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Lithium Battery & New Energy Precision Slitting Knife Supplier
Zero-Notch Carbide Electrode Slitting · EV Cell Manufacturing
Sureay Machinery manufactures tungsten carbide circular slitting knives for lithium-ion battery electrode foil processing — the critical upstream step in EV cell, energy storage, and consumer electronics battery manufacturing. Our knives achieve Ra ≤ 0.05μm mirror finish and ±0.001mm dimensional tolerance, meeting the zero-burr standard required by ISO Class 7 dry-room assembly environments.
From automotive-grade NMC cathode aluminium foil to ultra-thin 6μm copper anode foil, every Sureay battery slitting knife is manufactured from submicron WC-Co tungsten carbide, individually inspected on CMM, and supplied with full material traceability documentation for IATF 16949 EV supply chain qualification.
[ View Tooling Matrix ]
Engineered Product Range
Core Tooling Matrix.
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[ The Industry Challenge ]
One Burr. One Failed Cell.
A single micro-burr on electrode foil penetrates the separator membrane, causing internal short-circuit and catastrophic cell failure. Standard slitter knives cannot hold the zero-notch Ra ≤ 0.05μm tolerance required by battery-grade aluminium and copper foil specifications.
[ Sureay Engineered Solution ]
Mirror Finish. Zero Contamination.
Sureay submicron WC-Co carbide knives are lapped to Ra ≤ 0.05μm and individually CMM-certified to ±0.001mm — delivering the zero-burr edge quality required for ISO Class 7 dry-room cell assembly (+8× edge life vs D2).
[ Verified Production Specs ]
Submicron≤ 0.5μm Grain Size
Application Engineering
Materials We Process.
Al Cathode Foil (12–20μm)
Cu Anode Foil (6–12μm)
PVDF Separator Film
OEM Custom Manufacturing
OEM Process From Drawing To Delivery
Get In TouchA custom blade order moves through four clear steps — so you know what to send, what we confirm, and what gets checked before shipment.
Send Drawing Or Sample
Send your drawing, used sample, machine model, or key dimensions. We review the application, blade geometry, material being cut, and any known fit or wear issues from your current supplier.
Engineering Review
Our engineers confirm steel grade, heat treatment direction, tolerance target, edge profile, and all OEM-fit details. Any open questions are resolved before quotation or production approval is issued.
Machining And Hardening
The blade moves into CNC machining, vacuum heat treatment, and precision grinding in a controlled sequence. Each stage is tracked against the approved specification to prevent distortion and geometry drift.
Inspection And Shipment
Final dimensions, hardness, and edge condition are verified against specification before dispatch. The order is packed and shipped with the required inspection records, and material certification documents.
Send Drawing Or Sample
Send your drawing, used sample, machine model, or key dimensions. We review the application, blade geometry, material being cut, and any known fit or wear issues from your current supplier.
Engineering Review
Our engineers confirm steel grade, heat treatment direction, tolerance target, edge profile, and all OEM-fit details. Any open questions are resolved before quotation or production approval is issued.
Machining And Hardening
The blade moves into CNC machining, vacuum heat treatment, and precision grinding in a controlled sequence. Each stage is tracked against the approved specification to prevent distortion and geometry drift.
Inspection And Shipment
Final dimensions, hardness, and edge condition are verified against specification before dispatch. The order is packed and shipped with the required inspection records, and material certification documents.
Reach Our Team
Get in Touch with Our Engineers
Contact Our Team
Discuss your requirements directly with our engineers.
Request a Quote
Our engineering team responds within 24 hours.
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