Laser welding machine for Current Collecting Plate for Cylindrical Cells

The current collector disc in cylindrical batteries (e.g., 4680 specification) is a critical conductive component connecting the core tabs to the battery casing/cap. Has a significant impact on battery performance. It must simultaneously fulfill:

1. Low-resistance conduction
   Ensure efficient current transfer from core tabs to battery terminals, minimizing electrical losses
2. Structural support
   Resist deformation during assembly (e.g., internal stress during casing insertion) and maintain welding zone planarit.
3. Thermal management
   Reduce heat transfer to the separator during welding to prevent burn-through-induced short circuits.
4. Electrolyte infiltration
   Accelerate electrolyte filling via through-holes or flow guide channels, enhancing electrode wetting efficiency

Welding is a critical process in current collector disc manufacturing, facing the following key issues:

1. Burn-through :
   Excessive heat input penetrates the thin collector disc, damaging structural integrity.
2. Weld deviation:
   Misalignment during high-speed welding compromises electrical conductivity and mechanical strength.
3. Thermal management :
   High welding temperatures risk thermal damage to the separator, potentially causing short circuits.
4. Structural deformation:
   Residual stress from welding or assembly pressure warps the disc, degrading welding zone planarity.
5. Weld reliability :
   Narrow process windows (e.g., for copper discs) increase risks of cold welds or brittle intermetallic compounds.

1. Black coating treatment :
   Enhances laser absorption efficiency by >30%, reducing heat input and burn-through risk.
2. Optimizing welding parameters:
   2-1. Laser power/pulse control to limit heat diffusion to the separator.
   2-2. Turret flying welding systems (e.g., Newlas' 200°/s high-speed welding) ensure precision under dynamic conditions.
3. Enhanced inspection:
   Real-time monitoring of lens contamination, power stability, and weld depth via closed-loop systems (e.g., Newlas' intelligent station compensation).
4. Structural reinforcement:
   Radial/circular ribs resist deformation during casing insertion.
5. Material optimization:
   Surface treatments (e.g., nickel plating) and thickness adjustments improve weldability.

HW-AMB-ECO laser welding technology achieves efficient, precise, and reliable welding results through its unique laser beam design and energy control. It is an advanced welding technology with broad application prospects :