Standing and forming process of liquid-injected aluminum shell lithium ion battery

Abstract

The invention discloses a standing and forming process of a liquid-injected aluminum shell lithium ion battery. The process is carried out according to the following steps of injecting liquid into battery cores in a normal amount; after liquid is injected into the same batch of battery cores, connecting the battery cores in series; placing the battery cores connected in series in a closed box; performing standing on the battery cores for 1-2 hours under normal temperature and normal pressure conditions; then vacuumizing the closed box; performing standing on the closed box for 20-24 hours in avacuum state; injecting nitrogen into the closed box to break the vacuum, performing standing on the closed box at normal pressure for at least 10 min; transferring the battery cores which are stillin parallel after the standing treatment to a forming box; vacuumizing the forming box after the battery cores are connected; performing a forming process according to conventional indexes in the vacuum state; after forming is completed, sealing an aluminum shell battery core opening by using a steel ball. According to the standing and forming process of the liquid-injected aluminum shell lithiumion battery disclosed by the invention, standing is performed under the vacuum condition, on the one hand, the electrolyte in the battery cores is not directly in contact with air in the workshop, andthe HF acid is not generated; on the other hand, internally installed polar plates of the battery cores are sufficiently soaked by the electrolyte so that the quality of the produced battery is goodand stable.

Description

technical field [0001] The invention belongs to the technical field of electrochemical battery manufacturing. Specifically, the invention relates to a manufacturing process of a lithium-ion battery, in particular to a process of standing still and forming an aluminum-shell lithium-ion battery after liquid injection. Background technique [0002] Injecting the electrolyte into the cell is an indispensable process in the manufacture of lithium-ion batteries. In order for the electrolyte to fully infiltrate the plate, the cell must be left for a period of time after the electrolyte is injected, and then the subsequent formation process can be implemented. Since the shell of aluminum-cased lithium-ion batteries is harder than the shell of soft-packed lithium-ion batteries, the battery cells cannot be sealed immediately after the electrolyte is injected, so the built-in electrolyte is exposed to the atmosphere during the subsequent standing and formation periods. The air humidity...

AI Technical Summary

Problems solved by technology

[0003] The invention mainly aims at the problem of exposure of the aluminum shell lithium-ion battery during standing and forming, and proposes a method that is simple, easy to implement, and has a good sealing effect. The aluminum shell lithium-ion battery that does not require the humidity of the workshop is left standing and formed after liquid injection craft

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