Electrolyte infiltration method of soft package battery cell

Abstract

The invention provides an electrolyte infiltration method of a soft package battery cell, and the electrolyte infiltration method comprises the following steps: (1) packaging the cell and reserving a liquid injection port, so that the included angle between the side edge where the liquid injection port of the cell is located and the horizontal plane is theta1, 0 degree lt; [theta] 1lt; at 90 DEG C, vacuumizing and injecting electrolyte to enable the electrolyte to infiltrate the battery cell from bottom to top; and (2) rotating the battery cell injected with the electrolyte. According to the invention, the battery cell is placed at a certain angle with the horizontal plane and is injected, and the electrolyte is infiltrated by slowly rotating after injection, so that the time required by electrolyte infiltration is greatly shortened, the rapid infiltration of the lithium ion battery cell is realized, the influence of high temperature on electrolyte components is eliminated, the infiltration effect is improved, and the production efficiency is improved. And meanwhile, repeated vacuumizing and rolling are not needed, the production efficiency is improved while the production energy consumption is reduced, and the method is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrolyte infiltration method for soft pack battery cells. Background technique [0002] With high energy density, long service life and good power performance, lithium-ion battery is an important energy storage device and has a wide range of applications in mobile devices, power vehicles and large energy storage devices. Lithium-ion batteries include positive electrodes, negative electrodes, separators and electrolytes. In order to better improve the energy density, cycle performance and service life of lithium-ion batteries, the electrolyte in lithium-ion batteries needs to have good wettability. [0003] In the prior art, in the production process of soft-packed lithium-ion batteries, the normal pressure liquid injection sealing method is mainly adopted, and the long-term normal temperature and high temperature infiltration method is adopted after liquid injec...

AI Technical Summary

Problems solved by technology

The operation steps of this infiltration method are complicated, require high equipment, are not easy to operate, and have high energy consumption, so it is not suitable for large-scale application

Another technical solution is to infiltrate the soft-packed lithium-ion battery through multiple times of clamping, liquid injection, vacuuming, shelving and rolling, and exhausting. The steps are cumbersome and affect production efficiency.

[0005] However, the above-mentioned electrolyte infiltration method takes a long time, has cumbersome steps, consumes a lot of energy, has low efficiency, and requires high equipment, so it is not suitable for large-scale applications.

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