Method for manufacturing lithium secondary battery

Abstract

The invention discloses a method for manufacturing a secondary lithium battery, pertaining to the field of battery. The method includes the procedures that an anode piece and a cathode piece are prepared; the anode piece, a diaphragm and the cathode piece are stacked up or coiled into an electric core, enclosed in a soft packaging shell or an aluminum shell or a steel shell, and pre-encapsulated to achieve a battery blank; the battery blank is dried and dry nitrogen is injected into the battery blank; the battery blank dried in vacuum and ready for injection of fluid is arranged in the fluid injection environment with ambient temperature ranging from 0-40 DEG C and humidity ranging from RH6-60 percent; under the fluid-injection environment, proper amount of electrolyte is injected into the battery blank by a fluid injector; then the battery fillet is sealed, and then formation, capacity grading, checking and packaging are conducted to achieve a finished product. The whole production process does not need any glove-box, water and oxygen-free drying chamber and other protection measures. And high energy consumption can be avoided, therefore, secondary lithium batteries can be produced at low cost and high efficiency.

Description

technical field [0001] The manufacturing method of the lithium secondary battery of the present invention belongs to the battery field, and in particular relates to a manufacturing method of the lithium secondary battery. Background technique [0002] Lithium secondary batteries use aluminum-plastic composite film, or aluminum shell, or steel shell as the battery shell packaging material. The shape can be made into a triangle, square, cylinder, etc., and there is a positive electrode sheet composed of a positive electrode current collector and a positive electrode film material. , a negative electrode sheet composed of a negative electrode current collector and a negative electrode film material. A separator is added between the positive and negative electrodes to form the basic battery structure - the battery blank, and the electrolyte is filled in the gap of the battery blank to become a battery. Although the manufacturing process of the lithium secondary battery is diffe...

AI Technical Summary

Problems solved by technology

[0006] 3. All items entering and exiting the glove box must pass through the intermediate warehouse, especially the intermediate warehouse for entering objects. It must first be vacuumized and filled with dry inert gas for many times to make the atmosphere in the warehouse reach the atmospheric condition of the glove box before moving the items from the intermediate warehouse into glove box, very inconvenient

[0007] 4. It is very inconvenient to operate with long arm gloves in the glove box, the accuracy is low, the labor efficiency is low, and the product repeatability and consistency are poor.

[0008] 5. It affects the health of the operator, especially when the human arm is stretched into the airtight glove with the long arm. After the water discharged from the human body condenses in the glove, it will not only make people feel uncomfortable, but also easily cause diseases such as dermatitis and herpes.

This method needs to install a special normally closed valve on each battery packaging shell, which is not very convenient for mass production. During the process of installing the special normally closed valve, the electrode material may absorb water, and the production efficiency is still low, and the normally closed valve also need cost