Circulating liquid injection device and process for lithium battery

Abstract

The invention relates to the field of lithium battery preparation, in particular to a circulating liquid injection device and process for a lithium battery. The circulating liquid injection device designed in the invention comprises a lithium battery with a liquid injection hole and a reflux inlet, an electrolyte storage tank, a liquid injection pipe, a liquid injection cup, a circulating pump anda circulating pipe, wherein the electrolyte storage tank, the electrolyte injection pipe, the electrolyte injection cup and the lithium battery are sequentially connected end to end to form an electrolyte injection passage; and the liquid injection cup, the lithium battery, the circulating pump and the circulating pipe are sequentially connected end to end in a closed-loop manner to form a closedelectrolyte circulating passage. Compared with an existing lithium battery liquid injection device, the electrolyte injection device comprises the electrolyte injection passage and the electrolyte circulating passage; the electrolyte is injected into the lithium battery through the electrolyte injection passage, and the electrolyte circulates in the lithium battery through the electrolyte circulating passage, so that the electrolyte and pole pieces are fully infiltrated, complex vacuumizing and vacuum breaking processes are avoided, and the liquid injection efficiency of the lithium battery is improved.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a lithium battery cycle liquid injection device and a liquid injection process. Background technique [0002] At present, most lithium-ion batteries are injected with electrolyte using the "high pressure and equal pressure" injection method. The main process flow of lithium-ion battery injection is now, vacuuming, liquid injection, pressurization, vacuum pressurization, standing, secondary Liquid injection and battery discharge. This method needs to vacuumize and break the vacuum inside and outside the lithium battery many times. It needs to accurately control the pressure inside and outside the battery. In addition, the internal pressure of the battery will be higher than the external pressure of the battery during the liquid injection process. Poor pressure control will lead to battery bulging, deformation, and explosion-proof valve bursting, etc., which will affect p...

AI Technical Summary

Problems solved by technology

[0002] At present, most lithium-ion batteries are injected with electrolyte using the "high pressure and equal pressure" injection method. The main process flow of lithium-ion battery injection is now, vacuuming, liquid injection, pressurization, vacuum pressurization, standing, secondary Liquid injection and battery discharge. This method needs to vacuumize and break the vacuum inside and outside the lithium battery many times. It needs to accurately control the pressure inside and outside the battery. In addition, the internal pressure of the battery will be higher than the external pressure of the battery during the liquid injection process. Poor pressure control will lead to battery bulging, deformation, and explosion-proof valve bursting, etc., which will affect production efficiency and product quality; and this injection method has low injection efficiency and low absorption rate of electrolyte by the battery; in addition, the inside of the battery The metal dust and impurities cannot be discharged, which will affect the electrochemical performance of the battery

Images