Application of ultrasonic metal welding in the battery electrode industry

Battery tab welding

Ultrasonic welding technology can be used to weld the positive and negative tabs and terminals of lithium batteries. This welding method is particularly suitable for connecting multiple layers of copper foil, aluminum foil, or tabs, with up to 120 layers. Because ultrasonic welding is performed at temperatures far below the melting point of metals, it maintains the original properties of the battery tab materials, does not affect their original conductivity, and reduces the chance of deformation.

Welding quality

Ultrasonic welding enables high-quality connections, resulting in smooth, wrinkle-free surfaces on the tabs and electrodes, with no protruding burrs on the back. The weld joints are full, clear, and reliably strong. The welded electrodes exhibit excellent conductivity with extremely low or near-zero resistivity, which is crucial for battery performance.

welding is a fast process with short welding time, requiring no flux, gas, or solder, which greatly improves production efficiency and reduces costs. It can also be automated, further enhancing production efficiency.

Security

Ultrasonic welding is a “cold” welding technique that forms a connection at temperatures far below the metal’s melting point. This helps prevent the battery tabs from overheating during the welding process, thereby improving battery safety.

Adaptability

Ultrasonic welding technology can adapt to the welding needs of battery tabs of different materials and thicknesses, including the welding of soft metals such as copper foil, aluminum foil, copper sheet, and aluminum sheet.

In conclusion, ultrasonic metal welding technology has been widely used in the battery tab industry due to its high efficiency, safety, and reliability. Moreover, with the continuous advancement of technology, its application scope and depth will be further expanded.