Method for removing pole piece coating and pole piece coating cleaning device

Abstract

The invention discloses a method for removing a pole piece coating and a pole piece coating cleaning device. When the pole piece coating is removed, a pole piece is placed on a cleaning platform, and a circular cooling pipeline for circulating cooling fluid is arranged in the cleaning platform; the pole piece is pressed on the cleaning platform by a pressing block, a through groove is arranged on the pressing block; the through groove exposes a to-be-cleaned zone on the pole piece; a vacuum nozzle is arranged on the side wall of the through groove, and the vacuum nozzle is interconnected with a vacuum pipeline arranged in the pressing block; the pole piece zone exposed at the through groove of the pressing block is fired by laser, so as to remove the coating of the zone; when the laser cleans the pole piece coating, the cooling fluid in the platform is cleaned so as to cool the pole piece; the vacuum nozzle on the pressing block can collect the powder grain, and a foil material is shown after the coating is cleaned by laser, thus the cleaning is completed. The invention can guarantee that the pole piece cleaning zone is constantly under a low temperature state, thus preventing an empty foil of the cleaning zone from oxidization, preventing the pole piece of the cleaning zone from deformation and guaranteeing the cleaning degree of the pole piece after cleaning.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a pole piece coating removal method and a removal device. Background technique [0002] Lithium-ion batteries are widely used in digital products due to their high energy density, low self-discharge, and environmental friendliness. In recent years, with the development of drones and electric vehicles, lithium-ion batteries have also received more attention. Higher requirements are placed on the electrochemical performance of batteries such as energy density, internal resistance, and cycle life. At present, how to further increase the capacity of the battery cell has become a technical bottleneck in the field of lithium batteries when the gram capacity of the positive and negative electrode active material materials is maximized. [0003] figure 1 It is a schematic diagram of the structure of a conventional battery pole piece. When producing...

AI Technical Summary

Problems solved by technology

For example, the U.S. Patent No. US8309880B2 discloses a method for removing the coating on the pole piece by laser, but the laser cleaning method still has the following deficiencies: first, the method blows the pole piece with an inert gas while laser cleaning The area to be cleaned to achieve the cleaning and cooling of the pole piece, but this cannot completely remove the coating on the pole piece, which will affect the cleaning effect of the laser beam on the pole piece coating, and cannot effectively collect the removed dust particles, thus affecting the The safety performance of the battery cell; secondly, when the laser removes the coating, heat will be generated and transferred to the light foil. If the light foil is unevenly heated and not effectively fixed, it will cause deformation, which will affect the subsequent production process

However, this method also has some disadvantages: firstly, it is necessary to open a hole on the cleaning platform to realize the vacuum adsorption of the pole piece, but when the vacuum adsorption is used to fix the pole piece, the pole piece corresponds to the vacuum nozzle The area and coating will be sunken inward under the action of vacuum, so that the area to be cleaned deviates from the focus of the laser beam, and there is a risk of unclean cleaning, resulting in false welding of the electrode piece; and if the aperture of the vacuum nozzle is too small, the cleaning of the electrode piece The dust easily blocks the pores, so that the adsorption effect cannot be produced; secondly, the heat generated by laser burning pole pieces will be continuously transferred to the cleaning platform. During the mass production process, the temperature of the platform will continue to rise, even exceeding the pole piece cleaning The heat cannot be effectively transferred during the processing of the pole piece, which will lead to serious oxidation of the surface of the cleaned foil, which will affect the performance of the battery cell.

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