Extrusion coating machine and coating system thereof

Abstract

The invention relates to an extrusion coating machine and a coating system thereof, wherein the coating system comprises an extrusion head and a control valve, a valve body of the control valve comprises a three-way valve and a two-way valve, the first end of the three-way valve is the feed end, the second end is connected with a return port, the third end is connected with one end of the two-way valve, the other end of the two-way valve is connected with the extrusion head, a return valve core and a return opening and closing valve are arranged in the second end of the three-way valve, the return opening and closing valve is arranged on the return valve core, the return valve core is connected with a driving device thereof, a feed valve core and a feed opening and closing valve are arranged in the two-way valve, the feed opening and closing valve is arranged on the feed valve core, and the feed valve core is connected with the driving device thereof. The costing system has simple structure and convenient control, and can realize the gap coating and improve the gap coating quality of the extrusion coating machine; furthermore, the valve body is convenient to clean and the process applicability to lithium ion batteries is quite good.

Description

technical field [0001] The invention relates to a lithium battery manufacturing equipment, in particular to an extrusion coating machine and a coating system thereof. 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 substrate (aluminum foil or copper foil), to ensure that the thickness of each coating position is consistent, and to control the coating thickness to the process requirements. within the tolerance range. [0003] At present, there are two coating methods in China: transfer type and extrusion type. Transfer type is a mature technology, but its structure is complex and equipment debugging is troublesome. The performance of the material will be affected to a certain exten...

AI Technical Summary

Problems solved by technology

However, for a long time, the extrusion coating machine can only carry out continuous coating, and cannot realize the intermittent coating according to the requirements of the process standard during the coating process, which has caused the post-production process of lithium-ion batteries to be scraped. , that is, to scrape off the electrode powder in the coating gap required by the process standard, which wastes raw materials and consumes manpower

[0005] In foreign countries, extrusion coating machines can realize gap coating through high-sensitivity control valves, but high-sensitivity control valves are all electronically controlled valves with complex structures and expensive prices. There is no technical ability to develop such control valves in China. , resulting in an expensive extrusion coating machine, which is far more expensive than the transfer coating machine; at the same time, the high-sensitivity control valve is difficult to maintain because of its complex structure. In terms of cost performance, it cannot compete with transfer coating machines

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