Lithium-ion battery pole piece ultrasonic rolling machine

Abstract

An ultrasonic film-rolling machine for wave lithium ion battery pole pieces consists of an unreeling motor (F), an ultrasonic rolling assembly, a frame (J) and a reeling motor (S). The ultrasonic rolling assembly is formed by successively connecting a cylinder (Q), an ultrasonic transducer (C), an amplitude transformer (C2) and a film-rolling pressure head (C3). An anvil block (C4) is arranged below the film-rolling pressure head (C3). A film-rolling station is disposed between the film-rolling pressure head (C3) and the anvil block (C4). The wave energy amplitude of a longitudinal wave is utilized and transmitted to lithium ion battery coating pole pieces, under the pressure intensity effect of the cylinder, the particle sections of the lithium ion battery coating pole pieces are subjected to resultant force compression of the longitudinal wave impulse and the cylinder pressure intensity in the thickness direction; and by utilizing the resultant force of a transverse wave impulse and the cylinder pressure intensity, the particles of the lithium ion battery coating pole pieces are mutually extruded, so that the coating pole pieces have no parallel slip during rolling, and the bonding structure of the coatings and current collectors is not destroyed.

Description

technical field [0001] The invention relates to lithium ion battery manufacturing equipment, in particular to a film rolling machine for lithium ion battery pole pieces. Background technique [0002] The lithium-ion battery consists of a positive electrode, a negative electrode, a diaphragm and an electrolyte. The active material of the positive electrode and the negative electrode sheet is coated on both surfaces of the current collector copper foil or aluminum foil with a slurry prepared from granular materials. It is necessary to pass a rolling film process, rolling (or called rolling film) to coat the surface coating of the current collector copper foil or aluminum foil, to eliminate the gaps between the active material particles, so as to improve the compactness of the coating. The quality of the rolling film is closely related to the performance of the lithium-ion battery. Small coating density and large gaps will lead to an increase in the internal resistance of the b...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantage that the film rolling process of the existing lithium-ion battery pole piece film rolling machine needs to go through the three stages of biting-drag-rolling-rolling steel rolling principle, and propose a lithium-ion battery with an improved film rolling mechanism Pole piece ultrasonic rolling machine

This displacement effect leads to mechanical displacement and peeling of the colloidal bond and the current collector structure. The lithium-ion battery pole piece ultrasonic film rolling machine of the present invention can overcome the existing steel rolling principle. The three-stage rolling method improves the problem of uneven deformation of the surface layer, center layer, current collector and coating two-phase interface layer caused by the rolling die of the existing steel rolling principle, especially overcomes the "biting" phase-induced parallel slip

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