Soft-package lithium ion battery shell punching structure

Abstract

The invention discloses a soft-package lithium ion battery shell punching structure, which comprises a shell and a bare electric core, wherein the shell includes a first sub-shell and a second sub-shell; the first sub-shell and the second sub-shell form a first concave portion after the pit punching process, and the first concave portion forms a pit punching region and a gas bag region connected with the pit punching region after the pit-punched first sub-shell and second sub-shell are buckled; the pit punching region is used for placing the bare electric core; the gas bag region is used for adding an electrolyte and accommodating a gas generated during the battery formation; and there is a second concave portion at the junction of the pit punching region and the gas bag region. By adopting the soft-package lithium ion battery shell punching structure, a stable channel for electrolyte inflow or gas extraction can be formed, the electrolyte injection efficiency can be significantly improved, the gas extraction speed is stable, and the electrolyte is also avoided from polluting the shell.

Description

technical field [0001] The invention relates to the technical field of punching structures for lithium ion batteries, in particular to a punching structure for soft-pack lithium ion batteries. Background technique [0002] With the advancement of science and technology and the continuous development of new energy sources, lithium-ion batteries are widely used due to their high operating voltage, large specific energy, no pollution, no memory effect, and many cycles of use. product application. [0003] During the manufacturing process of the existing soft-pack lithium-ion battery, the strength here is enhanced to a certain extent due to the existence of the angle at the intersection of the punching area and the air bag area, so that when the air bag is opened, the area still remains closed to a certain extent. Affects the speed of gas vacuum extraction and electrolyte injection, so soft pack batteries often require multiple cycle steps of liquid injection-vacuum standing-li...

AI Technical Summary

Problems solved by technology

[0003] In the manufacturing process of the existing soft-packed lithium-ion battery, due to the existence of the angle between the punching pit area and the air bag area, the strength of this area is enhanced to a certain extent, so that when the air bag is pulled open, this area still remains closed to a certain extent. Affects the speed of gas vacuum extraction and electrolyte injection, so soft-pack batteries often need multiple cycle steps of liquid injection-vacuum standing-liquid injection-vacuum standing to obtain the target liquid injection volume, which has a great impact and liquid injection efficiency

At the same time, when the gas is drawn out from the unstable slit, the speed is fast, and it is easy to bring up the electrolyte, causing the electrolyte to pollute the shell and produce defective products.

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