Intermittent extrusion coating method, extrusion coating head and extrusion coating machine

Abstract

The invention relates to an intermittent extrusion coating method, an extrusion coating head and an extrusion coating machine. The coating method includes that a first transfer roller and a second transfer roller are parellelly arranged at predetermined intervals; a base material winds the first pass roller and the second transfer roller and advances towards the same direction; an extrusion head is arranged and located on one side of the base material, the side of the base material is far away from the first transfer roller and the second roller, a seam port of the extrusion head is right opposite to the surface of the base material between the first transfer roller and the second transfer roller, and slurries can be intermittently coated towards the base material from the seam port of the extrusion head. The extrusion head can be close to the surface of the base material as much as possible so as to achieve a purpose of scumbling; the coating thickness can reach below 20 mu m; simultaneously, the problem that the base material is broken is solved; when coating is started, by means of a plurality of different structures, the surface of the base material slowly approaches the extrusion head, and the gap between the extrusion head and the surface of the base material is gradually shortened, so that the problem that the extrusion head is thick is solved; and when coating is finished, the surface of the base material is rapidly far away from the extrusion head, the gap between the extrusion head and the surface of the base material is rapidly enlarged, so that the problem of trailing is solved.

Description

technical field [0001] The invention relates to an intermittent extrusion coating method for coating a lithium battery base material, an extrusion coating head and an extrusion coating machine. Background technique [0002] Extrusion coating heads on existing extrusion coating machines for lithium battery coating, such as figure 1 As shown, it includes an extrusion head 100 and a back roller 200, the extrusion head 100 faces the back roller 200, and the substrate 300 (generally copper foil or aluminum foil) passes through the gap between the back roller 200 and the extrusion head 100 The gap travels in one direction around the back roller 200 , and the extrusion head 100 intermittently applies the electronic paste 400 to the substrate 300 . Due to the structural design of this extrusion coating head, there have always been four problems. One is that the electronic paste is thick at the beginning, which is called head thickness in the industry. When starting coating, th...

AI Technical Summary

Problems solved by technology

From the results of the test, this coating method has very high requirements for coating control. If the control is slightly deviated, not only will it not be able to solve the problems of head thickness and tailing, but it will be counterproductive

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