Manufacturing method for avoiding problem of faulty soldering of tab and cover plate

Abstract

The invention discloses a manufacturing method for avoiding a problem of faulty soldering of a tab and a cover plate, which is characterized in that: the manufacturing method comprises the following steps of: straightening a battery aluminum tab completely injecting an electrolyte; placing the battery aluminum tab into a fixed tray; inversely turning the tray 180 degrees and placing the tray on a lifting frame, wherein at the moment, a port of a battery case faces downward; turning on a descending button, descending the tray to soak the tab into an ultrasonic cleaning liquid with pure water, setting the frequency to 10KHz and working time to 2min, and cleaning the electrolyte and impurities on the tab; and then drying the tab. The manufacturing method has the advantages of avoiding the problem of the faulty soldering of the tab and the cover plate.

Description

technical field [0001] The invention relates to a manufacturing method for avoiding the problem of false welding between tabs and cover plates. Background technique [0002] At present, with the gradual advancement of automation and the increasing demand for cylindrical lithium-ion batteries, battery manufacturers have begun to use automatic laser welding equipment to replace manual welding tabs. The process is as follows: straighten the battery tabs after liquid injection, Use a cotton ball to stick DMC to wipe it once, then use a cotton ball to stick anhydrous alcohol to wipe it again, and then laser welding; under this kind of process, sparking often occurs during laser welding, resulting in weak welding, low work efficiency, and affecting Battery internal resistance: The defect rate of this process is as high as 9.4%, and the internal resistance of the battery is increased by 10mΩ to 1000mΩ due to weak welding. In addition, since the tabs are covered with electrolyte, i...

AI Technical Summary

Problems solved by technology

[0002] At present, with the gradual advancement of automation and the increasing demand for cylindrical lithium-ion batteries, battery manufacturers have begun to use automatic laser welding equipment to replace manual welding tabs. The process is as follows: straighten the battery tabs after liquid injection, Use a cotton ball to stick DMC to wipe it once, then use a cotton ball to stick anhydrous alcohol to wipe it again, and then laser welding; under this kind of process, sparking often occurs during laser welding, resulting in weak welding, low work efficiency, and affecting Battery internal resistance; the defect rate of this process is as high as 9.4%, and the internal resistance of the battery is increased by 10mΩ to 1000mΩ due to weak welding

In addition, since the tabs are covered with electrolyte, it is inevitable that there will be a problem of false welding of the tabs, which will lead to an increase in the battery resistance and affect the performance of the battery.

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