Liquid injection device and liquid injection method of polymer lithium battery electrolyte

Abstract

The invention provides a liquid injection device and a liquid injection method of polymer lithium battery electrolyte. The liquid injection device comprises a plurality of vacuum liquid injection chambers; the bottom of each vacuum liquid injection chamber is connected with a vacuum pipeline, and the other end of the vacuum pipeline is connected with a vacuum pump; the top of each vacuum liquid injection chamber is connected with a liquid injection pipeline; each branch end, inserted into a corresponding vacuum liquid injection chamber, of the liquid injection pipeline is fixedly provided with a liquid injection needle, and the other main end of the liquid injection pipeline is connected with a liquid storage chamber; a liquid injection pump is arranged on each branch pipeline used for connecting the liquid storage chamber with the corresponding vacuum liquid injection chamber; a plurality of vacuum chucks are arranged in each vacuum liquid injection chamber; combination of the vacuum chucks is capable of opening gas bags of batteries, and the liquid injection needles are inserted into the gas bags for injection; and the chamber wall of each vacuum liquid injection chamber is connected with a pressure releasing channel. The liquid injection device and the liquid injection method are capable of accelerating wetting velocity of positive and negative plates and diaphragm by electrolyte in liquid injection process, and increasing production capacity.

Description

technical field [0001] The invention belongs to the technical field of battery processing, and in particular relates to a liquid injection device and a liquid injection method for the electrolyte solution of a soft-packed lithium battery. Background technique [0002] Lithium batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work. During the charge and discharge process, lithium ions are intercalated and deintercalated back and forth between the two electrodes through the electrolyte, so the degree of infiltration between the electrolyte and the positive and negative electrodes is extremely high. Greatly affect the electrical properties of lithium batteries. The soft-packed lithium-ion power battery, especially the flexible-packed lithium-ion battery in the form of large-capacity laminates, has attracted widespread attention because of its high energy density, high rate performance, good cycle performance and superior safet...

AI Technical Summary

Problems solved by technology

Atmospheric pressure injection adopts the method of multiple injections. Generally, 2-3 injections are required to meet the requirements of the injection volume. At the same time, it needs to be left for a long time after the injection to ensure the infiltration effect of the electrolyte, and the production efficiency is low.

The method of negative pressure liquid injection is to inject liquid into the battery first and then vacuumize and infiltrate. This method can increase the speed of liquid injection, but it is easy to overflow the electrolyte during the vacuuming process, resulting in loss of electro-hydraulic. The battery needs to be replenished with liquid, and the operation is more complicated, so the vacuum in the cabin is generally low during negative pressure liquid injection, generally -10KPa

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