Ultrasonic welding creates solid-state metallurgical bonds with high conductivity.

Batteries for electric vehicles are manufactured by connecting several cells and a bus bar to form a single module. Dozens of modules are then assembled into a battery pack.

The word "welding"; evokes a particular image - the exposed flame of a torch and red hot molten metal. Metal parts are heated to a liquid state to join them to one another. For small scale and electrical products, this isn't a viable bonding method. Ultrasonic welding allows a bond to form between metals, without requiring the metal to leave the solid state.