Lithium-ion battery and manufacturing method thereof

Abstract

The invention relates to a lithium-ion battery and a manufacturing method thereof. The lithium-ion battery comprises a battery core assembly, wherein the battery core assembly comprises a plurality of positive plates and a plurality of negative plates; the plurality of negative plates and the plurality of positive plates are alternately arranged; the positive plates and the negative plates are stacked at intervals; and the positive plates are separated from the negative plates through a membrane. The lithium-ion battery and the manufacturing method thereof provided by the invention have the production efficiency of a wound battery; and a laminated battery has better battery performance than the wound battery. Meanwhile, the positive plates and the negative plates are fixed on the membrane, so that the interface stability and the safety of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium ion battery and a manufacturing method thereof. Background technique [0002] Due to its high voltage, long life, and high specific energy, lithium-ion secondary batteries have been commercialized since the end of the last century, along with the rapid development of consumer electronics such as mobile phones, notebook computers, and digital cameras. It has been applied on a large scale, and the energy and environmental problems that have become more significant in recent years have made lithium-ion secondary batteries widely used as power sources in automobiles, which also puts forward higher requirements for lithium secondary batteries. One of the key points is the consistency after the points are grouped. [0003] The power battery currently used in automobiles has both a wound structure and a laminated structure. Compared with laminated batteries, wound ...

AI Technical Summary

Problems solved by technology

Compared with laminated batteries, wound batteries have the advantages of high production efficiency and simple and easy control of the process. However, due to the uneven internal structure of wound batteries, unavoidable deformation is caused by inconsistent tension at each position during the cycle. , resulting in poor consistency and even a great security risk

Although stacked batteries can greatly improve battery performance compared with wound batteries, the process is cumbersome and the production efficiency is low, especially in the stage of stacking individual pole pieces sequentially, which takes a long time

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