CN219168796U

CN219168796U - Extrusion coating gasket and coating device

Info

Publication number: CN219168796U
Application number: CN202320171191.2U
Authority: CN
Inventors: 艾凯明; 安柏楠; 吴自亮; 谭友斌
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-01-29
Filing date: 2023-01-29
Publication date: 2023-06-13
Anticipated expiration: 2033-01-29

Abstract

The utility model discloses an extrusion coating gasket and a coating device, wherein the extrusion coating gasket comprises: the gasket comprises a gasket body, wherein a gap is formed in one side of the gasket body in the width direction, and first clamping parts are formed in two sides of the gap; gasket sub-body, the gasket sub-body is at least one, at least one the gasket sub-body set up in at least one side of breach, the gasket sub-body includes: the second clamping part and the extension part are mutually connected in the length direction, and the second clamping part is matched with the first clamping part in a clamping way; wherein the lengths of the extensions of the shim body are different. Wherein, the gasket body is in the same place through first joint portion and second joint portion connection with the gasket body, and the extension length of gasket body is changeable, through the gasket body that uses different sizes, adapts to the coating of different width, practices thrift material cost and time cost.

Description

Extrusion coating gasket and coating device

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to an extrusion coating gasket and a coating device.

Background

The manufacturing process of the battery core of the lithium battery comprises the steps of proportioning pulping, coating, rolling, slitting, assembling, welding, packaging, liquid injection, formation and the like, wherein the coating process is a process of uniformly coating the suspension on the pole piece, wetting, leveling and drying. The coating process can be divided into three types of slope coating, extrusion coating and curtain coating, and in the lithium battery production process, the strip seam extrusion coating has the most extensive application, and has the advantages of quantification, high speed, stability and the like. The coating system includes a mechanical structural component and an electrical control system. Wherein the extrusion coated primary mechanical parts comprise: unreeling device, coating device, area density detection device, oven, deviation correcting device and coiling mechanism. The coating device consists of a slurry storage tank, a die head and a gasket. Slurry flows out of the storage tank through the inner cavity of the die head and the gap formed by the die head and the gasket, and is smeared on the moving pole piece.

In the related art, the width of the spacer is fixed and not adjustable. If the product requires batteries of different sizes, the coating width of the pole piece needs to be correspondingly adjusted, and gaskets of different widths need to be replaced in the coating engineering, which increases the process materials and the management cost.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the extrusion coating gasket, the gasket body and the gasket body are connected together through the first clamping part and the second clamping part, the length of the extension part of the gasket body is variable, and the gasket bodies with different sizes are used for adapting to coating with different widths, so that the material cost and the time cost are saved.

The utility model also provides a coating device.

An extrusion coated gasket according to an embodiment of the first aspect of the present utility model comprises: the gasket comprises a gasket body, wherein a notch is formed in one side of the gasket body in the width direction, and at least one side of the notch is provided with a first clamping part; gasket sub-body, the gasket sub-body is at least one, at least one the gasket sub-body set up in at least one side of breach, the gasket sub-body includes: the second clamping part and the extension part are mutually connected in the length direction, and the second clamping part is matched with the first clamping part in a clamping way; wherein the lengths of the extensions of the shim body are different.

According to the extrusion coating gasket provided by the embodiment of the utility model, the gasket body and the gasket body are connected together through the first clamping part and the second clamping part, the length of the extending part of the gasket body is variable, and the gasket bodies with different sizes are used for adapting to coating with different widths, so that the material cost and the time cost are saved.

According to some embodiments of the utility model, the first clamping portion is one of a clamping protrusion and a clamping groove, and the second clamping portion is the other of the clamping protrusion and the clamping groove, and the clamping protrusion and the clamping groove are in clamping fit.

According to some embodiments of the utility model, the first clamping portion and the second clamping portion are respectively provided with a clamping protrusion and a clamping groove, the clamping protrusions on the first clamping portion are matched with the clamping grooves on the second clamping portion in a clamping manner, and the clamping grooves on the first clamping portion are matched with the clamping protrusions on the second clamping portion in a clamping manner.

According to some embodiments of the utility model, the dimension of the gasket body in the width direction is h1, and the dimension of the snap-protrusion from one side of the gasket body to the other side of the gasket body is h2, and h1 and h2 satisfy the relation: h2/h1 is more than or equal to 0.5 and less than or equal to 0.75.

According to some embodiments of the utility model, the first clamping portions and the second clamping portions are at least two, and the at least two first clamping portions and the at least two second clamping portions are in one-to-one corresponding clamping connection.

According to some embodiments of the utility model, the gasket body is provided with a first chamfer facing the gasket body in the width direction and a second chamfer facing away from the gasket body in the width direction on a side of the gap.

According to some embodiments of the utility model, the radius of the first chamfer is r1, r1 satisfying the relation: r1 is more than or equal to 4mm and less than or equal to 6mm; and, the radius of the second chamfer is r2, and r2 satisfies the relation: r2 is more than or equal to 1mm and less than or equal to 3mm.

According to some embodiments of the utility model, a side of the gasket body facing the notch is provided with a skived zone, the skived zone having a smaller dimension in the width direction than the gasket body.

According to some embodiments of the utility model, the skived zone has a dimension h3 in the length direction, h3 satisfying the relation: h3 is more than or equal to 0.5mm and less than or equal to 1mm; and a third chamfer is arranged on one side of the skiving area, which faces the gasket body in the width direction, and the radius of the third chamfer is r3, and r3 meets the relation: r3 is more than or equal to 0.3mm and less than or equal to 0.6mm.

According to some embodiments of the utility model, a distance between the first clamping portion and an edge of the gasket body is l3 in a length direction, a length of the extension portion is l4, and the l3 and the l4 satisfy a relation: l3 > l4.

According to some embodiments of the utility model, the l4 satisfies the relation: l4 is more than or equal to 10mm and less than or equal to 400mm.

The coating apparatus according to the embodiment of the second aspect of the present utility model includes: a first mold; the second die is arranged below the first die; the extrusion coating gasket is clamped between the first die and the second die.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a first direction of an extrusion coated gasket according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a second orientation of an extrusion coated gasket according to an embodiment of the present utility model;

FIG. 3 is an exploded view of an extrusion coated gasket according to an embodiment of the present utility model;

FIG. 4 is a schematic structural view of a gasket body according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a first direction of a shim body according to a first embodiment of the present utility model;

FIG. 6 is a schematic view of a second orientation of a shim body according to a first embodiment of the present utility model;

fig. 7 is a schematic structural view of a gasket body according to a second embodiment of the present utility model.

Reference numerals:

100. extruding and coating a gasket;

10. a gasket body; 11. a first clamping part; 12. a mounting hole; 13. a notch;

20. a spacer body; 21. a second clamping part; 22. an extension; 23. a first chamfer; 24. a second chamfer; 25. a skiving area; 251. and (3) third chamfering.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

The following describes an extrusion coated gasket 100 according to an embodiment of the present utility model with reference to fig. 1 to 7, and the present utility model also proposes a coating apparatus having the extrusion coated gasket 100 described above.

The coating process is one of important links in the lithium battery production process, and the stability and uniformity of the coating process play an important role in the smooth development of the subsequent process.

As shown in connection with fig. 1-4, the extrusion coated gasket 100 includes: the gasket comprises a gasket body 10 and a gasket body 20, wherein a gap 13 is formed in one side of the gasket body 10 in the width direction, and a first clamping part 11 is formed in at least one side of the gap 13. Specifically, the gasket body 10 is provided with a plurality of mounting holes 12, the gasket body 10 is fixed on the coating device by the fastener penetrating through the mounting holes 12, the gasket body 10 cannot move relatively, and the gasket body 10 is prevented from deviating from the original position. The gasket body 10 is provided with breach 13 in one side of width direction, and the coating is located breach 13 department, and breach 13 is provided with first joint portion 11 in at least one side of length direction, and first joint portion 11 and gasket body 20 joint each other, link together gasket body 10 and gasket body 20, form a whole.

And, the gasket body 20 is at least one, and at least one gasket body 20 sets up in the at least one side of breach 13, and gasket body 20 includes: the second clamping part 21 and the extension part 22 are mutually connected in the length direction, and the second clamping part 21 and the first clamping part 11 are matched in a clamping way; wherein the lengths of the extensions 22 of different shim bodies 20 are different. Specifically, the gasket body 20 and the gasket body 10 interconnect, the gasket body 20 can be two, and two gasket bodies 20 are located the both sides of breach 13 respectively, and gasket body 20 includes second joint portion 21 and extension 22, and second joint portion 21 cooperatees with first joint portion 11, and the joint each other links together gasket body 20 and gasket body 10, guarantees the stability of the width and the direction of export ground paste, and extension 22 is spacing the coating, prevents the coating skew. The extension 22 of the different gasket body 20 is different in length, can adapt to the coating of different width through changing the gasket body 20, save material cost, change the coating width fast, save time.

From this, gasket body 20 and gasket body 10 link together through first joint portion 11 and second joint portion 21, and the extension 22 length of gasket body 20 is changeable, through the use not unidimensional gasket body 20, adapts to the coating of different width, practices thrift material cost and time cost.

The first clamping portion 11 is one of a clamping protrusion and a clamping groove, and the second clamping portion 21 is the other of the clamping protrusion and the clamping groove, and the clamping protrusion and the clamping groove are in clamping fit. Specifically, if the first clamping portion 11 is a clamping protrusion, the second clamping portion 21 is a clamping groove, and the clamping protrusion and the clamping groove are mutually clamped and matched to connect the gasket body 10 and the gasket body 20 together, so as to ensure the connection strength of the gasket body 10 and the gasket body 20; if the first clamping portion 11 is a clamping groove, the second clamping portion 21 is a clamping protrusion, the clamping groove and the clamping protrusion are matched in a clamping manner, the gasket body 10 and the gasket body 20 are fixedly connected, the connection strength of the gasket body 10 and the gasket body 20 is ensured, and the integrity and the reliability of the gasket body 10 and the gasket body 20 are improved.

Referring to fig. 1 and 2, the first clamping portion 11 and the second clamping portion 21 are respectively provided with a clamping protrusion and a clamping groove, the clamping protrusion on the first clamping portion 11 is matched with the clamping groove on the second clamping portion 21 in a clamping manner, and the clamping groove on the first clamping portion 11 is matched with the clamping protrusion on the second clamping portion 21 in a clamping manner. Specifically, the first clamping portion 11 is provided with a clamping protrusion and a clamping groove, the second clamping portion 21 is provided with a clamping protrusion and a clamping groove, the clamping protrusion on the first clamping portion 11 is matched with the clamping groove on the second clamping portion 21 in a mutually clamping manner, the clamping groove on the first clamping portion 11 is matched with the clamping protrusion on the second clamping portion 21 in a mutually clamping manner, the connection strength of the gasket body 10 and the gasket body 20 is improved, and the integrity of the extrusion coating gasket 100 is guaranteed.

As shown in fig. 5, the dimension of the gasket body 20 in the width direction is h1, the dimension between one side of the snap projection toward the gasket body 10 and the other side of the gasket body is h2, and h1 and h2 satisfy the relation: h2/h1 is more than or equal to 0.5 and less than or equal to 0.75. Specifically, in the width direction, the size of the gasket body 20 is h1, the size of the clamping protrusion from one side of the gasket body 10 to the other side of the gasket body 20 is h2, and the ratio of the size of the clamping protrusion from one side of the gasket body 10 to the other side of the gasket body 20 to the size of the gasket body 20 in the width direction is between 0.5 and 0.75, so that the clamping protrusion has a sufficient depth, and the connection strength between the clamping protrusion and the clamping groove is higher when the clamping protrusion is clamped with the clamping groove. If the ratio of the dimension of the clamping protrusion in the width direction to the dimension of the gasket body 20 is smaller than 0.5, the depth of the clamping protrusion is too low to ensure the connection strength of the clamping protrusion and the clamping groove, so that the connection between the gasket body 10 and the gasket body 20 is weak; if the ratio of the dimension of the clip protrusion in the width direction to the dimension of the gasket body 20 is greater than 0.75, the depth of the clip protrusion is too high, so that the connection between the clip protrusion and the gasket body 20 is weak, and the clip protrusion is easy to break.

Further, the dimension of the card protrusion on the first clamping portion 11 in the length direction is l1, the dimension of the card slot on the first clamping portion 11 in the length direction is l2, and the l1 and l2 satisfy the relation: l1=l2, or l1+.l2. That is, the dimension of the engaging protrusion on the first engaging portion 11 may be equal to or unequal to the dimension of the engaging groove in the longitudinal direction. There is no limitation in this regard.

Further, as shown in fig. 7, the first clamping portions 11 and the second clamping portions 21 are at least two, and the at least two first clamping portions 11 and the at least two second clamping portions 21 are clamped in a one-to-one correspondence manner. Specifically, the number of the first clamping parts 11 is at least two, the number of the second clamping parts 21 is at least two, the first clamping parts 11 and the second clamping parts 21 are in one-to-one correspondence, the at least two first clamping parts 11 are matched with the at least two second clamping parts 21 in a clamping manner, the gasket body 10 and the gasket body 20 are connected, the connection strength of the gasket body 10 and the gasket body 20 is guaranteed, and the integrity of the extrusion coating gasket 100 is improved.

According to fig. 5 and 6, the gasket body 20 is directed to one side of the notch 13, and the gasket body 20 is provided with a first chamfer 23 and a second chamfer 24 in the width direction, the first chamfer 23 being directed to the gasket body 10 in the width direction, the second chamfer 24 being directed away from the gasket body 10 in the width direction. Specifically, be provided with first chamfer 23 and second chamfer 24 on the gasket body 20, first chamfer 23 and second chamfer 24 are located the gasket body 20 towards one side of breach 13, and first chamfer 23 and second chamfer 24 are located the both sides of width direction respectively, and first chamfer 23 is towards gasket body 10 in the width direction, and second chamfer 24 deviates from gasket body 10 in the width direction, and first chamfer 23 and second chamfer 24 make the slurry flow time more convenient smooth and easy, smear the slurry for the pole piece fast, raise the efficiency.

As shown in fig. 4, the radius of the first chamfer 23 is r1, and r1 satisfies the relation: r1 is more than or equal to 4mm and less than or equal to 6mm; and, the radius of the second chamfer 24 is r2, r2 satisfying the relationship: r2 is more than or equal to 1mm and less than or equal to 3mm. That is, the radius of the first chamfer 23 ranges from 4mm to 6mm, so that the slurry flows more smoothly; the radius of the second chamfer 24 ranges from 1mm to 3mm, and the radius of the second chamfer 24 is smaller than that of the first chamfer 23, so that slurry can flow conveniently and simultaneously is prevented from flowing out of the extrusion coating gasket 100, and waste is caused to the slurry.

As shown in fig. 5 and 6, the side of the gasket body 20 facing the notch 13 is provided with a skived region 25, and the dimension of the skived region 25 in the width direction is smaller than the dimension of the gasket body 20 in the width direction. Specifically, the thinned area 25 is arranged on the gasket body 20, the thinned area 25 is located on one side of the gasket body 20 facing the notch 13, the size of the thinned area 25 is smaller than that of the gasket body 20 in the width direction, the thickness of the thinned area 25 is smaller than that of other parts of the gasket body 20, when slurry flows, the slurry flows along the thinned area 25 to be coated, the thick edge phenomenon of the slurry edge can be avoided, the thickness of the slurry coated is consistent, and the manufacturing is fine.

Further, the dimension of the thinned region 25 in the length direction is h3, and h3 satisfies the relation: h3 is more than or equal to 0.5mm and less than or equal to 1mm; specifically, in the length direction, the size of the thinned area 25 is between 0.5mm and 1mm, so that slurry can flow to the coating along the thinned area 25 when flowing, the thick edge phenomenon of the slurry edge can be avoided, and the thickness of the slurry on the coating is consistent. If the dimension of the thinned region 25 in the length direction is smaller than 0.5mm, the dimension of the thinned region 25 in the length direction is too small to guide the flow of slurry; if the dimension of the thinned region 25 in the longitudinal direction is greater than 1mm, the dimension of the thinned region 25 in the longitudinal direction is too large, and too much slurry flows in the thinned region 25, the phenomenon of thick edges of the slurry is also caused.

And, the skived region 25 is provided with a third chamfer 251 on a side facing the gasket body 10 in the width direction, the radius of the third chamfer 251 is r3, and r3 satisfies the relation: r3 is more than or equal to 0.3mm and less than or equal to 0.6mm. Specifically, the third chamfer 251 is disposed on the skiving area 25, the third chamfer 251 is located on one side of the skiving area 25 facing the gasket body 10 in the width direction, and the radius range of the third chamfer 251 is between 0.3mm and 0.6mm, so that the slurry can flow conveniently. If the radius of the third chamfer 251 is smaller than 0.3mm, the radius of the third chamfer 251 is too small to guide the flow of slurry; if the radius of the third chamfer 251 is greater than 0.6mm, the dimension of the third chamfer 251 in the length direction is excessively large, which is not beneficial to the process molding of the skiving area 25.

As shown in fig. 3, in the length direction, the distance between the first engaging portion 11 and the edge of the gasket body 10 is l3, the length of the extension portion 22 is l4, and l3 and l4 satisfy the relation: l3 > l4. Specifically, the distance between the first clamping portion 11 and the edge of the gasket body 10 is greater than the length of the extension portion 22 in the length direction, ensuring the integrity of the extrusion coated gasket 100. If the extension portion 22 is too long, after the gasket body 10 and the gasket body 20 are connected, the connection strength of the first clamping portion 11 and the second clamping portion 21 is insufficient, which finally results in the separation of the gasket body 10 and the gasket body 20, and the reliability of the extrusion coating gasket 100 is insufficient.

Further, l4 satisfies the relation: l4 is more than or equal to 10mm and less than or equal to 400mm. That is, the length of the extension portion 22 ranges from 10mm to 400mm, and according to practical use requirements, the length of the extension portion 22 can be designed to be in the range, and the extension portion 22 is adapted to different sizes of coating, and limits the coating, so as to prevent coating deviation. The gasket body 20 with different lengths can be replaced to adapt to the coating with different widths, so that the material cost is saved, the coating width is quickly changed, and the time is saved.

The coating apparatus according to the embodiment of the second aspect of the present utility model includes: the extrusion coating gasket 100 comprises a first die, a second die and an extrusion coating gasket 100, wherein the second die is arranged below the first die, and the extrusion coating gasket 100 is clamped between the first die and the second die.

When the extrusion coating gasket 100 is installed, firstly, an outlet valve and a reflux valve of a conveying pipe are closed, the conveying pipe is unloaded, a first die is lifted and taken down, the first die is slowly and lightly placed on a foam backing plate to prevent knocks, the gasket body 10 is installed, then the gasket body 20 is installed according to the direction from bottom to top, the first clamping part 11 of the gasket body 10 and the second clamping part 21 of the gasket body 20 are ensured to be fully matched, and the gasket body 20 and the gasket body 10 are prevented from relative movement in the coating process, so that the coating width and the coating direction are influenced; secondly, moving the assembled gasket body 10 to ensure that the mounting hole 12 of the gasket body 10 is overlapped with the bolt hole of the second die; then, installing a first die, and installing an exhaust ball valve, a material conveying inlet valve and a reflux valve; finally, the left, right, front and rear positions of the first die and the second die are adjusted to proper positions, and an inlet valve of the conveying pipe is opened to carry out debugging parameters, wherein the debugging parameters comprise a conveying pump pressure, a distance from a coating die head to a pole piece, a conveying speed of the pole piece and the like. After the debugging parameters meet the process requirements, the setting is completed, and the continuous or intermittent coating process can be performed.

When the gasket body 20 needs to be replaced, closing an outlet valve of the conveying pipe, unloading the conveying valve and the return valve, lifting and taking down the first die, and slowly and lightly placing the first die on the foam backing plate; then, unloading the gasket body 20 from top to bottom, and installing a new gasket body 20 according to the coating width requirement, wherein the installation direction is from bottom to top; finally, the first mold, the exhaust ball valve and the material conveying inlet and outlet valve are installed, and the process flow of replacing the gasket body 20 is completed.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An extrusion coated gasket (100) comprising:

the gasket comprises a gasket body (10), wherein a plurality of mounting holes (12) are formed in the gasket body (10), a notch (13) is formed in one side of the gasket body (10) in the width direction, and a first clamping part (11) is formed in at least one side of the notch (13);

gasket sub-body (20), gasket sub-body (20) are at least one, at least one gasket sub-body (20) set up in at least one side of breach (13), gasket sub-body (20) include: the second clamping part (21) and the extension part (22), the second clamping part (21) and the extension part (22) are mutually connected in the length direction, and the second clamping part (21) is matched with the first clamping part (11) in a clamping mode.

2. The extrusion-coated gasket (100) of claim 1, wherein the first clamping portion (11) is one of a clamping protrusion and a clamping groove, and the second clamping portion (21) is the other of a clamping protrusion and a clamping groove, the clamping protrusion and the clamping groove being in clamping engagement.

3. The extrusion-coated gasket (100) of claim 1, wherein the first clamping portion (11) and the second clamping portion (21) are provided with a clamping protrusion and a clamping groove, the clamping protrusion on the first clamping portion (11) and the clamping groove on the second clamping portion (21) are in clamping fit, and the clamping groove on the first clamping portion (11) and the clamping protrusion on the second clamping portion (21) are in clamping fit.

4. The extrusion-coated gasket (100) of claim 3, wherein the gasket body (20) has a dimension h1 in the width direction, the dimension between one side of the snap-in toward the gasket body (10) and the other side of the gasket body (20) is h2, and h1 and h2 satisfy the relationship: h2/h1 is more than or equal to 0.5 and less than or equal to 0.75.

5. The extrusion-coated gasket (100) of claim 1, wherein the first clamping portions (11) and the second clamping portions (21) are at least two, and the at least two first clamping portions (11) and the at least two second clamping portions (21) are clamped in one-to-one correspondence.

6. The extrusion-coated gasket (100) of claim 1, wherein the gasket body (20) faces one side of the gap (13) and is provided with a first chamfer (23) and a second chamfer (24) in the width direction, the first chamfer (23) facing the gasket body (10) in the width direction, the second chamfer (24) facing away from the gasket body (10) in the width direction.

7. The extrusion-coated gasket (100) of claim 6, wherein the first chamfer (23) has a radius r1, r1 satisfying the relationship: r1 is more than or equal to 4mm and less than or equal to 6mm; the method comprises the steps of,

the radius of the second chamfer (24) is r2, and r2 satisfies the relation: r2 is more than or equal to 1mm and less than or equal to 3mm.

8. The extrusion-coated gasket (100) of claim 1, wherein a side of the gasket body (20) facing the gap (13) is provided with a skived zone (25), the skived zone (25) having a smaller width dimension than the gasket body (20).

9. The extrusion-coated gasket (100) of claim 8, wherein the skived zone (25) has a length dimension h3, h3 satisfying the relationship: h3 is more than or equal to 0.5mm and less than or equal to 1mm; the method comprises the steps of,

the skiving area (25) is provided with a third chamfer (251) on one side of the width direction facing the gasket body (10), the radius of the third chamfer (251) is r3, and the r3 satisfies the relation: r3 is more than or equal to 0.3mm and less than or equal to 0.6mm.

10. The extrusion-coated gasket (100) of claim 1, wherein in the length direction, the distance between the first clamping portion (11) and the edge of the gasket body (10) is l3, the length of the extension portion (22) is l4, the l3 and the l4 satisfy the relation: l3 > l4.

11. The extrusion-coated gasket (100) of claim 10, wherein l4 satisfies the relationship: l4 is more than or equal to 10mm and less than or equal to 400mm.

12. A coating apparatus, characterized by comprising:

a first mold;

the second die is arranged below the first die;

the extrusion coated gasket (100) of any of claims 1-11, the extrusion coated gasket (100) being sandwiched between the first die and the second die.