Packaging method of laminated lithium battery case and cover based on friction stir welding

Abstract

The invention discloses a packaging method for a laminated lithium battery casing and a casing cover based on friction stir welding. First, a layer of casing is pre-set outside the casing of the laminated lithium battery to jointly form a layer of casing, and the casing There is a gap between the body and the shell cover, then place the friction stir welding stirring head directly above the lithium battery, and ensure that the stirring needle in the friction stir welding stirring head is directly above the gap, so that the outer shell and the shell cover are used as stirring The support of the friction stir welding stirring head, when the friction stir welding stirring head is started, the stirring needle travels along with the friction stir welding stirring head and performs friction stirring motion at the same time, so as to weld the outer cover, the shell and the shell cover together. The friction stir welding method is used to seal the shell and the shell cover, and a perfect weld with a closed loop and no keyhole is formed during the welding process. The weld has reliable strength and sealing, and has a good application prospect, which is worthy of promotion.

Description

technical field [0001] The invention belongs to the technical field of lithium battery packaging, and in particular relates to a method for packaging a laminated lithium battery case and cover based on friction stir welding. Background technique [0002] Compared with winding batteries, laminated lithium batteries have more quality advantages in all aspects. Therefore, they have been favored by people in recent years. However, laminated lithium batteries need to be aligned with the aluminum casing and casing before use. The existing packaging method is easy to cause problems such as uneven welding seam and ugly appearance, and after the welding is completed, the stirring needle will form a keyhole in the welding seam area, the sealing performance is poor, and it is easy to wear during use , affecting the service life. In addition, when the battery is packaged, the foil and other components have been installed inside the battery, and these components are not heat-resistant. ...

AI Technical Summary

Problems solved by technology

[0002] Compared with winding batteries, laminated lithium batteries have more quality advantages in all aspects. Therefore, they have been favored by people in recent years. However, laminated lithium batteries need to be aligned with the aluminum casing and casing before use. The existing packaging method is easy to cause problems such as uneven welding seam and ugly appearance, and after the welding is completed, the stirring needle will form a keyhole in the welding seam area, the sealing performance is poor, and it is easy to wear during use , affecting the lifespan

In addition, when the battery is packaged, the foil and other components have been installed inside the battery, and these components are not heat-resistant. If the heat input is too large during packaging and welding, the internal components will be damaged, which is not conducive to the sales of the manufacturer and the use of people.