Double-dislocation coating method and device

Abstract

The invention relates to the field of coating processing, in particular to a double-dislocation coating method and device. The method comprises the following steps of: in a substrate tightening conveying process, adopting a negative-pressure source to fit and adsorb a to-be-coated surface; after conveying a substrate to a coating position, moving a negative-pressure source, and enabling the to-be-coated surface to fit to a dislocation lip mould head; adopting a kiss-coating mode to coat the to-be-coated surface; and after coating to predetermined length, moving the negative-pressure source, and enabling the to-be-coated surface to separate from the dislocation lip mould head. The device comprises a first roller, a second roller, a negative-pressure assembly, a moving assembly and a kiss-coating assembly, wherein the first roller and the second roller are arranged in parallel at intervals; the negative-pressure assembly comprises an absorption head which is positioned between the first roller and the second roller in the conveying direction; the kiss-coating assembly comprises the dislocation lip mould head which is positioned between the absorption head and the second roller in the conveying direction, and faces towards the to-be-coated surface; and the moving assembly is connected with the negative-pressure assembly, and can drive the absorption head to move. The double-dislocation coating method and device can guarantee uniform coating weight.

Description

technical field [0001] The present application relates to the field of coating processing, in particular to a double dislocation coating method and device. Background technique [0002] In related technologies, lithium batteries are generally coated by extrusion coating, which can be specifically divided into single dislocation coating and double dislocation coating. [0003] Compared with single dislocation coating, double dislocation coating can significantly increase energy density and reduce material waste. However, in the double dislocation coating process, one side of the substrate must be dislocated first to form a single side area and a blank area, and when coating the other side of the substrate, the back roller will alternate with the coating area and the blank area Cooperate, and there will be a significant height difference when transitioning from the single-sided area to the blank area, resulting in a huge drop in the blank area during double-sided coating, whi...

AI Technical Summary

Problems solved by technology

However, in the double dislocation coating process, one side of the substrate must be dislocated first to form a single side area and a blank area, and when coating the other side of the substrate, the back roller will alternate with the coating area and the blank area Cooperate, and there will be obvious height difference when transitioning from one-sided area to blank area, resulting in a huge drop in the blank area during double-sided coating, which will affect the coating weight and cause uneven coating weight

[0004] The uneven coating weight is likely to cause the risk of lithium deposition, and during the cycle cycle, due to the uneven current density distribution, the local position of the battery cell will overheat, and the isolation film is easy to shrink and deform at high temperature, which will cause the battery cell to short-circuit and catch fire. pose a security risk

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