Double-dislocation coating method and device

Abstract

The invention relates to the field of energy storage devices, in particular to a double-dislocation coating method and a device. The method comprises the following steps: after a substrate is tensioned and conveyed to a coating position, a gap between the substrate and a dislocation lip mold head is changed to bond a surface to be coated with the dislocation lip mold head; the surface to be coated is coated by a kiss coating mode; and after the coating reaches a preset length, the gap between the substrate and the dislocation lip mold head is changed to deviate the surface to be coated from the dislocation lip mold head. The device comprises a first roller, a second roller, a moving module and a kiss coating module; the kiss coating module includes the dislocation lip mold head; the dislocation lip mold head is positioned between the first roller and the second roller in the conveying direction, and is towards the surface to be coated; and the moving module is connected with at least one of the first roller, the second roller and the kiss coating module, can drive the first roller, the second roller or the dislocation lip mold head to change the gap between the substrate and the dislocation lip mold head, and bonds / deviates the surface to be coated with / from the dislocation lip mold head. 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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