Slot-Die Coating Head for Battery Electrode Coating

Product Specifications

Technical details and manufacturing context for Slot-Die Coating Head

Definition

The slot-die coating head is a critical component within lithium-ion battery electrode coating machines, responsible for precisely depositing electrode slurry (anode or cathode material mixed with binder and solvent) onto moving current collector foils (copper for anode, aluminum for cathode). It creates uniform wet film layers with precise thickness control, directly impacting battery performance characteristics like energy density and cycle life. The head is typically constructed from stainless steel (316L or equivalent) with hardened tool steel and ceramic coatings on wear surfaces, and PTFE seals. It is available in coating widths from 200 to 1200 mm, with wet film thickness ranges of 20 to 200 µm and a thickness tolerance of ±1 µm across the web width. The slot gap is adjustable from 0.1 to 2.0 mm to accommodate different slurry viscosities. Operating pressure ranges from 1.0 to 1.6 MPa, and operating temperature is 10 to 60°C. Surface roughness is Ra 0.2–0.4 µm, and the material is typically SUS304 or SUS316L (ASTM A240). Weight varies from 50 to 150 kg depending on width and options. Ingress protection is IP54–IP65 (IEC 60529). These parameters are reference ranges; actual values must be confirmed with the manufacturer for specific models and applications. The coating head is designed for integration into electrode coating lines, and its performance directly affects battery quality. Proper selection and maintenance are essential to achieve uniform coatings without defects such as streaks or pinholes. Verification of model-specific specifications and compliance with relevant standards should be conducted with the legal manufacturer or supplier.

Working Principle

Electrode slurry is pumped into the coating head's internal manifold and extruded through a narrow, precisely machined slot onto the moving substrate. The gap between the slot exit and substrate, combined with slurry viscosity and flow rate, determines coating thickness. The head maintains consistent pressure and flow to produce uniform coatings without defects like streaks or pinholes. The slot gap is adjustable to accommodate different slurry formulations, and the head's internal design ensures even distribution across the coating width. The operating pressure and temperature must be maintained within specified ranges to achieve consistent results. Proper alignment and gap control are critical for achieving the desired wet film thickness and uniformity.

Common Materials

Stainless steel (316L or equivalent), Hardened tool steel, Ceramic coatings (wear surfaces), PTFE seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coating Width	200–1200 mm	Customizable to line requirements
Coating Thickness Range	20–200 µm	Wet film thickness
Coating Thickness Tolerance	±1 µm	Across web width
Slot Gap	0.1–2.0 mm	Adjustable for viscosity
Operating Temperature	10–60 °C	Material properties degrade above 60°C
Surface Roughness	Ra 0.2–0.4 µm	Critical for uniform coating
Material	SUS304/SUS316L	Corrosion resistantASTM A240
Weight	50–150 kg	Depends on width and options
Ingress Protection	IP54–IP65	Protection against dust and water jetsIEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Manifold
Distributes slurry evenly across the width of the slot

Material: Stainless steel
Lip Plates Part
Forms the precision slot and controls coating bead formation

Material: Hardened tool steel with ceramic coating
Adjustment Mechanism
Allows precise control of slot gap and parallelism

Material: Stainless steel
Sealing System
Prevents slurry leakage while allowing lip movement

Material: PTFE and elastomers

Manufacturers of Slot-Die Coating Head

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Frequently Asked Questions

What is the typical coating width range for this slot-die coating head?

The coating width is customizable to line requirements and typically ranges from 200 to 1200 mm. The exact width must be specified based on the application and confirmed with the manufacturer.

What coating thickness can be achieved?

The wet film thickness range is 20 to 200 µm, with a thickness tolerance of ±1 µm across the web width. Actual achievable thickness depends on slurry properties and process conditions.

What materials are used in the construction?

The head is typically made of stainless steel (SUS304 or SUS316L) with hardened tool steel and ceramic coatings on wear surfaces, and PTFE seals. Material grades should be verified with the manufacturer for specific models.

What are the operating pressure and temperature limits?

The operating pressure range is 1.0 to 1.6 MPa, and the operating temperature range is 10 to 60°C. Exceeding these limits may affect performance and material integrity.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0.1-5 bar (typical), up to 10 bar (max)
flow rate:	0.1-100 mL/min per cm width
gap height:	50-500 μm (adjustable)
temperature:	20-80°C (operating), -10 to 120°C (material compatibility)
coating width:	50-500 mm (standard), custom up to 1500 mm
viscosity range:	100-10,000 cP
slurry concentration:	20-60% solids by weight

Slot-Die Coating Head

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Reliability & Engineering Risk Analysis

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