Preparation method of steel shell button cell, and steel shell button cell

Abstract

The invention provides a preparation method of a steel shell button cell, and the steel shell button cell. The preparation method of the steel shell button cell comprises the following steps of stacking the upper cover plate, the pressure relief insulating sheet and the negative electrode contact sheet in sequence; carrying out hot pressing operation on the upper cover plate, the pressure relief insulation sheet and the negative electrode contact sheet; welding the positive electrode lead with the lower shell, and welding the negative electrode lead with the negative electrode contact piece; acore body of the winding type battery core assembly being placed in a lower shell cavity of the lower shell, the lower shell being covered with the top cover assembly, and the pressure relief insulation sheet and the negative electrode contact sheet being located on the side, away from the lower shell, of the upper cover plate; and welding the upper cover plate and the lower shell to obtain the steel shell button cell. The method is advantaged in that the pressure relief insulating sheet is respectively bonded with the upper cover plate and the negative electrode contact sheet, and when the temperature and the air pressure reach higher values, the pressure relief insulating sheet is heated to slightly deform, and internal air can flow out, so the pressure relief of the battery is completed, and explosion caused by internal short circuit of the battery is prevented.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing a steel case button battery and the steel case button battery. Background technique [0002] With the development of portable electronic products and smart wearable electronic products, batteries are required to be more miniaturized. While maintaining a relatively high lifespan, batteries are required to have as high a volume specific energy and a mass specific energy as possible, so the demand for steel shell button batteries is also increasing day by day. [0003] The traditional steel shell button battery usually adopts the following two packaging methods. One is that the positive and negative shells of the steel shell button battery are fastened to each other through the difference in inner diameter, and are fixedly connected through the snap slots at the joints of the upper and lower shells. ; The second is by turning over the upper edge of the posi...

AI Technical Summary

Problems solved by technology

Since the traditional packaging method adopts a mechanical fit method and requires high processing accuracy, it is prone to liquid leakage caused by poor sealing effect

In addition, when the battery internal temperature rises and expands due to an accidental short circuit, the traditional steel case button battery is difficult to complete the pressure relief due to the mechanical buckle connection, which will easily lead to the explosion of the battery

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