End surface welding cylindrical lithium battery

Abstract

The invention discloses an end surface welding cylindrical lithium battery and belongs to the technical field of electrochemical power sources. The battery comprises a housing and a battery cell coated in the housing, wherein a mandril is arranged in the center of the battery cell; the surfaces of an anode framework and a cathode framework exposed at the two ends of the battery cell are in plane structures; an anode current collector is welded on the surface of the anode framework; a cathode current collector is welded on the surface of the cathode framework; an anode conductive pole tab and a cathode conductive pole tab are welded on the surfaces of the anode current collector and the cathode current collector respectively; an end cover conductive disc is welded and connected with the outside end surface of each of the anode conductive pole tab and the cathode conductive pole tab; an end cover plate is welded and connected with each of a front open end and a rear open end of the housing; and the end cover plates package the end cover conductive discs in the housing. The battery has the advantages that the battery is simple and convenient to manufacture, and has a good current collection effect, the performances of the lithium power battery are greatly improved, and at the same time, the automatic production of high-power, extra-high-capacity cylindrical lithium power battery assembly is also facilitated.

Description

[0001] technical field [0002] The invention relates to a lithium battery structure, in particular to an end-face welded cylindrical lithium battery, which belongs to the technical field of chemical power sources. Background technique [0003] With the development of cordless electric tools, cordless home appliances, electric vehicles, and wind and solar power, there is an increasing demand for power and energy storage batteries, especially lithium power batteries. The high-capacity and high-power performance of lithium batteries has attracted more and more attention. For a long time, due to the problem of current collection, the lithium battery industry has generally believed that low-capacity conventional batteries are produced using a small cylindrical process, and high-capacity or high-power batteries are produced using a square lamination process. [0004] As we all know, the positive and negative electrode frameworks of lithium battery pole pieces are copper foil and...

AI Technical Summary

Problems solved by technology

Although end-face welding technology is also applied to common power batteries such as nickel-metal hydride batteries and nickel-cadmium batteries, its technology and current collectors cannot be directly applied to the field of lithium power batteries.

The most critical constraints are that the very thin copper foil and aluminum foil framework of the positive and negative poles of the battery cannot be processed, and the second is that there is no current collector suitable for end-face welding of lithium batteries.

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