Lithium battery roll core and lithium battery, and manufacturing methods thereof

Abstract

The invention provides a lithium battery roll core. The lithium battery roll core comprises at least two cylindrical core bodies and a long-waist-shaped surrounding edge wrapping the at least two cylindrical core bodies, wherein each cylindrical core body comprises a positive plate and negative electrode units respectively attached to two sides of the positive plate, one ends of the negative electrode units on two sides are partially overlapped, and the negative electrode units wrap the positive plate on the overlapped part; and the negative electrode unit, in a free state, of the cylindrical core body which is located at one end wraps all the cylindrical core bodies to form a surrounding edge. The lithium battery roll core of the invention has the advantages that the two negative electrode units are mutually wound to form the cylindrical core body, so manufacturing efficiency is high, the consistency of the roll core is good, and the advantage of stable interface reaction of the cylindrical roll core is inherited; by configuring a plurality of auxiliary roll cores with small diameters, a heat dissipation area is increased, and the defect of non-uniform internal temperature field is avoided; and the long-waist-shaped square roll core is formed by winding the cylindrical core bodies in a unified mode, transition of arcs at two ends is more uniform, the structure of the roll core is more compact, and the energy density of the lithium battery roll core is effectively improved.

Description

Technical field[0001]The present invention relates to the field of lithium batteries, and more particularly to a lithium battery coil, a lithium battery, and a method of fabricating.Background technique[0002]At present, the core of the power lithium battery is mainly square, the cylindrical categories. The cross section of the square core is elliptical. During the manufacturing process, it is desirable to overcome the pole, the diaphragm of the diaphragm, which leads to the difficulty of the pole, the motion of the diaphragm, low production efficiency, and is easy to cause the core to scrapped due to internal short circuit. The circular arc of the square core is prone to powder, and the chemical reaction interface is poor, which will seriously affect the energy of the lithium battery. The production process of cylindrical core is more mature, high production efficiency, and the core is consistent. Motion, the motion of the diaphragm is more controlled, and the internal chemical reac...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a square and circular integrated winding core, so as to solve the problems of difficulty in rectifying the movement of the square winding core, easy short circuit, poor radial heat conduction of the circular winding core, and uneven internal temperature distribution.

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