Coater for diaphragm coating

Abstract

The invention provides a coater for diaphragm coating. The coater comprises an unreeling roller, a gluing device, even groups of vertical type baking oven units, traction rollers, guide rollers, a flattening roller, a reeling roller and a main traction motor. The gluing device comprises a material liquid tank and a coating roller. The coating roller is arranged above the material liquid tank. The vertical type baking oven unit comprises a first vertical type baking oven and a second vertical type baking oven in a way of symmetrical arrangement. The unreeling roller, the coating roller, the traction rollers, the guide rollers, the flattening roller and the reeling roller are linked with the main traction motor. One side of the gluing device is provided with the unreeling roller. One of the vertical type baking oven units is arranged above the gluing devices. The traction rollers are arranged above all the vertical type baking oven units. The guide rollers are arranged below another one of the vertical type baking oven units and is orderly transmission-connected to the flattening roller and the reeling roller. Through the coater, the coating system realizes complete removal of the solvent in a diaphragm.

Description

technical field [0001] The invention relates to the field of manufacturing battery separators, in particular to a coating machine for coating separators. Background technique [0002] The development and modification of lithium-ion battery diaphragm materials is currently the most difficult focus of new energy industry development, and it is also an area where the current technical level is far behind that of foreign countries. Its production technology and equipment are mainly monopolized by several large international companies. China It is difficult for domestic enterprises to obtain first-class equipment and related technologies. The technical difficulties are: first, compared with ordinary thin films, the thickness of the lithium battery diaphragm is very thin, and the current main models used are generally within 20 microns, and leading manufacturers in the industry have begun to apply coating diaphragms with 9 micron substrates; second, due to the current The diaphra...

AI Technical Summary

Problems solved by technology

However, such equipment can no longer meet the needs of diaphragm coating. The main problems are as follows:

[0004] According to the needs of the development of lithium battery technology, the diaphragm coating is now more coated with some heat-resistant resin or inorganic ceramic materials, and these materials generally use organic solvents with higher boiling points (above 120 ° C) or low solid content and It is difficult to completely volatilize the liquid (such as water, etc.). For these coating systems, the existing equipment is limited by the length of the vertical oven, it is difficult to achieve complete solvent drying, and it seriously affects the coating speed, and even some coating systems cannot be used at all. application

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