Method and device for injecting electrolyte into lithium battery

Abstract

The invention discloses a method for injecting electrolyte into a lithium battery, including the flowing steps: (1) forming a negative pressure state or a vacuum state in an inner chamber of a battery; (2) quantificationally adding electrolyte into a liquid injection cup; and (3) injecting the electrolyte into the inner chamber of the battery at negative pressure state or in a vacuum state. The invention also discloses a device for injecting electrolyte into a lithium battery. The device comprises the liquid injection cup, a first sealing mechanism and a second sealing mechanism, wherein a sealing chamber is formed in the liquid injection cup, the bottom of which is provided with a liquid injection mouth installed on a liquid injection hole in the battery during liquid injection; an extract opening and a liquid feeding opening are arranged on the side wall of the sealing chamber; the first sealing mechanism comprises a slide bar penetrating through the sealing chamber, and the end part of the slide bar can control the liquid injection mouth to open and close; and the second sealing mechanism comprises a sealer which can control the liquid feeding opening to open and close. By adopting the method and the device, the purpose for injecting the electrolyte into the battery in the vacuum state can be realized, air inflation or air extraction can be carried out to accelerate permeation, the injection speed is high, quantificational injection can be carried out, the uniformity is good, and automatic operation can be realized.

Description

technical field [0001] The invention relates to a production method and a device of a lithium battery, in particular to a method and a device for filling an electrolyte of a lithium battery. Background technique [0002] In the production process of lithium batteries, the electrolyte needs to be injected quantitatively into the battery packaging. Rigid-packed lithium batteries usually reserve a process hole in the casing for liquid injection. The process hole is small to facilitate final sealing, or open injection is used liquid craft. The traditional injection method is to use manual needle injection, or soak and fill, and then move it into the static equipment to stand for infiltration. These methods need to be divided into operations, and the injection volume is not accurate, the consistency is poor, the standing time is long, and the production The efficiency is low, the labor intensity is high, and it is not conducive to automatic operation. Therefore, it is necessary...

AI Technical Summary

Problems solved by technology

The traditional injection method is to use manual needle injection, or soak and fill, and then move it into the static equipment to stand for infiltration. These methods need to be divided into operations, and the injection volume is not accurate, the consistency is poor, the standing time is long, and the production Low efficiency, high labor intensity, more unfavorable for automatic operation

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