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Prismatic Cell Steel Binding Band Welding Line
- Product description
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- Commodity name: Prismatic Cell Steel Binding Band Welding Line
The Steel Binding Band Tensioning & Laser Welding Line is a specialized automated solution for applying pre-tensioned steel strapping around prismatic cell stacks. By maintaining precise structural compression (up to 80 kN), this system prevents cell “breathing” and volumetric expansion during high-cycle energy storage applications, safeguarding pack longevity.
1. Equipment Overview
In the era of large-format 314Ah and 587Ah prismatic cells, mechanical management of “cell breathing” (volumetric expansion during charging) is as critical as thermal management. Without a highly precision-tensioned steel binding band, the sheer kinetic expansion force of 500Ah+ cells can easily fracture module casings and permanently damage busbar welds.
Huiyao Laser’s Steel Binding Band Welding Line replaces inaccurate manual banding tools with a fully closed-loop servo tensioning architecture. By applying mathematically exact clamping forces before firing the laser weld, the system ensures uniform pressure distribution across the entire cell stack interface. This mitigates internal resistance drift and extends the structural cycle life of the BESS by years.
2. Key Processes and Modules
2.1 Cell Stack Compression & Jigging
- Function: The pre-stacked cell assembly is loaded into a heavy-duty pneumatic compression stage. The stack is physically compressed to its pre-weld engineering dimension to ensure uniform thermal pad contact.
2.2 Closed-Loop Servo Tensioning
- Function: Servo motors grip the steel strap ends and apply exact tension force according to the recipe. Inline load cells provide microsecond feedback, correcting for material elongation before welding.
- Specifications:
- Tension Force Range: 5–80 kN (fully programable)
- Force Accuracy: ±2% of target value
- Material Support: Stainless steel, PET/steel composite bands
2.3 Laser Positioning & Welding
- Function: A high-power fiber laser welds the overlapped ends of the steel band. A laser displacement sensor guarantees the focal point remains perfectly sharp even against slight curvatures in the battery stack.
- Specifications:
- Laser Power: 1,500W - 3,000W
- Welding Pattern: Spot overlap, zig-zag, or custom galvo path
- Weld Strength: Base material yield strength maintained
2.4 Immediate Peel-Test / Strength Verification (Optional)
- Function: In-line non-destructive tension pull on the welded joint to verify structural integrity before clearing the station.
3. Production Line Specifications
Parameter
Specification
Applicable Products
Prismatic modules (314Ah, 587Ah, 628Ah)
Max Compression Force
Up to 80 kN
Band Width Support
10 mm – 40 mm
Weld Yield Rate
≥ 99.8%
Cycle Time
≤ 45s per module (depending on band count)
4. Frequently Asked Questions (FAQ)
Q: Can this machine handle the new 3-meter long LDES cell stacks?
A: Yes. The compression frame and clamping jigs are modular. We configure the stroke length and servo torque specifically for your pack design, easily accommodating extra-long Long Duration Energy Storage (LDES) formats.Q: Why use laser welding for the band instead of mechanical crimping?
A: Laser welding creates a permanent metallurgical bond with a significantly lower profile than a crimped seal. This saves critical millimeter space inside the ESS container and eliminates the risk of a crimp loosening under heavy thermal cycling.Q: Does the system record the tension force of every module?
A: Absolutely. Every specific tension curve (force over time) and the final holding point is logged into the MES against the module’s unique serial number for full EU Battery Passport traceability.
Key words:
Series of Products
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The Huiyao Laser Pneumatic Stacking & Pressing Machine is a high-precision, semi-automatic station designed for the flexible assembly of prismatic battery modules. It ensures optimal cell compression and alignment during the manual stacking process, which is critical for module durability, performance, and safety. This unit is ideal for R&D, prototyping, and small-batch production environments where process flexibility and precise pressure control are paramount.
Huiyao Laser is a leading battery laser welding machine manufacturer offering professional battery pack and battery module welding solutions for many fields, such as energy storage systems of research and development machines, as well as complete assembly lines for module and battery pack production.
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