One-side coating equipment and coating method of non-woven lithium-ion battery diaphragm

Abstract

The invention relates to a non-woven type lithium-ion battery separator single side coating device and a coating method thereof. The device comprises a non-woven type lithium-ion battery separator unwinding device, a micro-concave coating device, a back covering roller, a synchronous belt device I, a synchronous belt device II, a primary drying channel, a secondary drying channel, a final-stage drying channel, a non-woven type lithium-ion battery separator winding device, a phase conversion device and a cloth guide roller, when the coating is carried out, according to different transmissions of the non-woven type lithium-ion battery separator in the phase conversion device, and the functional requirements of the water-based coating liquid and the solvent-based coating liquid for the singleside coating on the non-woven type lithium-ion battery separator are achieved. The prepared non-woven type lithium-ion battery separator has the advantages that the flatness is high, the roughness issmall, and the coating is uniform, no leakage coating phenomenon exists on the coating of the separator, the problem that non-coating layer infiltration of the non-woven type separator is uneven is effectively solved, and the consistency of battery assembly performance is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragm preparation, and in particular relates to a non-woven lithium-ion battery diaphragm single-side coating device and a coating method thereof. Background technique [0002] With the rapid development of the electric vehicle industry in my country and other countries, high specific energy lithium-ion batteries have been paid attention to and vigorously developed. As one of the four key materials of high specific energy lithium-ion batteries, the separator plays a vital role in the charge and discharge performance, safety and cycle life of the battery. [0003] Commercialized polyolefin microporous separators have fatal defects such as low temperature resistance, large heat shrinkage, small porosity, poor electrolyte wettability, and poor electrolyte liquid absorption and liquid retention capabilities, which affect the safety of high specific energy lithium-ion batteries. , cycl...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the deficiencies and limitations of existing coating equipment and coating methods in the single-sided coating of non-woven lithium-ion battery diaphragms, the invention provides a non-woven lithium-ion battery diaphragm single-sided coating equipment and The coating method solves the problem that the coating liquid penetrates into the non-coated surface of the non-woven lithium-ion battery separator to affect the coating effect of the bonding equipment, realizes continuous operation, and satisfies the requirements of water-based coating liquid and solvent-based coating at the same time. The technical application of layer liquid in the single-side coating of non-woven lithium-ion battery diaphragm has broad industrial application prospects

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