Hot-pressing formation control method for lithium-ion batteries

Abstract

The invention provides a hot-pressing formation control method for lithium-ion batteries. The hot-pressing formation control method comprises the following steps: cell dimensions, working section atmospheric pressure values and working section temperature values of multiple sections are stored; formation clamps are arranged in a formation working chamber and operate in a stepping manner downwards along the formation working chamber; pressure devices and heating devices corresponding to operation control parameters are arranged, the pressure devices apply pressure to cells and regulate the working section atmospheric pressure values of the sections, and the heating devices heat the cells and regulate the working section temperature values of the sections; two formation clamps are arranged in the formation working chamber in parallel, and the parameter devices and the formation clamps operate independently. Automatic section-by-section heating control and pressure application can be realized, the two clamps perform control and operation independently and have functions of data connection, communication, protection and inner tank air exhaustion, and each air exhausting heat sink can assist in operation of the corresponding smoke alarm and eliminates heat in equipment through exhausting, so that the cells are taken out conveniently.

Description

technical field [0001] The invention belongs to the field of hot and cold press formation of lithium ion batteries, and in particular relates to a working method for hot and cold press formation of lithium ion batteries. Background technique [0002] With the advancement of science and technology and the application of electronic equipment, lithium batteries have been used in all aspects of life. The manufacturing process of sheet-shaped lithium batteries generally includes the following processes: stirring, coating, cold pressing, cutting, winding (or stacking), liquid injection, formation, capacity, etc. Among them, formation is a very critical process to improve the electrical performance of lithium batteries. Formation is the process of activating the active material inside the battery by passing an appropriate low current at both ends of the electrodes of the initially formed battery. The hot-press formation of soft-packed lithium-ion batteries can eliminate the bak...

AI Technical Summary

Problems solved by technology

In the existing chemical formation system, cabinet-type loading and clamping is mostly used. When lithium batteries enter the chemical formation process, multiple lithium batteries are generally loaded into the pressurized fixture at the same time and the same peripheral environment is used for chemical formation. This limits the need for consistent battery specifications for mass production

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