Method for pre-charging lithium ionic cell

Abstract

The invention relates to a method for precharging a lithium ion battery. The method comprises a step of aging an electric core which is filled with the electrolyte, a step of putting the electric core into a precharge cabinet, a step of precharging the electric core and a step of forming a negative pressure, the step of forming the negative pressure means the gas generated in the formation process is discharged from the inner of the electric core during the course of precharging. In particular, the step of forming the negative pressure is vacuumizing and the vacuumizing is performed during the course of precharging. By the method, the electrolyte can not overflow to the surface of the shell in the negative pressure condition, the corrosion of the shell caused by the electrolyte can be reduced, simultaneously the waste of the electrolyte is reduced, some preparatory protective operations are reduced, the technological process is simplified, and simultaneously the electric core is caused to form even SEI films during the forming course of the electric core, which improves the performance of the battery.

Description

technical field [0001] The invention relates to a method for precharging a lithium ion battery. Background technique [0002] Lithium-ion batteries are the third generation of small batteries after nickel-cadmium batteries and nickel-metal hydride batteries. As a new type of chemical power supply, it has the outstanding advantages of high working voltage, large specific energy, stable discharge potential curve, small self-discharge, long cycle life, good low temperature performance, no memory, no pollution, etc. The batteries required by electrical appliances meet the dual requirements of small size, light weight and environmental protection, and are widely used in electronic devices such as mobile communications, notebook computers, and all-in-one cameras. [0003] In the production of lithium-ion batteries, battery manufacturers generally use atmospheric pressure formation charging when producing square batteries. However, in actual production, due to the gas generated d...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for precharging a lithium-ion battery, to solve the problem that normal pressure formation and precharging may cause the electrolyte in the cell to overflow, causing corrosion of the cell shell and loss of electrolyte, and the entire negative electrode The problem of uneven formation of SEI film on the surface of the sheet, thereby reducing production costs and improving the consistency of the battery