Novel flexibly-packaged lithium ion battery and preparation method therefor

Abstract

The invention discloses a novel flexibly-packaged lithium ion battery and a preparation method therefor. The service life of the flexibly-packaged lithium ion battery can be prolonged, and the safety performance can be improved; two rings of sealed packaging edges are arranged on the periphery of an aluminium plastic film cell of the flexibly-packaged lithium ion battery; the two packaging edges comprise an inner side packaging edge and an outer side packaging edge; and an inert gas airbag is arranged between the inner side packaging edge and the outer side packaging edge. According to the novel flexibly-packaged lithium ion battery, the inert gas airbag is arranged around the cell part of the novel flexibly-packaged lithium ion battery, so that the internal cell is isolated from the external; moisture in the outside is hard to penetrate the packaging part and enter the interior of the cell, so that the service life of the battery is prolonged, and the production cost is saved; the inert gas airbag is arranged around the cell part of the novel flexibly-packaged lithium ion battery; the inner side packaging is relatively thick and the outer side packaging is relatively thin, so that when the interior of the battery cell is inflated, the inner side packaging part is inflated to be opened firstly, and the inert gas enters the cell part; therefore, a large amount of air is prevented from entering the interior of the cell to react with lithium to result in danger, and the safety performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to a soft-pack lithium-ion battery with high safety performance and long service life. Background technique [0002] Soft-pack lithium-ion batteries have high energy density, good safety performance and rate performance, and have become the most ideal power source at present. With the rapid development of new energy sources, people put forward higher and higher requirements for lithium-ion battery performance, especially safety performance. and service life requirements. [0003] At present, the outer packaging of soft-pack lithium-ion batteries is aluminum-plastic film, which will inevitably infiltrate into the air during long-term use after vacuum packaging. Moisture and impurities in the air will inevitably affect the service life of lithium-ion batteries. In addition, lithium-ion batteries will be damaged. When the internal air pressure is too high, the aluminum-pla...

AI Technical Summary

Problems solved by technology

[0003] At present, the outer packaging of soft-pack lithium-ion batteries is aluminum-plastic film, which will inevitably infiltrate into the air during long-term use after vacuum packaging. Moisture and impurities in the air will inevitably affect the service life of lithium-ion batteries. In addition, lithium-ion batteries will be damaged. When the internal air pressure is too high, the aluminum-plastic film packaging part expands, and the inside of the lithium-ion battery contacts the air, and the lithium inside the battery reacts with the air, causing danger. In order to improve the service life of the soft-pack lithium-ion battery and reduce the safety hazard of the soft-pack lithium-ion battery , first of all, it is necessary to improve the structure of the soft-pack lithium-ion battery

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