A method of controlling coating amount

Abstract

The invention belongs to the technical field of coating technology, and discloses a coating weight control method. The method comprises following steps: step 100, obtaining a scan curve (P1) of a to-be-coated surface of a base material; step 200, separating the scan curve (P1) obtained in the step 100 to obtain vertical data (W) and horizontal data (P2); step 300, dividing the horizontal data (P2)into low frequency horizontal data (P2L) and high frequency horizontal data (P2H); step 400, subjecting the low frequency horizontal data (P2L) to two dimensional mapping to obtain two dimensional horizontal data (P3L), and subjecting the high frequency horizontal data (P2H) to multi-dimensional mapping to obtain multi-dimensional horizontal data (P3H); and step 500, according to the vertical data (W), correcting the output flow of coating slurry, based on the two dimensional horizontal data (P3L), correcting a gap (L) between a coating die head and the base material; and according to the multi-dimensional horizontal data (P3H), correcting the width (B) of the material outlet of the coating die head. The coating weight is controlled without artificial interference and the product qualityis largely improved therefore.

Description

technical field [0001] The invention belongs to the technical field of coating technology, and in particular relates to a method for controlling coating amount. Background technique [0002] In the production process of lithium-ion battery pole pieces, there are high requirements for the uniformity of the surface density of the pole pieces in both longitudinal and transverse directions. This uniformity will eventually have a great impact on the performance of lithium-ion batteries. [0003] In the prior art, the coating amount control method is as follows: use the screw pump to perform vertical manual or automatic control at the machine head position, and use the overall left and right movement of the coating die to perform rough manual horizontal control. The horizontal direction is equipped with multiple micrometer manual adjustment mechanisms in turn, so as to manually control the local area in the horizontal direction. [0004] The mode of controlling coating amount in ...

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Problems solved by technology

[0005] 1. In addition to the automatic control of the screw pump, the horizontal adjustment of the pole piece is manual; because the speed of the coating machine is relatively slow, the effect of manual adjustment can only be seen after a few minutes, and the adjustment speed is slow. Repeated adjustments in the middle are likely to cause waste of paint; and the disadvantage of manual adjustment is to adjust passively after the problem is found. are expensive, and the waste is intolerable;

[0006] 2. There is a coupling relationship between the longitudinal control and the horizontal control, and between the die head advance and retreat knife and the micrometer manual adjustment mechanism. It is difficult to distinguish and adjust manually. It depends heavily on the manual operation level. Different people have different adjustment effects;

[0007] 3. When the micrometer manual adjustment mechanism adjusts the area density of a certain partition, the opening of the left and right adjacent partitions should also be considered, otherwise it will easily cause irreversible mechanical deformation, which greatly increases the difficulty of manual operation

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