Electrolyte injection system with vacuumizing function for lithium battery

Abstract

The invention discloses an electrolyte injection system with a vacuumizing function for a lithium battery. The electrolyte injection system comprises a feeding unit, a liquid injection unit, a vacuumizing unit, a sealing unit, a weighing and detecting unit and a discharging unit, wherein the liquid injection unit comprises an intermediate belt conveyor, a battery positioning mold, a lifting board, a first lifting cylinder, a quantitative liquid injector and the like; the weighing and detecting unit comprises a front weighing sensor, a rear weighing sensor, a waste conveyor and the like; the vacuumizing unit comprises a seal cover, a gas-type fitting, a vacuum sensor and a vacuum pump. The capacity of the inner chamber of a quantitative cylinder of the quantitative liquid injector is equal to the standard liquid injection amount of the lithium battery, so that the amount of an electrolyte pushed out by a liquid injection cylinder every time is equal to the standard liquid injection amount of the lithium battery, and the liquid injection precision is high; the vacuumizing unit can prevent a reaction between moisture in air in the seal cover and electrolyte solute lithium hexafluorophosphate to avoid generation of hydrofluoric acid, so that the problem that hydrofluoric acid adversely influences the electrochemical property and the safety performance of the battery is solved.

Description

technical field [0001] The invention relates to battery production equipment, in particular to a battery electrolyte injection machine. Background technique [0002] When the lithium-ion battery is working normally, the negative terminal drawn from the negative current collector and the positive terminal drawn from the positive current collector form an electronic path with the external circuit, and the lithium ions in the electrolyte and the positive and negative active materials form an ion path, an electronic path and an ion path Form a circuit together to achieve the purpose of normal work. As the demand for lithium-ion batteries gradually increases, people have higher and higher performance requirements for them, especially for the cycle performance of the battery, and the liquid injection volume of the battery is an important parameter to ensure the battery cycle. Too little liquid injection will cause the cycle to decay too quickly, resulting in too fast decay of the...

AI Technical Summary

Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide a lithium battery electrolyte injection system with a vacuum function to solve the problem of low efficiency of electrolyte injection in existing lithium batteries, poor injection accuracy, and the inability to prevent atmospheric pollution during injection. The technical problem of the reaction between the water in the electrolyte and the electrolyte solute lithium hexafluorophosphate

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