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Current Collecting Plate of Cylindrical Cells Laser Welding Solution
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. It must simultaneously fulfill:
Low-resistance conduction. Ensure efficient current transfer from core tabs to battery terminals, minimizing electrical losses.
Structural support. Resist deformation during assembly (e.g., internal stress during casing insertion) and maintain welding zone planarity.
Thermal management. Reduce heat transfer to the separator during welding to prevent burn-through-induced short circuits.
Electrolyte infiltration. Accelerate electrolyte filling via through-holes or flow guide channels, enhancing electrode wetting efficiency.
Principles, Characteristics, and Advantages of Cylindrical Current Collector Laser Welding Technology
1. Basic Principles
Laser welding for cylindrical battery current collectors (e.g., 4680 cells) uses high-energy laser beams to melt and fuse the current collector disc with electrode tabs (foils). The core process involves:
Oscillating Welding Path: The laser beam moves along a preset path (e.g., sinusoidal or linear) while oscillating laterally at 120–300 Hz. This increases the welding area, reduces internal resistance, and minimizes heat concentration.
Dynamic Power Compensation: Laser power is adjusted in real time based on distance from the central path. For example, power decreases by up to 45% (from 100% to 55%) at oscillation extremes to stabilize energy input and prevent burn-through.
Shielding Gas Protection: Inert gases (e.g., argon) form a vortex barrier around the weld zone via tangential inlets, preventing oxidation and spatter.
2. Key Technical Features
2.1 Thermal Management
Reduced Heat-Affected Zone (HAZ): Short-wavelength lasers (e.g., 450nm blue or 1,064nm infrared) minimize heat diffusion. For copper collectors (absorption rate <5% at 1,064nm), single-mode annular beam lasers achieve 65% absorption, lowering power requirements by 84% and preventing foil perforation
Insulating Layers: Some designs integrate thermally conductive silicone beneath the collector to dissipate heat and isolate the separator
2.2 High-Speed Welding
Turret Flying Welding: Rotating turrets combined with galvanometers enable dynamic "flight welding" at speeds >300mm/s. Self-developed algorithms (e.g., high-precision dynamic compensation) correct trajectory deviations during rotation, maintaining ±0.05mm accuracy at 100°/s
Multi-Track Processing: Oscillation patterns (e.g., "sin wave") increase weld seam density without re-melting defects, cutting total welding time to 1.02s per collector
2.3 Beam Control Innovations
Single-Mode Annular Beams: These lasers feature independently adjustable core/ring beams (millisecond switching) for dual functions:
Core beam: Deep penetration (depth-to-width ratio >1:10) for thick copper collectors.
Ring beam: Preheating/surface treatment to reduce splatter
Power-Speed Synchronization: Algorithms like "4+1 motion-energy interpolation" synchronize laser power with velocity variations, especially at corners (R <5mm), eliminating voids or uneven seams
2.4 Structural Optimization
Louvered Collector Design: Collectors with through-holes allow electrode tabs to pass through and bend into an "L-shape" atop the disc. This positions the welding zone abovethe collector, reducing laser penetration depth by 60% and intercepting metal debris
Reinforced Ribs: Radial or circular ribs resist deformation during casing insertion, maintaining weld-zone flatness
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Importer,Exporter,Seller
Employee Number:
50~100
Ecer Certification：
Verified Supplier
HanWei Laser offers a range of laser systems, including desktop and handheld laser system models, that use advanced fiber, pulsed or continuous wave, blue laser, diode laser, hybrid laser technology to meet the exact needs of their customers. Also provide custom solutions for speciali...
HanWei Laser offers a range of laser systems, including desktop and handheld laser system models, that use advanced fiber, pulsed or continuous wave, blue laser, diode laser, hybrid laser technology to meet the exact needs of their customers. Also provide custom solutions for speciali...
