Overflow device for wet lithium ion battery separator extraction equipment

Abstract

The invention relates to an overflow device for wet lithium ion battery separator extraction equipment. The overflow device comprises a flow guiding part and a flow resisting part, wherein the flow guiding part comprises an extraction agent overflow pipe and two overflow tanks; the flow resisting part comprises an overflow tank flow resisting plate and an extraction tank dividing baffle plate; theextraction agent overflow pipe is located on the driving side of an extraction tank and used for communicating extraction agents of two adjacent extraction tanks; the extraction tank dividing baffleplate is located in the middle of the extraction tank; the two overflow tanks are located on the driving side and the operating side of the extraction tank respectively, tightly attached to the wall of the extraction tank and lower than the extraction tank dividing baffle plate by certain distance; the overflow tank flow resisting plate is located in the middle of the overflow tank located on thedriving side. With the adoption of the overflow device, flowing travel of the extraction agent in single extraction tank is substantially increased, backmixing of the extraction agents with differentconcentrations in the front position and the back position in an original tank is reduced, and the extraction efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an overflow device of wet-process lithium-ion battery diaphragm extraction equipment. Background technique [0002] Extraction is the core step of the wet lithium-ion battery diaphragm manufacturing process, which has a significant impact on the performance and appearance of the final product, and is one of the key factors affecting capacity utilization and product qualification. The main equipment of the extraction process is the extraction tank (such as figure 1 shown), the extraction tank is usually composed of 6 to 8 independent extraction units, and two layers of rollers are arranged up and down in each extraction unit. The extractant is dissolved and discharged out of the tank with the extractant, and the oil film becomes a pure PE diaphragm. The new extractant is added continuously from the last extraction unit, and the flow of extractant betwee...

AI Technical Summary

Problems solved by technology

However, limited by the solubility of the extractant to the white oil, under the premise of ensuring that the film oil is extracted cleanly, the speed of the extraction equipment provided by the current mainstream extraction equipment suppliers is generally below 50m / min, and the recycling amount of the extractant is as high as 5m 3 More than / h is the biggest factor restricting the speed-up and cost-cutting of the wet-process diaphragm production line

At the same time, the greater the amount of extractant used, the greater the absolute amount leaked into the environment, which brings greater safety hazards to environmental safety.

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