Cylindrical lithium battery and manufacturing method thereof

Abstract

The invention provides a cylindrical lithium battery and a manufacturing method thereof. The cylindrical lithium battery of the present invention comprises: a housing; the full-tab roll core is provided with a kneaded positive end surface and a kneaded negative end surface; a central tube; and two cover plates, two flow deflectors, two current collecting discs, two current collecting sheets and two insulating supports. Wherein the cover plate is welded with one end of the shell in a closed manner, a cover plate boss is punched at the central position of the cover plate, and an electrode column is mounted in the cover plate boss. A flow deflector boss matched with the cover plate boss is punched at one end of the flow deflector, and the flow deflector boss is electrically connected with the electrode column and connected to the cover plate in advance. The current collecting disc is welded with the end face of the rubbing electrode, a central pipe positioning hole is formed in the central position of the current collecting disc, and the current collecting sheet is connected to the central position of the current collecting disc in advance and is connected with the flow deflector after being bent at a preset bending position. And one side end of the insulating bracket is clamped and fixed on the collector plate, the other side end of the insulating bracket is propped against the cover plate, and the outer edge of the insulating bracket is propped against the inner wall of the shell.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a cylindrical lithium battery and a manufacturing method thereof. Background technique [0002] Compared with prismatic batteries, cylindrical batteries have poor power performance, short life and poor safety. The poor power performance of the cylindrical battery is mainly caused by the unreasonable design of the diversion structure; part of the reason for the short life is related to the small amount of liquid injected into the battery; at the same time, the large cylindrical battery has poor heat dissipation, high battery center temperature, and poor battery safety. [0003] In the Chinese patent CN104218208A, there is a slit with the same pattern as the winding core on the collector plate, and after the pole piece blank guide layer is drawn out from the slit, it is welded to the conductive copper film on the edge of the slit by continuous laser welding. The curr...

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents have no better solution for the poor heat dissipation of cylindrical batteries, especially the heat dissipation problem at the center of large cylindrical batteries.

Images