Ultrasonic welding head and ultrasonic welding device

Abstract

The invention discloses an ultrasonic welding head which comprises a welding head part, wherein the welding head part is ring-shaped or similar-ring-shaped, and comprises an upper end face and a lower end face; the upper end face comprises an upper hollowed surface hollowed relative to the center of the welding head part, and an upper edge part not hollowed relative to the welding head part; and at least one ultrasonic radiation head is arranged on the upper edge part. Furthermore, the invention also provides an ultrasonic welding device comprising the ultrasonic welding head. Compared with an existing single plane radiation working face, the hollowed surface can remarkably increase a radiation area of a radiation working face of the ultrasonic welding head. In addition, since the hollowed surface adopts a bending vibration mode, the radiation intensity can be more uniform, and the energy coincidence at working points of the ultrasonic radiation heads is improved. Furthermore, with the adoption of the multiple ultrasonic radiation heads, multiple-spot welding can be carried out simultaneously, and the welding efficiency and the welding effect are improved remarkably.

Description

technical field [0001] The invention relates to an ultrasonic welding piece, in particular to an ultrasonic welding head especially suitable for welding cylindrical lithium battery caps and an ultrasonic welding device including the ultrasonic welding head, belonging to the technical field of ultrasonic welding. Background technique [0002] At present, domestic manufacturers of cylindrical lithium batteries often use laser for spot welding or ultrasonic waves for single-point welding when welding the combined cap of the battery. However, welding with lasers often creates overheating that can affect battery performance. In addition, laser welding also has disadvantages such as high internal resistance, high cost, and low efficiency. However, the traditional ultrasonic single-point welding needs to rotate the cap multiple times during the welding process to perform multi-point spot welding to meet the process requirements, and the process is cumbersome and time-consuming. ...

AI Technical Summary

Problems solved by technology

However, welding with lasers often creates overheating that can affect battery performance

In addition, the use of laser welding also has the disadvantages of high internal resistance, high cost and low efficiency.

However, the traditional ultrasonic single-point welding needs to rotate the cap multiple times during the welding process for multi-point spot welding to meet the process requirements, which is cumbersome and time-consuming.

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