A coating operation system for lithium battery production

Abstract

The invention provides a coating operation system for the production of lithium batteries, including a base plate, a side plate, an outer cylinder box, a coating unit, a diversion unit, an internal stirring mechanism and an auxiliary mechanism; the invention can solve the problem of existing Due to the large amount of air bubbles in the stirred slurry during the coating process of the pole piece, the air bubbles inside the slurry are sprayed on the pole piece during the coating process. When the pole piece is dried in an oven, the bubbles burst and a white round spot is formed on the pole piece. The active material coating here is relatively thin, and micro-short circuit is most likely to be caused during the charging and discharging process of the battery; at the same time, the current electrode sheet is restricted by the flow rate of the slurry during the coating process, resulting in poor slurry coating on the electrode sheet. Uniformity, after the active material particles at the thick side are crushed, the transmission path of lithium ions and electrons becomes farther during the charging and discharging process, which will lead to increased internal resistance of the battery and deepened polarization, which will affect the service life and safety of the battery. .

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a coating operation system for lithium battery production. Background technique [0002] The production and manufacture of lithium-ion batteries is a process closely linked with each process step. Overall, the production of lithium batteries includes the pole piece manufacturing process, battery assembly process, and final liquid injection, pre-charging, formation, and aging processes. Slurry coating is the next process after the slurry preparation is completed. The main purpose of this process is to evenly coat the slurry with good stability, good viscosity and good fluidity on the positive and negative electrode current collectors. Electrode coating is of great significance to lithium batteries. [0003] Due to the large amount of air bubbles in the stirring slurry during the coating process of the existing pole piece, the air bubbles inside the slurry are ...

AI Technical Summary

Problems solved by technology

[0005] The present invention can solve the problem that there are a large number of air bubbles in the stirred slurry in the coating process of the existing pole piece. During the coating process, the air bubbles inside the slurry are sprayed on the pole piece. white round spots

The active material coating here is relatively thin, and micro-short circuit is most likely to be caused during the charging and discharging process of the battery; at the same time, the current electrode sheet is restricted by the flow rate of the slurry during the coating process, resulting in poor slurry coating on the electrode sheet. Uniformity, after the active material particles at the thick side are crushed, the transmission path of lithium ions and electrons becomes farther during the charging and discharging process, which will lead to increased internal resistance of the battery and deepened polarization, which will affect the service life and safety of the battery.

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