Internal connection structure of button cell and manufacturing method of internal connection structure

Abstract

The invention provides an internal connection structure of a button cell and a manufacturing method of the internal connection structure. The internal connection structure of the button cell is characterized in that the internal connection structure comprises an upper shell and a lower shell which are arranged in a covering manner; a winding body is arranged between the lower shell and the upper shell; the winding body comprises a positive electrode plate, a negative electrode plate and an isolation body which is positioned between the positive electrode plate and the negative electrode plateand is used for isolating the positive electrode plate from the negative electrode plate; the winding body is provided with a positive electrode tab and a negative electrode tab which respectively extend towards the upper part and lower part of the winding body; the positive electrode tab is connected with the positive electrode plate; the negative electrode tab is connected with the negative electrode plate; and at least one of the positive electrode tab and the negative electrode tab is electrically connected with the inner surface of the upper shell and the lower shell through a liquid metal layer or a low-temperature alloy layer, wherein the inner surface of the upper shell and the lower shell is opposite to the upper end surface and lower end surface of the winding body. With the above structure adopted, the connection between the tabs of the button battery and the battery shells is facilitated, and assembly efficiency is improved; welding equipment is decreased, so that manufacturing cost is saved; and defective products caused by solder skips and incomplete welding can be avoided.

Description

Technical field: [0001] The invention relates to an internal connection structure of a button battery and a manufacturing method thereof. Background technique: [0002] A button battery refers to a battery whose shape is like a small button. Generally speaking, it has a larger diameter and a thinner thickness (compared to cylindrical batteries such as AA batteries on the market). In terms of points, the same corresponding battery classification includes cylindrical batteries, square batteries, and special-shaped batteries. [0003] The wound body in the button cell includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet for isolating the positive and negative electrode sheets. The positive and negative tabs extending above and below the body. At present, both the positive and negative tabs are connected to the battery case by welding. Although the welding method can achieve the purpose o...

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Problems solved by technology

[0003] The winding body in the button battery includes a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet for isolating the positive and negative electrode sheets. The positive and negative tabs extending above and below the body are currently welded when the positive and negative tabs are connected to the battery case. Although the welding method can achieve the purpose of a firm connection, welding is not only The cost of the equipment used is high, and the design of the installation station and tooling takes up a certain amount of space. The space between the welding tab and the inner surface of the battery case is limited, and it is easy to miss the welding or the welding is not in place. The battery case cannot be disconnected when there is a short circuit inside the battery and other high temperature and high pressure phenomena

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