During the manufacturing process of aluminum case battery, for the lug with more layers, it is necessary to weld the lug of multi-layer lug with the lug guide of cover plate through ultrasonic welding machine after pre welding. If the number of electrode lug layers is small, the multi-layer electrode lug and the cover plate electrode lug tab can be directly welded without pre welding; If the thickness of lug tab of cover plate is large, pre welding is required even if the number of lug layers is small. The pre welding plays a role of shaping, which is conducive to the welding between the cover plate lug tab and the lug.

The equipment with lower power can be selected, and the equipment with higher power can be selected when welding the cover plate. In order to ensure the welding quality, it is necessary to use tension equipment to check the welding effect, and adjust the welding parameters according to the test results until the welding effect is good.