Method for preventing surface corrosion of flexible packaging lithium-ion battery

Abstract

The invention provides a method for preventing surface corrosion of a flexible packaging lithium-ion battery. The method comprises: after a battery core positive sealing process during flexible packaging lithium-ion battery assembling, attaching a protective film additionally; subjecting the protective film attached lithium-ion battery to the normal operation processes of post-baking fluid injection, formation, air suction, capacity grading and shaping in order; and tearing off the attached protective film before final lithium-ion battery detection and storage. The method of the invention protects the flexible packaging battery in production from the perspective of physical protection, effectively improves product qualification rate and reduces production cost.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing technology, and particularly relates to a method for preventing surface corrosion of a soft-packaged lithium ion battery. Background technique [0002] With the widespread application of lithium-ion battery technology and the improvement of production, the production process is gradually optimized and improved, and the improvement of the production process directly affects the pass rate of lithium-ion battery production. The current soft packaging lithium ion battery outer film is a three-layer structure aluminum-plastic composite film. The appearance of the aluminum-plastic composite film is easily corroded by the electrolyte. Once it is stained with the electrolyte, the electrolyte will slowly penetrate into the aluminum. The aluminum layer in the middle of the plastic composite film seriously affects the outer packaging of the flexible battery, and even destroys the aluminu...

AI Technical Summary

Problems solved by technology

The current outer film of flexible packaging lithium-ion batteries is a three-layer aluminum-plastic composite film. The appearance of the aluminum-plastic composite film is easily corroded by the electrolyte. The aluminum layer in the middle of the plastic composite film seriously affects the outer packaging of the flexible packaging battery, and even damages the aluminum layer, resulting in battery leakage, etc. At present, there is no effective treatment method for the surface of the flexible packaging battery corroded by the electrolyte. scrapped

Therefore, in the production process of flexible packaging lithium-ion batteries, the electrolyte should be avoided as far as possible from adhering to the surface of flexible packaging batteries. However, in actual production, battery scrapping caused by corrosion of the battery surface due to electrolyte is not uncommon, almost 1%.

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