Rolling needle

Abstract

The invention discloses a rolling needle. The rolling needle comprises a left needle body and a right needle body in parallel arrangement on the left side and the right side, an upper needle body and a lower needle body in parallel arrangement up and down, a clamping gap formed between the left needle body and the right needle body, a left-right needle body displacement driving device for driving the left needle body and the right needle body to move away from each other or close to each other along the left-right direction, and an up-down needle body displacement driving device for driving the upper needle body and the lower needle body to move away from each other or close to each other along the up-down direction; clamping teeth positioned at the position of the clamping gap are arranged on the left needle body and the right needle body respectively; and circular arc-shaped outer surfaces, with the same semi-diameter, which correspond to one another are arranged on the left needle body, the right needle body, the upper needle body and the lower needle body respectively. The rolling needle has a circular outer contour, a membrane and pole pieces are wound according to the circular outer contour respectively during winding, the tension fluctuation is low, too great vibration cannot be caused for the pole pieces, and the production efficiency is greatly improved.

Description

technical field [0001] The application relates to the field of lithium battery production equipment, in particular to a winding needle, which can be used for winding processing of power lithium battery core packs. Background technique [0002] In the existing lithium battery equipment, the winding needle of the winding machine is an important part of battery winding, and the shape of the winding needle affects the winding speed of the battery and the quality of the battery core. Most of the current winding machines adopt elliptical and flat rhombic needle rolling mechanisms. The tension of these two structures fluctuates all the time due to the inconsistency of the curvature of the shape during winding, which is difficult to measure and control; the feeding direction is perpendicular to the direction of the separator, and the cells are flattened after the winding and blanking. The movement direction of the innermost diaphragm cannot be controlled, which will cause the inner...

AI Technical Summary

Problems solved by technology

The tension of these two structures fluctuates all the time due to the inconsistency of the curvature of the shape during winding, which is difficult to measure and control; the feeding direction is perpendicular to the direction of the separator, and the cells are flattened after the winding and blanking. The movement direction of the innermost diaphragm cannot be controlled, which will cause the inner diaphragm to be discounted

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