Ultrasonic Battery Welding Machine
Equipment Overview
The ultrasonic battery welding machine is a core piece of processing equipment used in the battery assembly stage, specifically designed for metal tab and connector welding in cell manufacturing and module assembly. It uses high-frequency mechanical vibration to create solid-state bonds between metals, replacing conventional soldering and resistance welding.
Applications
On the battery production line, this machine handles three primary welding tasks:
Tab welding: Joining the positive and negative tabs (aluminum or copper strips) extending from the cell to the current collector foils. This is the most critical electrical connection point inside the cell.
Module series/parallel welding: Using nickel strips or aluminum connectors to join multiple cell terminals into series and parallel configurations, forming complete battery modules.
Protection circuit board (PCB) welding: Attaching the battery pack's output tabs to the corresponding pads on the protection circuit board.
The equipment accommodates various battery formats, including pouch cells, cylindrical cells (such as 18650 and 21700), and prismatic aluminum-shell cells.
Key Features
Low-temperature process: The welding temperature stays well below the melting point of the materials, generating no thermal impact on the internal separator or electrolyte. This builds safety directly into the manufacturing process.
No surface preparation required: The process works directly on aluminum and copper surfaces with their natural oxide layers—no pre-cleaning or chemical treatment needed, reducing process steps.
Consumable-free operation: No solder wire, flux, shielding gas, or other auxiliary materials are required. The process produces no spatter or fumes, keeping the internal cell environment clean.
Consistent weld quality: Digital control over welding parameters (power, time, and pressure) ensures high repeatability from one weld to the next, with low contact resistance and excellent electrical and thermal conductivity.
High-speed, automation-ready: Individual weld cycles typically complete in under 0.5 seconds, making the machine easy to integrate into automated production lines with robotic material handling.
System Components
The machine consists of five main components integrated into a standard cabinet: an ultrasonic generator, a transducer, a welding horn (sonotrode), an anvil (base tooling), and a pneumatic or servo-driven pressure system. The entire unit occupies approximately 1 to 2 square meters of floor space, with all welding parameters and monitoring functions controlled through a touchscreen interface.
Suitable Applications
The machine is well-suited for lap welding of various metal combinations, including aluminum-to-aluminum, copper-to-copper, and copper-to-aluminum—particularly excelling at the challenging task of joining dissimilar copper and aluminum materials. Common workpiece forms include stacked foils, sheets, busbars, and round wire terminals.
Value Proposition
For battery manufacturers, the ultrasonic battery welding machine delivers one core benefit: a reliable, high-strength, low-resistance electrical connection achieved with no thermal damage to the cell, no consumable costs, and fast cycle times. It addresses the critical joining requirements inside the cell and is a key process enabler for improving both safety and consistency in battery production. The technology has been extensively validated in high-volume production lines for both automotive power batteries and consumer electronics batteries, making it a proven, standard solution for mass manufacturing.
