Liquid injection device and liquid injection method

Abstract

The invention belongs to the technical field of lithium-ion battery production equipment, and in particular relates to a liquid injection device, which includes a liquid injection cup cavity, an upper fixing plate, a lower fixing plate, a liquid injection nozzle, a liquid injection port, a first blocking rod, a second blocking rod The rod, the first drive assembly and the second drive assembly, the upper end surface and the lower end surface of the liquid injection cup cavity are in close contact with the upper fixed plate and the lower fixed plate respectively, the liquid injection port is arranged on the upper fixed plate and the liquid injection port is connected with the injection port The cavity of the liquid cup is connected, the liquid injection nozzle is located under the lower fixing plate and the liquid injection nozzle is connected to the cavity of the liquid injection cup, the upper fixing plate is provided with a through hole communicating with the cavity of the liquid injection cup, and the end of the through hole is connected with a Gas nozzle. The present invention improves the existing liquid injection device of lithium-ion batteries from the principle of liquid injection, and changes the existing single liquid injection into reciprocating small-scale repeated liquid injection to remove residual air bubbles in dead corners inside the battery core, thereby greatly improving the performance of the battery. The qualification rate of the cell injection process improves the quality of the cells in the liquid injection process without affecting the overall production capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery production equipment, and in particular relates to a liquid injection device and a liquid injection method. Background technique [0002] In the lithium-ion battery manufacturing industry, it is necessary to inject liquid into the battery cells so that the cells can fully contact and absorb the electrolyte before the next step of packaging can be performed. However, a small amount of air bubbles will be generated during the liquid injection process, and the residual air bubbles will seriously affect the quality of the battery itself and the safety of the subsequent process. [0003] In the existing liquid injection process of lithium-ion batteries, after the electrolyte is injected into the battery cell from the liquid injection cup, the residual liquid is vacuum-extracted at one time, and then directly enters the next process. Because the liquid injection system of the existing lithi...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a liquid injection device for the deficiencies of the prior art to solve the problem of residual bubbles in the liquid injection of the lithium-ion battery cell during the liquid injection process, thereby improving the battery life to a large extent. Product quality at core injection stage

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