Because the kinetic energy of the slurry is consumed in the die head, the impact on the proton membrane is small in the process of coating the slurry on the surface of the proton membrane, and the condition that the thickness of the coated slurry on the length of a discharge hole is uneven can be effectively reduced.

Description

Coating die head and coating device

Technical Field

The application relates to the technical field of coating, in particular to a coating die head and a coating device.

Background

In the conventional coating die, in the coating process, the thickness of the slurry at both ends is thick in the length direction of the discharge port, so that the thickness of the coating is not uniform.

Disclosure of Invention

An object of the present application is to provide a coating die to make the thickness of the coated slurry in the length direction of the discharge port more uniform.

Embodiments of the present application are implemented as follows:

in a first aspect, embodiments of the present application provide a coating die, including a discharge cavity having a first feed port and a second feed port disposed opposite to each other, the discharge cavity further having a discharge port; the feeding direction of the discharging cavity and the discharging direction form an included angle; the slurry leaves the coating die head from the discharge port;

wherein, the feeding direction is the direction when the slurry flows into the discharging cavity from the first feeding port and the second feeding port; the discharge direction is the direction when the slurry flows out from the discharge port.

In the above technical scheme, because the first feed inlet and the second feed inlet are arranged oppositely, and the feed direction and the discharge direction have an included angle, the slurry entering from the first feed inlet and the second feed inlet can collide with each other to offset a part of kinetic energy, and then the slurry is diverted to leave the die head from the discharge outlet. When the coating die head provided by the technical scheme is used for coating production, the kinetic energy of the slurry is consumed in the die head, so that the slurry is coated on the surface of the proton membrane, the impact on the proton membrane is small, and the thickness of the coated slurry on the length of the discharge port can be effectively reduced.

In combination with the first aspect, in some embodiments, the feed direction at the first feed port location is on the same line as the feed direction at the second feed port location, such that slurry entering the discharge chamber from the first feed port and the second feed port can move in opposition along the same line.

In the technical scheme, as the slurry entering the discharge cavity from the first feed inlet and the second feed inlet moves along the same straight line in opposite directions, more kinetic energy of the slurry can be offset, and the condition that the thickness of the coated slurry on the length of the discharge hole is uneven is further improved.

In combination with the first aspect, in some embodiments, the discharge direction and the feed direction are mutually perpendicular.

In combination with the first aspect, in some embodiments, the discharge chamber has a guide slot, the first feed opening is located at a first end of the guide slot, the second feed opening is located at a second end of the guide slot, and the guide slot is configured to move slurry entering the discharge chamber in an extension direction of the guide slot.

In the above technical scheme, the slurry entering the discharge cavity moves along the guide groove by arranging the guide groove, and after the slurry enters the discharge cavity from the first feed inlet and the second feed inlet, the slurry can collide better under the guiding action of the guide groove so as to offset the kinetic energy, and the condition that the thickness of the coated slurry on the length of the discharge hole is uneven is further improved.

With reference to the first aspect, in some embodiments, the device further includes a feeding chamber, the feeding chamber is configured to communicate with the feeding pipeline, a first end of the feeding chamber is communicated with a first feeding port of the discharging chamber through a first connecting runner, and a second end of the feeding chamber is communicated with a second feeding port of the discharging chamber through a second connecting runner.

With reference to the first aspect, in some embodiments, the first connecting runner and the second connecting runner each include an arc segment and a straight segment that are connected to each other; the arc section is used for changing the flow direction of slurry in the process of moving the slurry from the feeding cavity to the discharging cavity, the extending direction of the straight line section is parallel to the extending direction of the guiding groove, and the straight line section is connected with the guiding groove.

According to the technical scheme, the straight line sections in the first connecting flow channel and the second connecting flow channel are parallel to the extending direction of the guide groove, so that the slurry can move according to the extending direction of the guide groove before entering the discharging cavity, the slurry can better move along the guide groove after entering the discharging cavity, and the condition that the thickness of the coated slurry on the length of the discharging hole is uneven is further improved.

With reference to the first aspect, in some embodiments, the die comprises an upper die, a lower die, and a gasket between the upper die and the lower die, the gasket being provided with a gap;

the first surface of the lower die head is provided with a first groove, a second groove, a first connecting groove and a second connecting groove; one end of the first connecting groove is connected with one end of the first groove, and the other end of the first connecting groove is connected with one end of the second groove; one end of the second connecting groove is connected with the other end of the first groove, and the other end of the second connecting groove is connected with the other end of the second groove;

the first side surface of the gasket is covered on the first surface of the lower die head to form a feeding cavity, a first connecting flow passage and a second connecting flow passage;

the gap of the gasket is positioned above the second groove; the upper die head, the gap of the gasket and the lower die head jointly enclose a discharging cavity; the second groove forms a guide groove.

In the technical scheme, the feeding cavity, the discharging cavity, the first connecting flow channel and the second connecting flow channel can be obtained by combining the lower die head with other parts after processing, so that the processing difficulty can be reduced.

In combination with the first aspect, in some embodiments, the second groove extends along a straight line, and both ends of the second groove are covered by the gasket, so as to form a straight line section at one end of the first connecting flow channel and one end of the second connecting flow channel.

In the above technical scheme, the guide groove is formed by the second groove, and the second groove extends along the straight line, and the two ends of the second groove are covered by the gasket to form the straight line section positioned at the end parts of the first connecting flow channel and the second connecting flow channel, so that before the slurry enters the discharging cavity through the first connecting flow channel and the second connecting flow channel, the slurry can move along the straight line section for a certain distance, after the slurry enters the discharging cavity, the slurry can better move along the second groove, namely the guide groove in the discharging cavity, and the uneven thickness of the coated slurry on the length of the discharging hole is further improved.

In combination with the first aspect, in some embodiments, the depth of the first groove is greater than the depth of the second groove.

In a second aspect, embodiments of the present application provide a coating apparatus comprising the coating die provided in the first aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a coating die according to an embodiment of the present application;

FIG. 2 is a schematic view of a first surface of a lower die in a coating die according to an embodiment of the present application;

FIG. 3 is a schematic view of a gasket in a coating die according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a combination of a lower die and a shim in a coating die according to an embodiment of the present application;

fig. 5 is a schematic diagram of a feeding cavity, a first connecting runner, a second connecting runner and a discharging cavity in a coating die according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of an ejection chamber in a coating die according to an embodiment of the present application.

Icon: 100-lower die head; 110-a first groove; 120-a second groove; 130-a first connecting slot; 140-a second connecting groove; 200-a gasket; 210-notch; 300-upper die head; 400-a discharge cavity; 410-a discharge port; 420-guiding groove; 500-feeding chambers; 600-first connecting flow channel; 610-arc segment; 620-straight line segment.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the product of the application, are merely for convenience of description of the present application and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The inventors of the present application found that, in the process of coating a slurry on a proton membrane by a coating process during the production of a fuel cell, the thickness dimension of the slurry coated on the surface of the proton membrane in the length direction of the discharge port of the die head is affected by the impact force of the slurry. In the case of large slurry impact force, the thickness of the slurry at the positions corresponding to the two ends of the discharge hole on the proton membrane is thicker in the length direction of the discharge hole of the die head, and the thickness of the slurry at the middle part of the discharge hole is thinner. The reason is that under the condition of larger impact force of the slurry, the slurry can move on the surface of the proton membrane along the two ends of the length direction of the discharge port, and the slurry on the proton membrane is thicker at the two ends of the discharge port and thinner in the middle part of the discharge port due to the influence of the surface tension of the slurry and other factors. Wherein, the length direction of discharge gate is the extending direction of discharge gate.

Based on this, the present application provides a coating die that reduces the impact force of the slurry as it flows out of the discharge opening 410 of the die by properly configuring the internal structure of the die.

The coating die provided herein includes an ejection cavity 400, the ejection cavity 400 having a first feed port and a second feed port disposed opposite to each other. The slurry enters the discharge cavity 400 through the first feed inlet and the second feed inlet, and the movement direction of the slurry entering the discharge cavity 400 is the feed direction of the discharge cavity 400. As shown in fig. 1, the discharge cavity 400 further has a discharge port 410, and the discharge port 410 of the discharge cavity 400 is the discharge port 410 of the coating die provided in the application. The movement direction of the slurry flowing out of the discharge port 410 is the discharge direction of the discharge cavity 400.

In the coating die head provided by the application, an included angle is formed between the feeding direction and the discharging direction. It should be understood by those skilled in the art that, because of the included angle between the feeding direction and the discharging direction, the slurry does not directly flow out of the discharging port 410 along the feeding direction after entering the discharging cavity 400, but is disposed opposite to the first feeding port and the second feeding port, and the slurry has a component opposite to the feeding direction at the positions of the first feeding port and the second feeding port.

In the process of coating by adopting the coating die head provided by the application, slurry can mutually collide after entering the discharge cavity 400 from the first feed inlet and the second feed inlet, so that part of kinetic energy of the slurry is lost, and then the slurry flows out from the discharge hole 410, and therefore, the impact force of the slurry when flowing out from the discharge hole 410 can be reduced.

In some embodiments of the present application, as shown in fig. 5, the feeding direction at the first feed port position and the feeding direction at the second feed port position are on the same straight line and opposite in direction (i.e., opposite directions shown by arrows in fig. 5), so that the slurry entering the discharge chamber 400 from the first feed port and the second feed port can move in opposite directions along the same straight line. That is, in the coating die provided in the above embodiment, the kinetic energy of the slurry entering from the first inlet and the second inlet can be completely counteracted theoretically, and then the slurry in the discharge cavity 400 flows out from the discharge port 410 under the pushing of the slurry entering subsequently, so as to further improve the situation that the thickness of the coated slurry is uneven over the length of the discharge port 410. Of course, the fact that the feeding direction at the first feeding port position and the feeding direction at the second feeding port position are located on the same straight line is only a preferred embodiment of the present application, and in other embodiments, the feeding direction at the first feeding port position and the feeding direction at the second feeding port position may also have a certain included angle, so that the kinetic energy of the slurry entering from the first feeding port and the second feeding port partially counteracts.

Preferably, the feeding direction and the discharging direction are mutually perpendicular. The slurry collides in the feeding direction, and the kinetic energy is counteracted, so that the slurry flows out of the discharge hole 410 only under the pushing of the slurry which enters subsequently, and the impact force when the slurry flows out is further reduced.

In some preferred embodiments of the present application, as shown in fig. 1, 5 and 6, the discharge chamber 400 provided in the present application has a guide groove 420, wherein the guide groove 420 is a groove-like structure for guiding. The first feed port is located at a first end of the guide groove 420, and the second feed port is located at the other end of the guide groove 420. By providing the guiding groove 420, the slurry entering the discharge cavity 400 from the first feeding port and the second feeding port moves along the guiding groove 420, and the slurry is further enabled to collide better to offset the kinetic energy.

Of course, in other embodiments, the guide groove 420 may not be provided, and after the slurry enters the discharge cavity 400 from the first inlet and the second inlet, the slurry entering from the first inlet and the second inlet can still collide due to inertia of the slurry.

In some embodiments of the present application, as shown in fig. 1 and 5, the coating die provided herein further has a feeding cavity 500, the feeding cavity 500 is used for communicating with a feeding pipeline, a first end of the feeding cavity 500 is communicated with a first feeding port of the discharging cavity 400 through a first connecting flow channel 600, and a second end of the feeding cavity 500 is communicated with a second feeding port of the discharging cavity 400 through a second connecting flow channel. The slurry enters the feeding cavity 500 through the feeding pipeline, and then is respectively communicated with the first feeding port and the second feeding port through the first connecting flow channel 600 and the second connecting flow channel. Further, in some preferred embodiments, the feed conduit communicates with the feed chamber 500 at a location intermediate the first end and the second end.

In the above embodiment, the slurry can be introduced from both ends (i.e., the first inlet and the second inlet) of the discharge chamber 400 through only one feeding pipe, thereby simplifying the pipe connected in use. Of course, in other embodiments, the feeding chamber 500 may not be provided, and the first feeding port and the second feeding port of the feeding chamber 500 may be connected through two feeding pipes, respectively.

Further, in order to enable the slurry to better move along the guide groove 420 after entering the discharge cavity 400 from the first feeding port and the second feeding port, in some embodiments of the present application, as shown in fig. 5, the first connecting flow channel 600 and the second connecting flow channel each include an arc segment 610 and a straight segment 620, wherein the arc segment 610 is connected with the feeding cavity 500, the straight segment 620 is connected with the feeding port of the discharge cavity 400, and the extending direction of the straight segment 620 is parallel to the extending direction of the guide groove 420. That is, after the slurry in the feeding chamber 500 sequentially passes through the arc section 610 and the straight line section 620 in the first connecting channel 600, the slurry enters the discharging chamber 400 from the first feeding port, the arc section 610 in the first connecting channel 600 is used for changing the flow direction of the slurry, and the straight line section 620 is used for stabilizing the flow direction of the slurry, so that the slurry can flow better according to the extending direction of the guiding slot 420 after entering the discharging chamber 400 through the first feeding port. Specifically, the first connecting flow channel 600 and the second connecting flow channel provided in the present application may have a U-shape or a circular arc shape.

In the above embodiment, the first connecting flow channel 600 and the second connecting flow channel enable the slurry entering the discharge cavity 400 to better move along the direction of the guide groove 420 through the straight line segment 620, so that the kinetic energy of the slurry can be better counteracted, and the uneven thickness of the coated slurry on the length of the discharge port 410 is further improved.

Of course, in some embodiments of the present application, the first connecting channel 600 and the second connecting channel may not include the straight line segment 620 and only include the arc segment 610. In some embodiments, the first connection flow channel 600 and the second connection flow channel each extend along an arc, and an extending direction of an end of the first connection flow channel 600 connected to the guide groove 420 is parallel to an extending direction of the guide groove 420, and an extending direction of an end of the second connection flow channel connected to the guide groove 420 is parallel to an extending direction of the guide groove 420. By making the extending direction of one end of the connection guide groove 420 of the first connection flow channel 600 and the second connection flow channel parallel to the extending direction of the guide groove 420, it is also possible to make the flow direction parallel to the extending direction of the guide groove 420 when the slurry leaves the first connection flow channel 600 and the second connection flow channel to enter the guide groove 420.

This application is through relative first feed inlet and the second feed inlet that sets up in the coating die head, realizes that thick liquids get into after the ejection of compact chamber 400 collide and then consume kinetic energy to reduce the impact force when thick liquids flow out from the coating die head, and then effectively improve the thick liquids of coating on the inhomogeneous condition of thickness of the length of discharge gate 410 (i.e. the size that L shows in FIG. 6). And in this application there is no limitation on the form of the structures comprising the exit chamber 400 that are included in the die.

Example 1

The present embodiment provides a coating die, as shown in fig. 1 to 6, consisting of an upper die 300, a lower die 100, and a gasket 200 sandwiched between the upper die 300 and the lower die 100. In the process of performing the coating process using the coating die provided in this embodiment, the upper die 300 is located above the lower die 100.

In this embodiment, the gasket 200 has a sheet-like structure with a notch 210, and two side surfaces of the gasket 200 are respectively attached to the upper die 300 and the lower die 100.

In this embodiment, a first surface of lower die 100 is configured to conform to shim 200. As shown in fig. 2, a first groove 110, a second groove 120, a first connection groove 130, and a second connection groove 140 are provided on the first surface. Wherein one end of the first connection groove 130 is connected with the first groove 110, and the other end of the first connection groove 130 is connected with the second groove 120; one end of the second connection groove 140 is connected with the other end of the first groove 110, and the other end of the second connection groove 140 is connected with the other end of the second groove 120. As shown in fig. 1, 2, 4, and 5, after gasket 200 is capped on lower die 100, gasket 200 and first groove 110 form feed cavity 500. Gasket 200 and first connecting slot 130 form an arc segment 610 of first connecting channel 600 (the left-hand shaded area in fig. 5 is the projection of first connecting channel 600 in a direction perpendicular to the first surface of lower die 100), and gasket 200 and second connecting slot 140 form an arc segment 610 of second connecting channel (the right-hand shaded area in fig. 5 is the projection of second connecting channel in a direction perpendicular to the first surface of lower die 100); the gasket 200 covers the two ends of the second groove 120 to form a straight line section 620 of the first connecting flow channel 600 and a straight line section 620 of the second connecting flow channel.

In this embodiment, as shown in fig. 5 and 6, the portion of the second connecting groove 140 inside the notch 210 that is not covered by the gasket 200 is the guiding groove 420 of the discharging cavity 400. In this example, as shown in fig. 1, 2 and 6, the surface of the upper die 300, the side surface of the gasket 200 surrounding the notch 210, the first surface of the lower die 100 and the groove wall of the second connecting groove 140 together form the discharge cavity 400 in the above embodiment (the hatched area in fig. 6 is the projection of the discharge cavity 400 in the direction perpendicular to the first surface of the lower die 100). Wherein, the first feeding port and the second feeding port are both surrounded by the wall of the second connecting slot 140 and the edge of the gasket 200, and the discharge port 410 is surrounded by the edge of the first surface of the lower die 100, the edge of the notch 210 and the surface of the upper die 300.

In this embodiment, the ratio of the length of the guiding groove 420 to the length of the second groove 120 is between 0.8 and 1 (including 0.8 and 1), for those skilled in the art, after the gasket 200 is covered when the ratio of the length of the guiding groove 420 to the length of the second groove 120 is 1, the groove wall of the second groove 120 completely forms the guiding groove 420, the length of the straight line segment 620 in the first connecting channel 600 and the second connecting channel is 0, and when the ratio of the length of the guiding groove 420 to the length of the second groove 120 is less than 1, the middle portion of the second groove 120 forms the guiding groove 420 of the discharging cavity 400 after the gasket 200 is covered, and the two end portions of the second groove 120 form the straight line segment 620 of the first connecting channel 600 and the straight line segment of the second connecting channel respectively.

Example 2

Based on the specific structure of the technical coating die disclosed in embodiment 1, the structure on the first surface of the lower die 100 in this embodiment forms a symmetrical structure, the symmetry axis being an axis perpendicular to the extending direction of the first groove 110. Accordingly, the first groove 110 and the second groove 120 are parallel to each other. The first connecting groove 130 and the second connecting groove 140 both extend along a C-shaped curve and connect the ends of the first groove 110 and the second groove 120, and in other embodiments, the first connecting groove 130 and the second connecting groove 140 may also extend along a U-shaped curve.

In the present embodiment, as shown in fig. 2 to 4, the inner edge of the notch 210 of the spacer 200 is located between the first connection groove 130 and the second connection groove 140. In other embodiments, the spacer 200 may also be located on two contour lines of the second connecting groove 140 parallel to the extending direction, so as to partially cover the second connecting groove 140.

Example 3

Based on the specific structure of the coating die of the technology disclosed in embodiment 1, in the coating die of this embodiment, as shown in fig. 1, the depth of the first groove 110 is greater than the depth of the second groove 120. In the process of coating, the slurry flows from the first groove 110 to the second groove 120 through the first connecting groove 130 and the second connecting groove 140 (i.e. flows from the feeding cavity 500 to the discharging cavity 400), and the slurry at the bottom of the first groove 110 moves upwards to convert part of kinetic energy of the slurry into gravitational potential energy, so that the impact force of the slurry in flowing out can be further reduced. In this embodiment, the depth of the first groove 110 is in the range of 10-20 mm, and the depth of the second groove 120 is in the range of 5-15 mm.

In this embodiment, the cross-sectional shapes of the first connecting groove 130 and the second connecting groove 140 are U-shaped or C-shaped and the depth is uniformly changed, wherein the cross-section is a cross-section perpendicular to the slurry flowing direction. Further, the bottom of the first groove 110 is provided with a through feed hole, through which feeding hole the slurry in the feed pipe into the first groove 110 is achieved.

In the above embodiment of the present application, a gasket 200 is provided between the upper die 300 and the lower die 100, and the gasket 200 participates in forming the discharge chamber 400. By adjusting the thickness of gasket 200, the thickness of outlet 410 may be adjusted, wherein outlet 410 has a thickness of the size indicated by T in fig. 1. In other embodiments, shim 200 may not be provided, and accordingly, an open ended slot structure may be provided in upper die 300 and/or lower die 100 to form discharge chamber 400.

In other embodiments, other structural components may be used to enclose the coating die with the discharge cavity 400 provided herein, and the coating die is not limited to the existing upper die 300, lower die 100, gasket 200, etc.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The coating die head is characterized by comprising a discharge cavity, wherein the discharge cavity is provided with a first feed inlet and a second feed inlet which are oppositely arranged, and the discharge cavity is also provided with a discharge outlet; the feeding direction of the discharging cavity and the discharging direction form an included angle; the slurry leaves the coating die head from the discharge port;

wherein the feeding direction is the direction when the slurry flows into the discharging cavity from the first feeding port and the second feeding port; the discharging direction is the direction when the slurry flows out from the discharging hole.

2. The coating die of claim 1, wherein the feed direction at the first feed port location is collinear and opposite to the feed direction at the second feed port location such that the slurry entering the discharge cavity from the first feed port and the second feed port can move in opposition along the same line.

3. The coating die of claim 2, wherein the discharge direction is perpendicular to the feed direction.

4. The coating die of claim 1, wherein the discharge cavity has a guide slot, the first feed opening is located at a first end of the guide slot, the second feed opening is located at a second end of the guide slot, and the guide slot is configured to move slurry entering the discharge cavity in an extension direction of the guide slot.

5. The coating die of claim 4, further comprising a feed cavity for communicating with a feed conduit, a first end of the feed cavity communicating with a first feed port of the discharge cavity through a first connecting flow channel, and a second end of the feed cavity communicating with a second feed port of the discharge cavity through a second connecting flow channel.

6. The coating die of claim 5, wherein the first connecting channel and the second connecting channel each comprise an arc segment and a straight segment that are connected to each other; the arc line section is used for changing the flowing direction of the slurry in the process of moving the slurry from the feeding cavity to the discharging cavity, the extending direction of the straight line section is parallel to the extending direction of the guide groove, and the straight line section is connected with the guide groove.

7. The coating die of claim 5, wherein die comprises an upper die, a lower die, and a shim between the upper die and the lower die, the shim being provided with a gap;

the first surface of the lower die head is provided with a first groove, a second groove, a first connecting groove and a second connecting groove; one end of the first connecting groove is connected with one end of the first groove, and the other end of the first connecting groove is connected with one end of the second groove; one end of the second connecting groove is connected with the other end of the first groove, and the other end of the second connecting groove is connected with the other end of the second groove;

the first side surface of the gasket is covered on the first surface of the lower die head to form the feeding cavity, the first connecting flow passage and the second connecting flow passage;

the gap of the gasket is positioned above the second groove; the upper die head, the gap of the gasket and the lower die head jointly enclose the discharging cavity; the second groove forms the guide groove.

8. The coating die of claim 7, wherein the second groove extends in a straight line, and both ends of the second groove are covered by the gasket to form a straight line segment at one end of the first connecting flow path and one end of the second connecting flow path.

9. The coating die of claim 7, wherein the depth of the first groove is greater than the depth of the second groove.

10. A coating apparatus comprising the coating die of any one of claims 1 to 9.