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CN-224208403-U - Coating gasket and pole piece coating device

CN224208403UCN 224208403 UCN224208403 UCN 224208403UCN-224208403-U

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a coating gasket and a pole piece coating device. The coating gasket comprises a first flow guide plate, a gasket body and a second flow guide plate which are sequentially connected, wherein the first flow guide plate and the second flow guide plate are arranged at intervals along the length direction of the gasket body so as to form a coating flow groove, the first flow guide plate, the gasket body and the second flow guide plate enclose to form a flow guide groove communicated with the coating flow groove, a first chamfer is arranged at the corner of the first flow guide plate at the outlet of the coating flow groove, the first flow guide plate is formed by outwards protruding extension of the direction of the second flow guide plate from the first chamfer, a second chamfer is arranged at the corner of the second flow guide plate, a second step is formed by outwards protruding extension of the direction of the first flow guide plate from the second chamfer, and the thicknesses of the first step and the second step are all smaller than that of the coating gasket. The utility model can reduce the thickness of the sizing agent coated on the edge of the pole piece, thereby avoiding the problem of thicker edge of the pole piece.

Inventors

  • YE YONGQIANG
  • Ni Mingxian

Assignees

  • 广东风华新能源股份有限公司

Dates

Publication Date
20260508
Application Date
20250506

Claims (10)

  1. 1. The utility model provides a coating gasket, its characterized in that, including first guide plate, gasket main part and the second guide plate that connects gradually, first guide plate with the second guide plate is followed the length direction interval of gasket main part sets up, so as to form the coating chute, first guide plate, gasket main part and second guide plate enclose to form with the coating chute intercommunication and be used for with the guiding gutter of outside coating die head intercommunication, in the exit of coating chute, the corner of first guide plate is provided with first chamfer, first guide plate is from first chamfer, towards the outside outstanding extension in direction of second guide plate is formed with first step, the corner of second guide plate is provided with the second chamfer, the second guide plate is from the second chamfer, towards the outside outstanding extension in direction of first guide plate is formed with the second step, first step with the thickness of second step is less than the thickness of coating gasket.
  2. 2. The coated gasket of claim 1 wherein the first step and the second step each comprise integrally formed first and second sub-steps, the first sub-step being right triangle shaped, the second sub-step being rectangular, the first right angle side of the first sub-step being flush with a long side of the second sub-step, the second right angle side being flush with a wide side of the second sub-step, the long side of the second sub-step being parallel to the side wall of the coating launder.
  3. 3. The coated gasket of claim 2 wherein the distance between the first baffle and the second baffle is 400-650mm and the second sub-step is 10-20mm in length and 2-4mm in width.
  4. 4. A coated gasket according to claim 3, wherein the first right-angle side of the first sub-step has a length of 2-3mm.
  5. 5. The coated gasket of claim 4 wherein the second right angle side of the first sub-step is 2-4mm in length.
  6. 6. The coated gasket of claim 1 wherein the thickness of said first step and said second step are each 20% -60% of the thickness of said coated gasket.
  7. 7. The coated gasket of any one of claims 1-6 wherein said first baffle and said second baffle are disposed axisymmetrically about a centerline of said gasket body.
  8. 8. The coated gasket of any one of claims 1-6 wherein the first baffle, gasket body, second baffle, first step, and second step are integrally formed.
  9. 9. The coated gasket of any one of claims 1 to 6 wherein said gasket body is provided with locking holes for locking said coated gasket to an external coating die.
  10. 10. A pole piece coating device comprising a coated shim according to any one of claims 1 to 9.

Description

Coating gasket and pole piece coating device Technical Field The utility model relates to the technical field of lithium battery production, in particular to a coating gasket and a pole piece coating device. Background The lithium ion battery pole piece coating is a key process in battery production, and aims to uniformly coat uniformly stirred slurry on a current collector (an anode is aluminum foil and a cathode is copper foil) and dry the slurry to form the pole piece. In the pole piece coating process, in order to reduce the energy consumption of pole piece coating and improve the coating drying efficiency, the slurry has high solid content and viscosity, poor fluidity and high surface tension, and the slurry tends to shrink, and the slurry is likely to be thicker at the edge due to shrink accumulation, so that the coating at the edge of the pole piece after coating is thicker. After the coiled materials are collected, the edges of the pole pieces are raised, and when the edge is severe, the pole pieces are exploded and broken, so that the quality of the pole pieces is improved. The existing extrusion coating mode is that chamfering treatment is carried out at the outlet position of a coating gasket, when slurry is sprayed out from the outlet of the gasket, the chamfering design can partially release fluid pressure, the problem of protruding edges of pole pieces is relieved to a certain extent, but the effect is not ideal, the situation that the edges of the pole pieces are thicker still occurs at a higher probability, and the quality problem is caused. Disclosure of utility model The technical problem to be solved by the embodiment of the utility model is to provide a coating gasket and a pole piece coating device so as to solve the problem that the edges of two sides of a pole piece are thicker after pole piece coating operation in the prior art. The utility model discloses a coating gasket which comprises a first guide plate, a gasket body and a second guide plate which are sequentially connected, wherein the first guide plate and the second guide plate are arranged at intervals along the length direction of the gasket body so as to form a coating launder, the first guide plate, the gasket body and the second guide plate are enclosed to form a diversion launder which is communicated with the coating launder and is used for being communicated with an external coating die head, a first chamfer is arranged at the corner of the first guide plate at the outlet of the coating launder, a first chamfer is formed at the corner of the first guide plate, a second chamfer is formed at the corner of the second guide plate, a second step is formed at the corner of the second guide plate, the second chamfer is formed at the corner of the second guide plate, and the thicknesses of the first step and the second step are smaller than the thickness of the coating gasket. Optionally, the first step and the second step each include an integrally formed first sub-step and a second sub-step, the first sub-step is in a right triangle shape, the second sub-step is in a rectangle shape, a first right-angle side of the first sub-step is flush with a long side of the second sub-step, a second right-angle side is flush with a wide side of the second sub-step, and a long side of the second sub-step is parallel with a side wall of the coating launder. Optionally, the distance between the first guide plate and the second guide plate is 400-650mm, and the length of the second sub-step is 10-20mm, and the width of the second sub-step is 2-4mm. Optionally, the length of the first right-angle side of the first sub-step is 2-3mm. Optionally, the second right-angle side of the first sub-step has a length of 2-4mm. Optionally, the thickness of the first step and the second step is 20% -60% of the thickness of the coated gasket. Optionally, the first deflector and the second deflector are axisymmetrically disposed about a center line of the gasket body. Optionally, the first guide plate, the gasket body, the second guide plate, the first step and the second step are integrally formed. Optionally, the gasket body is provided with a locking hole for locking the coating gasket on an external coating die. The utility model also discloses a pole piece coating device which is characterized by comprising the coating gasket according to any one of the above. Compared with the prior art, the coating gasket and the pole piece coating device have the beneficial effects that the coating gasket comprises the first guide plate, the gasket main body and the second guide plate which are sequentially connected, the first guide plate and the second guide plate are arranged at intervals along the length direction of the gasket main body to form the coating launder, the first guide plate, the gasket main body and the second guide plate enclose to form the diversion trench communicated with the coating launder, the slurry of the external coating die head enter