Extrusion head, coating device and coating system

Abstract

A coating system comprises an extrusion head, a transition roll, a base material and a drying box, wherein the base material strides on the transition roll and passes through the extrusion head and the drying box in the base material transmission direction through the transition roll. The head portion of the extrusion head faces to the base material, the extrusion head comprises an extrusion head lower lip and an extrusion head upper lip, the extrusion head upper lip is arranged at the front end in the base material transmission direction, and a channel for slurry to pass is arranged between the extrusion head lower lip and the extrusion head upper lip. The extrusion head is further provided with a cavity which is filled with the slurry from the outside and communicated with the channel. The head portion of the extrusion head lower lip is higher than that of the extrusion head upper lip, and the head portion of the extrusion head lower lip is a fillet. Particularly provided are a coating device and the extrusion head. The slurry can be directly coated on suspended base material through the extrusion head, so that possibility of double-side coating can be achieved. An upper roll and a lower roll are adopted to respectively clamp blank positions on two sides of the base material, and a double-layer stove can achieve simultaneous double-side drying, so that energy consumption can be saved by above 50%. In addition, time for material replacing is saved, the structure is compact and device efficiency is improved.

Description

technical field [0001] The present invention relates to the field of coating machinery, in particular to a lithium battery manufacturing equipment coating machine, in particular to an extrusion head, a coating device and a coating system using the extrusion head. Background technique [0002] Coating is an indispensable process in the production process of lithium-ion batteries, and it is also a key process that directly affects various performances such as battery safety, capacity, and consistency. Coating is to apply the prepared paste-like viscous slurry evenly, continuously or intermittently on the front and back sides of the substrate (aluminum foil or copper foil), to ensure the thickness consistency of each coating position, and Control the coating thickness within the tolerance range required by the process. [0003] The extrusion coating technology at home and abroad is becoming more and more mature, and the coating precision is getting higher and higher. The curr...

AI Technical Summary

Problems solved by technology

In principle, it is no different from single-sided coating. Two sets of coating devices and two independent boxes are still needed, which only saves the time of changing rolls once, and there is no saving in energy consumption.

Moreover, this method requires the control system of the coating equipment to be more complicated and the maintenance cost of the equipment to increase

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