Diaphragm coating machine

Abstract

The invention provides a diaphragm coating machine. The diaphragm coating machine 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, and the ovens are arranged symmetrically. 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 device. The guide rollers are arranged above all the vertical type baking oven units. The guide rollers are arranged below the other one of the vertical type baking oven units, and are orderly transmission-connected to the flattening roller and the reeling roller. Through the diaphragm coating machine, the coating system realizes complete removal of a solvent in a diaphragm.

Description

technical field [0001] The invention relates to the field of manufacturing battery separators, in particular to a separator coating machine. Background technique [0002] The coating modification of lithium-ion battery diaphragm is a hot spot and a difficult point in the lithium battery industry at present. The hot point is that the heat resistance and mechanical strength of the lithium battery diaphragm itself are poor, which can no longer meet the needs of high specific energy density and large capacity battery systems. Therefore, improving its thermal and mechanical properties by coating modification has become an important direction for the development of diaphragm materials at home and abroad. The difficulty lies in: first, the thickness of the diaphragm is very thin, and the current main models used are generally within 20 microns, and the current mainstream diaphragm coating substrate has dropped to about 12 microns; second, because the diaphragm material is made by s...

AI Technical Summary

Problems solved by technology

[0002] The coating modification of lithium-ion battery diaphragm is a hot spot and a difficult point in the lithium battery industry at present. The hot point is that the heat resistance and mechanical strength of the lithium battery diaphragm itself are poor, which can no longer meet the needs of high specific energy density and large capacity battery systems. Therefore, improving its thermal and mechanical properties by coating modification has become an important direction for the development of diaphragm materials at home and abroad.

The difficulty lies in: first, the thickness of the diaphragm is very thin, and the current main models used are generally within 20 microns, and the current mainstream diaphragm coating substrate has dropped to about 12 microns; second, because the diaphragm material is made by stretching process, There is bound to be a problem of transverse arching, and the consistency of the diaphragm substrate used for coating is difficult to ensure

Third, due to the high porosity of the diaphragm, which is generally above 38%, and the large-porosity diaphragm is even above 50%, the mechanical strength of the diaphragm coil is poor, which is manifested in the tensile strength and surface smoothness of the diaphragm. Compared with the same material Ordinary film is much different

In addition, the design of the coating head is not compatible

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