CN2936531Y - Ultrasonic welding device for welding lithium-ion battery tab and cover assembly - Google Patents

Abstract

The utility model relates to an ultrasonic welding device for welding lithium battery tabs and cap components, which comprises an ultrasonic welding machine and a positioning mould, wherein the positioning mould is arranged under the welding head of the ultrasonic welding machine and a positioning groove is arranged in the positioning mould. The utility model is characterized in that a convex table is arranged at the bottom of the positioning groove. The utility model solves the technical problem that the cap components and battery tabs are bended when welded by ultrasonic welding devices.

Description

Ultrasonic welding device for welding lithium-ion battery tab and cover assembly

technical field

The utility model relates to lithium-ion battery production equipment, in particular to an ultrasonic welding device for welding a lithium-ion battery tab and a cover assembly.

Background technique

The prismatic lithium-ion battery includes a cylinder, an electrode assembly and an electrolyte contained in the cylinder, and a cover assembly for sealing the cylinder; the electrode assembly is a positive and negative electrode sheet formed by a separator and a predetermined active material coated on a metal substrate It is formed by winding, and the positive pole piece and the negative pole piece are respectively provided with positive pole tabs and negative pole tabs for drawing current; the positive pole tabs and negative pole tabs are electrically connected to the cover assembly and the cylinder body respectively. The welding of the positive tab and the cover assembly is welded by an ultrasonic welding machine; the existing welding process is as follows: first, the cover assembly is positioned in the welding mold of the ultrasonic welding machine, and then the welding head of the ultrasonic welding machine welds the cover assembly and the positive tab as one. Because there are burrs remaining from machining around the cover plate, the stamping of the welding head will bend and deform the cover assembly during welding, causing the cover assembly and the cylinder to fail to match, so that the battery cannot be welded and sealed.

Utility model content

The purpose of the utility model is to solve the technical problem that the cover assembly and the tab are bent by an ultrasonic welding machine, and provide an ultrasonic welding device for welding the cover assembly and the tab.

The technical scheme of the utility model: the ultrasonic welding device used for welding the lithium-ion battery tab and the cover assembly includes an ultrasonic welding machine and a positioning mold. The positioning mold is arranged below the welding head of the ultrasonic welding machine, and the positioning mold is provided with a positioning concave The groove is characterized in that a boss is also arranged on the bottom surface of the positioning groove.

Further, the width of the boss is smaller than the width of the positioning groove.

Further, the height of the boss is smaller than the depth of the positioning groove.

On the basis of the original welding device, the utility model solves the deformation problem of the cover assembly caused by welding by arranging a boss on the bottom surface of the positioning groove of the positioning mold.

Description of drawings

Fig. 1 is a perspective view of an ultrasonic welding device for welding a lithium-ion battery tab and a cover assembly,

Fig. 2 is a 2-fold enlarged view of the A-A sectional view of Fig. 1,

Fig. 3 is a schematic diagram of welding the assembly and tabs by the welding device.

Detailed ways

As shown in Figure 1 and Figure 2, the ultrasonic welding device for welding the tab and cover assembly of lithium-ion batteries includes an ultrasonic welding machine 1 and a positioning mold 3, and the positioning mold 3 is arranged under the welding head 2 of the ultrasonic welding machine 1, Wherein positioning mold 3 is provided with positioning groove 4, and positioning groove 4 bottom surface is provided with boss 5, and this boss 5 width is less than positioning groove 4 widths, and boss 5 height is less than positioning groove 4 depths, when cover assembly After being positioned in the positioning groove 4 , the remaining burrs or corners on the cover assembly are accommodated on both sides of the boss 5 .

Referring to Fig. 3, the positioning groove on the positioning mold 3 positions the cover assembly 7, because the positioning groove 7 is supported by the boss 5, therefore, the cover assembly 7 will not be supported by the burrs thereon, when the welding head 2 goes down to apply pressure When welding the cover component 7 and the tab 8, the welding head 2 will not compress and deform the cover component 7, and the welding effect is good.

Claims (3)

1, is used to weld the ultrasonic brazing unit of lithium ion cell polar ear and cap assemblies, comprise ultrasonic welding machine, jig, jig is arranged on the below of ultrasonic welding machine soldering tip, jig is provided with detent, it is characterized in that, also be provided with boss on the bottom surface of described detent.

2, the ultrasonic brazing unit that is used to weld lithium ion cell polar ear and cap assemblies as claimed in claim 1 is characterized in that, described boss width is less than the detent width.

3, the ultrasonic brazing unit that is used to weld lithium ion cell polar ear and cap assemblies as claimed in claim 1 or 2 is characterized in that, described boss height is less than the detent degree of depth.