Coating operation system used for lithium battery production and manufacture

Abstract

The invention provides a coating operation system used for lithium battery production and manufacture. The coating operation system comprises a bottom plate, side plates, an outer barrel box, a coating unit, a flow guide unit, an inner stirring mechanism and an auxiliary mechanism. The coating operation system can solve the problem that a large number of bubbles exist in stirred slurry in the coating process of existing pole pieces, and therefore in the coating process, the bubbles in the slurry are sprayed on the pole pieces, and when drying is conducted through an oven, the bubbles are broken and white circular spots are formed on the pole pieces, active material at the positions are thin, and micro short circuiting is most likely to be caused in the battery charging and discharging process. Meanwhile, the problems that the existing pole pieces are restricted by the slurry flow speed in the coating process, and therefore slurry coating on the pole pieces is not uniform, the transmission route of lithium ions and electrons becomes far in the charging and discharging process after active material partitions at the thick edge positions are pulverized, the battery internal resistanceis increased, polarization is deepened, and the service life and safety of batteries can be influenced are solved.

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 ...

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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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