Production equipment of battery diaphragm and diaphragm

Abstract

The invention discloses production equipment of a battery diaphragm, and the equipment comprises an unwinding device which is used for sending out a pole piece along a guide shaft according to a preset speed; an extrusion device which is used for uniformly spreading the diaphragm raw material particles on the surface of the pole piece through a die head; a heating device which is used for heating the diaphragm raw material particles; a rolling device which comprises a first compression roller and a second compression roller and is used for rolling diaphragm raw material particles and the pole piece to form a diaphragm compounded with the pole piece; and a winding device which is used for winding the composite diaphragm pole piece into a roll. According to the production equipment disclosed by the invention, the diaphragm raw material particles are uniformly paved on the surface of the pole piece to replace a polyethylene diaphragm or a polypropylene diaphragm which is used as a battery diaphragm in the prior art, so the obtained diaphragm is thinner, and the energy density of a battery using the diaphragm is higher; the contact between the diaphragm and a pole piece interface is tighter, infiltration and diffusion of an electrolyte are facilitated, meanwhile, the transmission path of lithium ions is shortened, and the performance of the obtained lithium ion battery is better.

Description

[0001] field of invention [0002] The invention belongs to the technical field of battery diaphragms, and in particular relates to production equipment and diaphragms for battery diaphragms. Background technique [0003] In 2021, the country has clearly proposed the specific goals of carbon peaking and carbon neutrality, and 65% of the world's economies have also announced their own specific plans for carbon neutrality. As a new energy carrier, lithium-ion batteries play a vital role in reducing carbon emissions. Since the 1990s, battery technology has made significant progress, and all technologies have entered a plateau, but the energy density and cost of batteries are still the key factors restricting their development. As one of the main components of the battery, the separator has always been a key component of the battery, and its cost accounts for about 20% of the cost of the cell. At the same time, because the separator does not participate in the electrochemical rea...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of production equipment and diaphragm of battery diaphragm, which solves the problems of high production cost of existing diaphragm equipment, thick diaphragm produced by the equipment, and low production efficiency, so that the production equipment is simple, the process is easy to control, and the production The thinner separator can significantly increase the energy density of the battery and reduce the cost of the battery

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