Cylindrical lithium ion battery

Abstract

The invention discloses a cylindrical lithium ion battery which comprises a shell, roll cores, a positive electrode cover plate, a negative electrode cover plate, an insulating film, a positive electrode lug, a negative electrode lug, a positive electrode collector plate and a negative electrode collector plate, wherein a plurality of the roll cores are arranged in the shell, the positive electrode cover plate and the negative electrode cover plate are arranged at the two ends of the shell, the plurality of roll cores are wrapped into a whole through the insulating film, a positive electrode lug and a negative electrode lug are respectively arranged at two end parts of each roll core, the positive electrode lugs are connected with the positive electrode cover plate through the positive electrode collector plate, and the negative electrode lugs are connected with the negative electrode cover plate through the negative electrode collector plate. The cylindrical lithium ion battery disclosed by the invention has the advantages that the use quantity and the welding frequency of single batteries in groups are greatly reduced, the assembly efficiency is improved, and the manufacturing cost is reduced; and the liquid injection amount, the liquid injection efficiency and the heat dissipation capability of the cylindrical lithium ion battery can be effectively improved, and the electrical performance and the safety performance of the cylindrical lithium ion battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion cylindrical battery. Background technique [0002] At present, the development of modern human society is facing severe challenges due to the shortage of global oil resources and the deteriorating climate environment. The development of new energy vehicles that save energy and have no waste emissions has been highly valued by various countries. With the further improvement of the technical threshold requirements of new energy vehicles, the system energy density, cruising range, and safety performance of batteries have become important assessment indicators. [0003] Lithium-ion cylindrical batteries are widely used because of their high shell structure strength and high standardization. For example, the Chinese Utility Model Patent Publication No. CN205790219U discloses a full-tab cylindrical steel-shell lithium-ion battery. However, at present, under...

AI Technical Summary

Problems solved by technology

However, at present, under the condition of a certain battery size, the capacity of lithium-ion batteries is difficult to be significantly improved. At the same time, the further squeeze of the internal space of the battery makes it difficult to inject liquid into the battery and it is difficult to infiltrate, which also brings certain safety risks.

In addition, the system battery pack is generally composed of hundreds of batteries, and each battery needs to be welded, which not only reduces the assembly efficiency, but also increases the manufacturing cost

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