Steel shell button cell and preparation method thereof

Abstract

The invention provides a steel shell button cell and a preparation method thereof. The preparation method of the steel shell button cell comprises the following steps: carrying out punching forming operation on atop cover assembly, a bottom shell and a sealing cover, wherein a containing cavity, a containing opening and a liquid injection opening are punched in the bottom shell, and the liquid injection opening and the containing opening are formed in the two sides of the bottom shell respectively; carrying out first welding operation on a positive tab in the battery cell assembly and the top cover assembly; carrying out second welding operation on a negative tab in the battery cell assembly and the bottom shell; putting the battery cell assembly into the bottom shell, and carrying out cover closing operation; performing first laser welding operation on the edges of the top cover assembly and the bottom shell to obtain a battery to be injected with liquid; performing electrolyte injection operation on the battery to be injected under a vacuum condition; and covering the liquid injection opening with the sealing cover, and carrying out second laser welding operation on the sealing cover and the bottom shell under a vacuum condition to obtain the steel shell button cell. The preparation method of the steel shell button cell can effectively prevent liquid leakage and improve the welding effect.

Description

Technical field [0001] The present invention relates to the field of battery technology, and more particularly to a steel shell buckle battery and a preparation method thereof. Background technique [0002] With the development of portable electronic products and intelligent wear electronics, the battery is required to be more miniaturized. While maintaining a high life, the battery is required to have as high volume ratio energy, quality ratio energy, so the demand for steel shell button is increasing. [0003] The conventional steel shell is typically used in the following two packages. One is that the positive and negative pole housings of the steel shell battery are fastened to each other by the inner diameter, and fixed connection through the card slot at the connection of the upper and lower housing. Second, the upper edge of the positive electrode housing is buckled by the upper edge of the positive electrode housing, so that the negative electrode cover is fixed. Traditio...

AI Technical Summary

Problems solved by technology

The traditional steel case button battery packaging method and the closing method are prone to liquid leakage

In addition, after the top and bottom steel shells are soaked in the electrolyte, a fog and frost surface will be formed on the surface. When the laser is welded at high temperature, the fog and frost layer will be heated and evaporate to generate air bubbles, resulting in weak welds and poor pores in the weld; there is electrolyte on the surface of the steel shell Residue, when the laser high-temperature welding evaporates and releases the mixed gas, resulting in poor discoloration of the weld surface

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