Extrusion double coating method

Abstract

The invention provides an extrusion double coating method. The method comprises the steps of slurry transfer, quantity and width determining through extrusion, current collector unwinding, double extrusion coating, drying, and the like. The method has the beneficial effects that after stirred and filtered, slurry is transferred into a backward and forward extrusion head base by a metering and transfer pump, so that the uniformity of the slurry can be improved and the usage amount of the slurry can be accurately controlled; the coating width and the extrusion coating gaps are set via an extrusion die head, so that the coating width and spacing distances can be accurately controlled; further, a current collector is connected between a backward and forward extrusion head and a front and back coating roll from the discharge end of an unwinding mechanism through double extrusion coating and then the distance between the backward and forward extrusion head and the front and back coating roll is controlled, the front and back of the current collector are coated with the slurry and extrusion coating of the front and back is completed, so that one-time double coating of pole pieces can be achieved, thereby improving the uniformity of the pole piece front and back coating thickness and also reducing the losses of equipment and materials.

Description

technical field [0001] The invention relates to a coating method, in particular to an extrusion double-sided coating method for capacitor pole pieces. Background technique [0002] The pole piece is an important part of the capacitor, the quality of the pole piece directly affects the stability and service life of the capacitor, and the preparation process of the pole piece is to coat the conductive agent and activated carbon on the aluminum foil, so the coating process is the capacitor An important process in the production process of pole pieces. [0003] At present, the coating process of the pole piece generally adopts the method of single-sided coating, which has low coating efficiency and high loss of equipment and materials, and the thickness of the front and back sides of the pole piece is uneven after coating, which is prone to torsion. Cracking and peeling phenomenon, resulting in unstable capacitors and reduced service life. Contents of the invention [0004] ...

AI Technical Summary

Problems solved by technology

[0003] At present, the coating process of the pole piece generally adopts the method of single-sided coating, which has low coating efficiency and high loss of equipment and materials, and the thickness of the front and back sides of the pole piece is uneven after coating, which is prone to torsion. Cracking and peeling phenomenon, resulting in unstable capacitors and reduced service life

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