Button cell pin and welding method thereof

Abstract

The invention discloses a button cell pin and a welding method thereof, and particularly relates to the field of button cells. The pin comprises a wire, wherein the wire is specifically a single-corewire, the wire is made of a single metal or alloy material with a melting point close to that of a cell steel shell, and the wire is welded with the cell steel shell through a welding pin. The weldingmethod comprises the steps of starting welding after a lead is machined; preparing a hole sealing coating by adopting asphalt-based aluminum paste, mineral alcohol and hydrotalcite, coating the welding part of the battery steel shell with the hole sealing coating, welding the wire and the battery steel shell through an electric welding machine, and coating the welding part with the hole sealing coating again after the welding is completed and the temperature is reduced to a certain degree. According to the invention, the lead is set as the single-core wire, and the adopted raw material is themetal or alloy material with the melting point being consistent to that of the battery steel shell, so that the lead can be directly welded on the battery steel shell, the welding process is simple,the welding strength is high, the lead is not easy to break and fall off, the size is small, and the space is saved.

Description

technical field [0001] The embodiments of the present invention relate to the field of button batteries, in particular to a button battery pin and a welding method thereof. Background technique [0002] Button cell, also known as button cell, refers to a battery that looks like a small button. Generally speaking, it has a larger diameter and a thinner thickness (compared to cylindrical batteries such as No. 5 AA batteries on the market). Button batteries are divided into batteries from the shape, and the corresponding battery classifications include cylindrical batteries, square batteries, and special-shaped batteries. [0003] Some batteries with solder feet or leads are connected as follows: [0004] (1) The riveted lead wire or the connecting piece and the lead wire are cold welded, and then welded to the battery by resistance welding to form a battery-connecting piece-wire integration (see figure 2 ); the disadvantages are: the cold welding or riveting connection betwe...

AI Technical Summary

Problems solved by technology

[0004] (1) The riveted lead wire or the connecting piece and the lead wire are cold welded, and then welded to the battery by resistance welding to form a battery-connecting piece-wire integration (see figure 2 ); the disadvantages are: the cold welding or riveting connection between the connecting piece and the wire will have high unreliability, which will easily lead to the disconnection of the wire or poor riveting;

[0005] (2) Use the mold to punch the welding tab and weld the battery through resistance welding to form a battery-soldering tab integration (see image 3 ); the disadvantages are: a large number of soldering dies need to be developed, resulting in high cost, poor versatility, inconvenient and flexible use

The melting point difference between the copper lead wire and the battery steel shell is large, and it is not easy to weld. In addition, the copper wire has multiple strands, and it is not easy to weld firmly. Repeated welding will damage the battery steel shell, or even weld through the battery steel shell, so in order to avoid To damage the steel shell of the battery, copper leads need to be welded or riveted on the connecting piece first. The connecting piece is made of steel, and its melting point is close to that of the steel shell of the battery, so it is easier to weld with the steel shell of the battery. The negative electrode lithium sheet is directly connected to the negative electrode shell of the battery, so it is easy to cause the battery to be damaged by welding (the internal diaphragm is welded through to cause a short circuit) or the welding sheet is easy to fall off.

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