In lithium battery manufacturing, the laser welding station is where quality is made—or broken. Steel shells travel down the line, precisely positioned, as laser beams fuse components with micron-level accuracy. Yet too often, the result is not a perfect seal but a trail of rejects: porosity, pinholes, weak joints, and leaking cells that fail leak tests and end up in the scrap bin.
The root cause is frequently invisible to the naked eye: stamping oil residue left on the steel shell surface from the preceding forming operation.
During the deep-drawing and stamping process that shapes battery steel shells, heavy-duty stamping oils are applied to reduce friction and prevent tool wear. These oils are engineered to adhere tenaciously to metal surfaces—which is precisely what makes them so difficult to remove. When residual oil remains on the shell surface and enters the laser welding station, the intense heat vaporizes the oil, generating gas bubbles that become trapped in the solidifying weld pool. The result? Porosity, incomplete penetration, and seals that compromise battery safety and performance.
Conventional cleaning approaches each have fundamental limitations when it comes to stamping oil removal from battery steel shells:
Solvent dipping may soften surface oils but cannot physically dislodge oils that have been pressed into microscopic surface irregularities during the stamping process. Moreover, solvent residue itself can become a contaminant.
High-pressure spraying blasts the exterior surfaces but cannot reach the interior cavities, blind holes, or complex geometries that characterize many battery shell designs.
Strong acid soaking has been the default degreasing method in countless factories for decades—but it carries significant hidden costs: chemical expenses and hazardous waste disposal, worker safety risks from corrosive vapors, and metallurgical damage such as hydrogen embrittlement in high-strength steel components. Acid baths also fail to clean complex geometries uniformly, leaving oxide scale trapped in crevices.
Ultrasonic cleaning offers a fundamentally different approach. The technology relies on a physical phenomenon called cavitation. High-frequency sound waves generate millions of microscopic bubbles throughout the cleaning solution. When these bubbles implode, they release localized energy that reaches every surface—including internal cavities, blind holes, threads, and other hard-to-reach geometries.
For battery steel shells, this means:
Complete penetration into the shell interior and all formed features
Gentle yet thorough removal of stamping oils without damaging the substrate
No chemical aggression—the process is predominantly physical, eliminating the risks associated with strong acids
Consistent, repeatable results batch after batch
For over 20 years, Whale Cleen has focused on providing professional cleaning solutions and various types of ultrasonic cleaners. Operating from a 10,000-square-meter production base, the company designs and manufactures automatic ultrasonic cleaning machines, custom ultrasonic cleaning machines, and large industrial ultrasonic cleaning systems.
Whale Cleen offers a mechanical arm full automatic ultrasonic cleaning machine specifically designed for battery shell mold and component cleaning. This system consists of six integrated parts: mechanical transmission system, ultrasonic system, heating system, drying system, water supply and drainage system, and electrical control system—all governed by PLC control for easy operation.
The system automatically completes a full cleaning sequence: feeding → decarbonization → rinsing → ultrasonic rough washing → ultrasonic fine washing → ultrasonic rinsing → hot air drying → unloading. This one-stop processing of rough washing, rinsing, and drying eliminates the need for multiple separate machines and manual handling between stations.
Manual cleaning introduces inconsistency—different operators, different techniques, different results. Whale Cleen‘s fully automated systems remove this variability entirely:
PLC programmable control with touch color display for easy monitoring and operation
Single-arm servo manipulator that handles basket loading, transfer between tanks, and unloading—all with precision timing
Online monitoring that allows process parameters to be adjusted through the man-machine interface
The result is consistent cleanliness, every cycle, every shift.
Battery steel shells come in many shapes and sizes—cylindrical, prismatic, pouch-format—each with unique cleaning challenges. Whale Cleen supports non-standard customization, providing design drawings and cleaning programs tailored to specific part geometries and production requirements. Whether your shells have deep draws, internal features, or specific material sensitivities, the system is engineered to match.
Whale Cleen‘s ultrasonic technology replaces chemical aggression with mechanical precision. The cavitation process removes grease and stamping oils without exposing parts to harsh acids. The advantages are measurable:
No hydrogen embrittlement risk—ultrasonic cleaning entirely avoids the acid-metal reaction that produces diffusible hydrogen
Lower chemical costs and reduced hazardous waste disposal
Safer working conditions—no corrosive vapors, no specialized PPE requirements
No over-etching or dimensional changes—the substrate remains untouched
Battery manufacturing is a 24/7 operation, and cleaning equipment must keep pace. Whale Cleen systems are built for durability:
External stainless steel frame with dustproof outer packing and transparent observation windows
Photoelectric switches installed in the mechanical arm for precise positioning
All movable wires and signal wires protected by tank rails
18-month warranty with 12-hour response and 36-hour solution commitment
For battery manufacturers struggling with welding porosity and seal failures, the solution often lies not at the welding station itself—but at the cleaning station that precedes it. When stamping oil is thoroughly removed, laser welding proceeds without the gas evolution that causes porosity. Seals are sound. Leak test pass rates climb. Scrap rates fall.
Whale Cleen ultrasonic cleaning systems deliver the precision, consistency, and reliability that battery manufacturing demands—with over 20 years of experience, a 10,000-square-meter production base, and a commitment to non-standard customization.
Discover how Whale Cleen can eliminate stamping oil from your battery shell production line. Visit: http://www.bwhalesonic.com/
