CN114643163A - Coating die head and coating device - Google Patents

Abstract

The present application discloses a coating die and a coating device. The coating die includes a die body, a slit for the flow of the coating slurry is arranged in the die body, and the slit has an outlet for the outflow of the coating slurry; the outlet of the slit is at The two inner walls opposite in the width direction are respectively provided with the same first chamfer and second chamfer.

Description

A coating die and coating device

technical field

The present application relates to the technical field of battery production equipment, and more particularly, to a coating die and a coating device.

Background technique

In recent years, with the development of science and technology and the promotion of new energy vehicles, the application of lithium-ion batteries has become more and more extensive. The pole piece is the key component of the lithium ion battery. In the production process of the pole piece, coating is one of the very important links. When the existing coating die is coating, the speed direction of the coating slurry changes greatly when it flows out, the flow field is not easy to stabilize, and it is easy to form a "dead zone" in the flow field, which causes the slurry to settle and block after agglomeration, thereby causing Defects such as coating lines.

In view of this, it is necessary to provide a new technical solution to solve the above technical problems.

SUMMARY OF THE INVENTION

An object of the present application is to provide a new technical solution for a coating die and a coating device.

According to a first aspect of the present application, a coating die head is provided, the coating die head comprising:

The die body is provided with a slit for the flow of the coating slurry, and the slit has an outlet for the outflow of the coating slurry; the outlet of the slit is at two opposite sides in the width direction. The inner walls are respectively provided with the same first chamfer and second chamfer.

Optionally, both the first chamfer and the second chamfer are rounded corners, and the radius of the rounded corner of the first chamfered corner is the same as the radius of the rounded corner of the second chamfered corner.

Optionally, the radius of the rounded corner of the first chamfer and the radius of the rounded corner of the second chamfer are both R, and 0.5mm≤R≤2.5mm.

Optionally, the die body includes a first module and a second module, the first module has a first surface, the second module has a second surface, and the slit is formed on the first surface and the second surface. between said second surfaces;

The first module has a third surface intersecting the first surface at the outlet, the second module has a fourth surface intersecting the second surface at the outlet, the third The surface is flush with the fourth surface; the first chamfer is formed between the first surface and the third surface; the second chamfer is formed between the second surface and the third surface between the four surfaces.

Optionally, the first surface is inclined relative to the third surface, the second surface is inclined relative to the fourth surface, and the first surface is parallel to the second surface.

Optionally, the inclination angle of the first surface relative to the third surface and the inclination angle of the second surface relative to the fourth surface are both Q, and 50°≤Q≤70°.

Optionally, the die head body further comprises a gasket, the gasket is sandwiched between the first module and the second module, the gasket has a fifth surface and a sixth surface arranged opposite to each other, The first surface is in contact with the fifth surface, the second surface is in contact with the sixth surface, the gasket is provided with a notch that is concave in the direction away from the outlet, the A recess penetrates the fifth surface and the sixth surface, and the first surface and the second surface respectively cover the recess to form the slit.

Optionally, the gasket further has a seventh surface connected between the fifth surface and the sixth surface, the seventh surface is respectively butted with the third surface and the fourth surface, and the The seventh surface is disposed flush with the third surface and the fourth surface.

Optionally, a third chamfer is provided between the seventh surface and the fifth surface, and the third chamfer is the same as the first chamfer; the seventh surface and the sixth surface A fourth chamfer is arranged therebetween, and the fourth chamfer is the same as the second chamfer.

According to a second aspect of the present application, there is provided a coating device comprising the coating die as described in the first aspect.

The technical solution adopted in this application can achieve the following beneficial effects:

In the coating die provided in the embodiment of the present application, by setting the same first chamfer and second chamfer on the two opposite inner walls at the exit of the slit, it can help to smoothly transition the coating slurry to the substrate It can reduce the residence time of the coating slurry at the outlet, significantly improve the flow "dead zone" of the coating slurry at the outlet, reduce the occurrence of agglomeration and sedimentation of the coating slurry, and reduce the large size of the agglomeration and sedimentation of the coating slurry. The risk of particles is reduced, and the probability of defects such as coating lines is reduced.

Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

1 is a schematic cross-sectional view of the overall structure of a coating die according to an embodiment of the present application;

Fig. 2 is the enlarged schematic diagram of A place in Fig. 1;

3 is a schematic diagram of an exploded structure of a coating die according to an embodiment of the present application;

4 is a schematic structural diagram of a gasket in a coating die according to an embodiment of the present application;

FIG. 5 is an enlarged schematic view of B in FIG. 4 .

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

1-2, according to an embodiment of the present application, a coating die is provided. The coating die includes a die body, and the die body is provided with a slit 101 for the flow of the coating slurry, and the slit 101 has an outlet 1011 for the outflow of the coating slurry; the slit The two inner walls of the outlet 1011 of the outlet 101 opposite to each other in the width direction are respectively provided with the same first chamfer 132 and the second chamfer 332 .

In the coating die provided in the embodiment of the present application, the coating slurry flows in the slit 101 and flows out through the outlet 1011 and is then sprayed on the substrate 4 . In this process, since the two inner walls of the outlet 1011 of the slit 101 opposite in the width direction are respectively provided with the first chamfer 132 and the second chamfer 332, and the first chamfer 132 and the second chamfer 332 are the same, In this way, the first chamfer 132 and the second chamfer 332 can help to smoothly transfer the coating slurry to the substrate 4 , reduce the residence time of the coating slurry at the outlet 1011 , and significantly improve the coating slurry at the outlet 1011 It can reduce the occurrence of agglomeration and sedimentation of the coating slurry, reduce the risk of agglomeration and sedimentation of the coating slurry to form large particles, and reduce the probability of defects such as coating lines. Wherein, the width direction is the direction a shown in FIG. 2 .

In one embodiment, further, the first chamfer 132 and the second chamfer 332 are both rounded corners, and the radius of the rounded corner of the first chamfer 132 is the same as the second chamfer 332 The radius of the rounds is the same.

In this specific example, setting the first chamfer 132 and the second chamfer 332 to be chamfers of the same shape, for example, the setting of the first chamfer 132 and the second chamfer 332 is not only more effective It is beneficial to help the coating slurry to smoothly transition to the substrate 4, and the processing technology is simple and easy to manufacture. Further, the dimensions of the first chamfer 132 and the second chamfer 332 are kept the same. For example, when the first chamfer 132 and the second chamfer 332 are both rounded, the radius of the first chamfer 132 is the same as that of the first chamfer 132 . The radii of the two chamfers 332 are both R, and R is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. In other embodiments, both the first chamfer 132 and the second chamfer 332 can be set to the same chamfer angle, and the chamfer can also play a role in helping the coating slurry to smoothly transition to the substrate 4 effect.

Referring to FIG. 3 , in one embodiment, the die body includes a first module 1 and a second module 3 , the first module 1 has a first surface 11 , and the second module 3 has a second surface 31, the slit 101 is formed between the first surface 11 and the second surface 31; further, as shown in FIG. 1 and FIG. 2, the first module 1 has an outlet at the outlet 1011 The third surface 131 intersecting the first surface 11, the second module 3 has a fourth surface 331 intersecting the second surface 31 at the outlet 1011, the third surface 131 and the The fourth surface 331 is flush; the first chamfer 132 is formed between the first surface 11 and the third surface 131 ; the second chamfer 332 is formed between the second surface 31 and the third surface 131 . between the fourth surface 331 .

In this specific example, the die head body specifically includes a two-part structure, that is, a first module 1 and a second module 3, the first module 1 and the second module 3 are disposed opposite to each other, and a slit 101 is formed therebetween. In this way, the die body is easy to manufacture and install, and the formation of the slit 101 is simple. More specifically, a slit 101 is formed between the first surface 11 of the first module 1 and the second surface 31 of the second module 3, that is, the inner wall of the slit 101 includes the first surface 11 and the second surface 31, and the above-mentioned surfaces are used. The arrangement opposite to the surface is not only convenient for installation, but also the formation of the slit 101 is simpler, and it is easier to control the size of the slit 101 . Specifically, the first module 1 is provided with a first die lip 13 protruding at the outlet, the third surface 131 is the surface of the first die lip 13 facing the substrate 4, and the third surface 131 is connected with the first surface 11; The second module 3 is protruded with a second die lip 33 at the outlet, the fourth surface 331 is the surface of the second die lip 33 facing the substrate 4 , and the fourth surface 331 is connected with the second surface 31 . The third surface 131 and the fourth surface 331 are located on the same plane and the plane is parallel to the direction of the substrate 4 . This arrangement ensures that the distances between the first die lip 13 and the second die lip 33 and the substrate 4 are always consistent, which is beneficial to Stability of the coating process. Further, the thickness of the first die lip 13 is in the range of 1.5mm to 5mm, and the thickness of the second die lip 33 is in the range of 4.5mm to 15mm. The die lip 13 is easily deformed, so that the width of the outlet of the slit 101 can be easily adjusted, thereby adjusting the spraying amount of the local area. More specifically, a first chamfer 132 is provided between the first surface 11 and the third surface 131 , and a second chamfer 332 is provided between the second surface 31 and the fourth surface 331 . The first chamfer 132 and the second chamfer 332 can help to smoothly transition the coating slurry to the substrate 4, reduce the residence time of the coating slurry at the outlet end, and significantly improve the flow "dead" of the coating slurry at the outlet end. Zone", reduce the occurrence of agglomeration and sedimentation of the coating slurry, reduce the risk of agglomeration and sedimentation of the coating slurry to form large particles, and reduce the probability of defects such as coating lines.

Referring to FIG. 1 and FIG. 3 , further, a material storage cavity is provided in the die body, and the material storage cavity is communicated with the inlet of the slit 101 . In a specific example, a first material storage cavity 12 is opened in the first module 1, and the cross section of the first material storage cavity 12 can be circular or oval; a second material storage cavity is opened in the second module 3 The cross section of the cavity 32 and the second material storage cavity 32 can also be circular or oval. The first material storage cavity 12 and the second material storage cavity 32 are butted together to form a material storage space inside the die body. Further, the second module 3 is also provided with a feed channel 34 , and the feed channel 34 and the second material storage cavity 32 communicate with each other. During the coating process of the pole piece, the coating slurry enters the storage space (the first storage cavity 12 and the second storage cavity 32 ) inside the die body through the feeding channel 34 , and then passes through the slit 101 Spray on the substrate 4. In addition, in addition to the embodiments shown in FIG. 1 and FIG. 3 , a chamber may be provided only in the first module 1 or the second module 3 , and the chamber is a material storage chamber.

1-2 , in one embodiment, further, the first surface 11 is inclined relative to the third surface 131 , the second surface 31 is inclined relative to the fourth surface 331 , The first surface 11 is parallel to the second surface 31 .

In this specific example, the flow direction of the coating slurry in the slit 101 presents an inclined angle rather than a vertical angle with respect to the direction of the substrate 4, which makes the coating slurry flow out through the slit 101, The flow of the coating slurry has a velocity component that is consistent with the direction of the substrate 4 , thereby facilitating the smooth coating of the coating slurry on the substrate 4 . Referring to FIGS. 1-3 , further specifically, the first surface 11 and the second surface 31 are parallel to each other. The arrangement of the first surface 11 and the second surface 31 parallel to each other makes the size of the slits 101 uniform, which is beneficial to the smooth flow of the coating slurry.

In one embodiment, further, the angle of inclination of the first surface 11 relative to the third surface 131 and the inclination angle of the second surface 31 relative to the fourth surface 331 are both Q, and 50°≤ Q≤70°.

The inclination angle within the above-mentioned size range is more beneficial to ensure the smooth coating of the coating slurry on the substrate 4 .

Referring to FIG. 3 , in one embodiment, the die body further includes a gasket 2 sandwiched between the first module 1 and the second module 3 , the The gasket 2 has a fifth surface 21 and a sixth surface 22 arranged opposite to each other, the first surface 11 is in contact with the fifth surface 21 , and the second surface 31 is in contact with the sixth surface 22 In combination, the gasket 2 is provided with a notch that is recessed in the direction away from the outlet, and the notch penetrates the fifth surface 21 and the sixth surface 22, the first surface 11 and the first surface 11 and the first surface 11. The two surfaces 31 cover the notches respectively to form the slits 101 .

In this specific example, the die body further includes a gasket 2 sandwiched between the first module 1 and the second module 3 . Both the first module 1 and the second module 3 are partially connected to the gasket 2 , and the area where the first module 1 and the second module 3 overlap with the notch of the gasket 2 forms a slit 101 . In this way, the formation of the slit 101 is simple, and it is convenient to control the size of the slit 101 . In addition, the area other than the slit 101 between the first module 1 and the second module 3 is sealed by the gasket 2, so as to avoid leakage of the coating slurry at the place where the material does not need to be discharged. More specifically, the first surface 11 of the first module 1 is attached to the fifth surface 21 of the gasket 2, the second surface 31 of the second module 3 is attached to the sixth surface 22 of the gasket 2, and the first module 1 and the second module 3 are tightly connected with the gasket 2 .

Referring to FIG. 4 and FIG. 5 , in one embodiment, further, the gasket 2 further has a seventh surface 23 connected between the fifth surface 21 and the sixth surface 22 , the seventh surface 23 . The surfaces 23 are respectively butted with the third surface 131 and the fourth surface 331 , and the seventh surface 23 is flush with the third surface 131 and the fourth surface 331 .

In this specific example, on both sides of the die body, the seventh surface 23 abuts the third surface 131 and the fourth surface 331 respectively and is in the same plane, so that the seventh surface 23 meets the two sides of the die body at the exit. The sides are closed, and this setting can prevent the coating slurry from leaking from both sides of the die body during the coating process.

Referring to FIGS. 4 and 5 , in one embodiment, further, a third chamfer 24 is provided between the seventh surface 23 and the fifth surface 21 , and the third chamfer 24 is connected to the The first chamfer 132 is the same; a fourth chamfer 25 is provided between the seventh surface 23 and the sixth surface 22 , and the fourth chamfer 25 is the same as the second chamfer 332 .

Specifically, the shape and size of the third chamfer 24 and the first chamfer 132 are consistent and completely coupled, and the shape and size of the fourth chamfer 25 and the second chamfer 332 are consistent and completely coupled. Such an arrangement can make the die head The two sides of the body are tightly closed, which further prevents the coating slurry from leaking out from the two sides of the die body during the coating process.

Referring to FIG. 3 and FIG. 4 , in one embodiment, the gasket 2 further includes a main body part 201 and two extension parts 202 connected to the main body part 201 , and the two extension parts 202 are arranged at intervals on the The same side of the main body part 201; the fifth surface 21 and the sixth surface 22 both extend from the main body part 201 to the extension part 202; the area between the two extension parts 202 is the above-mentioned gasket 2 notch 203.

In this specific example, the gasket 2 is a structure similar to a "C-type". The slits 101 are formed by the recesses 203 between the extending parts 202 and the regions corresponding to the first surface 11 and the second surface 31 . Optionally, the main body portion 201 and the two extending portions 202 of the gasket 2 are integrally formed, and the gasket 2 is formed in a simple manner and is easy to manufacture.

According to another embodiment of the present application, there is provided a coating device including the coating die as described above. The coating device is used in the production process of the pole piece of the lithium battery.

The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Repeat.

Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims (10)

1. a coating die, is characterized in that, comprises: A die body, a slit (101) for the flow of the coating slurry is provided in the die body, and the slit (101) has an outlet (1011) for the outflow of the coating slurry; the slit The two inner walls of the outlet (1011) of the (101) opposite in the width direction are respectively provided with the same first chamfer (132) and the second chamfer (332). 2. The coating die head according to claim 1, wherein the first chamfer (132) and the second chamfer (332) are both rounded, and the first chamfer (132) ) has the same radius as that of the second chamfer (332). 3. The coating die head according to claim 2, wherein the radius of the rounded corner of the first chamfer (132) and the radius of the rounded corner of the second chamfer (332) are the same is R, and 0.5mm≤R≤2.5mm. 4. The coating die according to claim 1, wherein the die body comprises a first module (1) and a second module (3), the first module (1) having a first surface (11), the second module (3) has a second surface (31), and the slit (101) is formed between the first surface (11) and the second surface (31); The first module (1) has a third surface (131) that intersects the first surface (11) at the outlet, and the second module (3) has a third surface (131) that intersects the first surface (11) at the outlet. The fourth surface (331) where the two surfaces (31) intersect, the third surface (131) is flush with the fourth surface (331); the first chamfer (132) is formed on the first chamfer (132) between the surface (11) and the third surface (131); the second chamfer (332) is formed between the second surface (31) and the fourth surface (331). 5. The coating die head according to claim 4, wherein the first surface (11) is inclined relative to the third surface (131), and the second surface (31) is relative to the third surface (131) Four surfaces (331) are arranged obliquely, and the first surface (11) is parallel to the second surface (31). 6. The coating die head according to claim 4, characterized in that the angle at which the first surface (11) is inclined relative to the third surface (131) and the second surface (31) is relative to the third surface (131) The angles at which the fourth surface (331) is inclined are all Q, and 50°≤Q≤70°. 7. The coating die head according to claim 4, characterized in that, the die head body further comprises a gasket (2), and the gasket (2) is sandwiched between the first module (1) and the Between the second modules (3), the gasket (2) has a fifth surface (21) and a sixth surface (22) opposite to each other, the first surface (11) and the fifth surface ( 21) fit, the second surface (31) and the sixth surface (22) fit, the gasket (2) is provided with a notch that is recessed in the direction away from the outlet, the A recess penetrates the fifth surface (21) and the sixth surface (22), and the first surface (11) and the second surface (31) respectively cover the recess to form the slit (101). 8. The coating die head according to claim 7, wherein the gasket (2) further has a seventh surface connected between the fifth surface (21) and the sixth surface (22) (23), the seventh surface (23) is respectively butted with the third surface (131) and the fourth surface (331), and the seventh surface (23) is connected to the third surface (131) ) and the fourth surface (331) are flush. 9 . The coating die head according to claim 8 , wherein a third chamfer ( 24 ) is provided between the seventh surface ( 23 ) and the fifth surface ( 21 ), and the first The three chamfers (24) are the same as the first chamfers (132); a fourth chamfer (25) is provided between the seventh surface (23) and the sixth surface (22), and the third chamfer (25) is The four chamfers (25) are the same as the second chamfers (332). 10. A coating device, characterized in that, the coating device comprises the coating die head according to any one of claims 1-9.

Images