Method for reducing gas production bumps of soft package lithium ion battery and soft package lithium ion battery

Abstract

The invention discloses a method for reducing gas generation bumps of a soft package lithium ion battery and the soft package lithium ion battery, and the method comprises the following steps: S1, carrying out standing treatment on the soft package lithium ion battery after liquid injection, so that a pole piece, a diaphragm and an electrolyte of the soft package lithium ion battery are fully infiltrated; S2, performing formation and capacity grading treatment on the soft package lithium ion battery; S3, carrying out shallow cycle charging and discharging treatment on the soft package lithium ion battery; S4, measuring a first open-circuit voltage of the soft package lithium ion battery; S5, performing high-temperature aging treatment on the soft package lithium ion battery; S6, measuring a second open-circuit voltage of the soft package lithium ion battery; S7, performing air exhaust and secondary sealing treatment on the soft package lithium ion battery. The method can effectively solve the problem that in a traditional method, air extraction and sealing are carried out immediately after a formation stage, and a subsequent capacity grading stage, a shallow cycle charging and discharging stage, a high-temperature aging stage and other stages are neglected, so that the soft package lithium ion battery swells due to gas production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for reducing gas swelling in a soft-pack lithium-ion battery and a soft-pack lithium-ion battery. Background technique [0002] Soft-pack lithium-ion batteries have the characteristics of high energy density, long storage time, small size and high cycle times, and are widely used in many fields such as electric vehicles. Before the soft-pack lithium-ion battery leaves the factory, it needs to be charged and discharged for the first time, and hydrogen, ethylene, carbon monoxide and other gases will be released during the first charge-discharge process, which will cause the soft-pack lithium-ion battery to bulge due to gas production, seriously affecting the soft-pack Use of lithium batteries. Therefore, it is necessary to perform degassing treatment before the soft-pack lithium-ion battery leaves the factory. The prior art is mainly to carry ou...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing gas bulges in soft-pack lithium-ion batteries and a soft-pack lithium-ion battery, which can effectively solve the problem of ignoring the follow-up capacity division stage and shallow cycle charge and discharge in the traditional practice due to immediately pumping and sealing after the formation stage The bulging problem of soft-packed lithium-ion batteries caused by gas production in stages and high-temperature aging stages

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