Soft-packed lithium ion battery manufacturing process

Abstract

The invention provides a soft-packed lithium ion battery manufacturing process which comprises the following steps: S1, after a bare cell is wound, the bare cell is put into an electrolyte tank in a dry and oxygen-free environment until the electrolyte level reaches the tab glue position of the bare cell, the bare cell is soaked for 10 seconds to 2 hours, and the temperature of electrolyte is maintained at 20 to 150 DEG C; S2, the soaked bare cell is taken out, and the bare cell is dried at 20-150 DEG C until the bare cell does not drop electrolyte anymore and the content of the electrolyte meets a preset value; and S3, the bare cell is put into an aluminum-plastic film after being dried, top sealing is carried out first, and then, side sealing and air bag edge sealing are carried out at the same time, and thus, packaging is completed. Compared with the prior art, the bare cell is directly placed and soaked in the electrolyte tank and dried, side sealing and air bag edge sealing are carried out at the same time, and by improving the existing process, the standing time is greatly shortened, the process flow is simplified, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a manufacturing process of a soft-pack lithium-ion battery. Background technique [0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. They are widely used in portable appliances, electric tools, large Energy storage, electric transportation power supply and other aspects have broad application prospects. Lithium-ion batteries are mainly divided into cylindrical batteries, square batteries and soft pack batteries according to their shapes, while cylindrical batteries and square batteries are also called hard shell batteries. Compared with hard-shell batteries, soft-pack batteries have the characteristics of flexible design, lighter weight, low internal resistance, less explosion, more cycle times, a...

AI Technical Summary

Problems solved by technology

In the traditional production process, after the top and side sealing process of the battery cell is completed, vacuum baking is performed in advance before the liquid injection to remove the water content, and then the liquid injection process is performed. However, due to the high compaction density of the current battery pole pieces , the diaphragm used is relatively thin, so it often takes a lot of time to stand at room temperature and high temperature after liquid injection, so that the electrolyte can fully infiltrate the cell

However, it takes a long time to stand still, which leads to low production efficiency of the battery. Often, it does not take too much time to stand still in actual production, and too short a standstill time will lead to insufficient absorption of the electrolyte and affect the battery. performance and service life

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