Photo Chemical Micro-Etched Bipolar Plates for Hydrogen Fuel Cells & New Energy

Photo Chemical Micro-Etched Bipolar Plates for Hydrogen Fuel Cells & New Energy

Product Overview

Xinhaisen utilizes advanced photochemical machining to manufacture high-performance Bipolar Plates (BPPs) . As a critical part in proton-exchange membrane fuel cells (PEMFC) and electrolyzers, our bipolar plates facilitate even gas distribution, current conduction, and heat dissipation.Leveraging our expertise in precision etching, we produce ultra-thin metallic bipolar plates with complex flow field designs. Whether you are developing automotive fuel cells or stationary power systems, XinHaisen provides rapid prototyping and mass production capabilities with tolerances as tight as ±0.01mm.

What is Etching?

Unlike traditional stamping or CNC machining, the bipolar plates at Xinhaisen are manufactured using photochemical etching (also known as chemical milling).

This process involves:

• Material Preparation: Selecting high-grade metal coils (Stainless steel, Titanium, etc.).

• Lamination: Applying a UV-sensitive photoresist to the metal surface.

• Exposure: Using a photographic tool to transfer the flow field pattern onto the resist.

• Development: Washing away the unexposed resist to reveal the metal underneath.

• Etching: Spraying chemical solutions onto the metal to dissolve the exposed areas, creating precise channels and grooves.

• Stripping: Removing the remaining resist to reveal the finished bipolar plate.

Why Etching for Bipolar Plates?

• Burr-free & Stress-free: The chemical process leaves no burrs or mechanical stress, which is vital for the delicate membrane in a fuel cell stack.

• Design Flexibility: Complex flow field patterns can be modified without expensive hard tooling.

• Thin Material Capability: We can etch plates as thin as 0.5mm, contributing to stack compactness and weight reduction.

Product Features

• Ultra-High Precision: Achieve fine channel details with line widths down to 0.015mm and channel depth uniformity of ±0.03mm.

• Material Versatility: Expertise in etching Stainless Steel (304, 316L), Titanium, Nickel, and Copper alloys.

• Burr-Free Edges: Clean, chemically milled edges ensure safe handling and optimal contact with the Gas Diffusion Layer (GDL).

• Rapid Prototyping: Quick turnaround on design changes. Send us your CAD file, and we can produce samples in days.

• Scalability: Equipped to handle "mega-scale" orders, ensuring consistent quality from prototype to high-volume production.

Product Specifications

Applications

Our etched Bipolar Plates are widely used in the new energy and clean tech sectors:

• Proton Exchange Membrane Fuel Cells (PEMFC): For electric vehicles (FCEVs) and backup power units.

• Solid Oxide Fuel Cells (SOFC): High-temperature applications requiring specific material grades.

• Electrolyzers: For green hydrogen production.

• Micro Fuel Cells: For portable power applications.

• Redox Flow Batteries: As bipolar separators.

Why Choose Xinhaisen Bipolar Plates?

• 13+ Years of Etching Expertise: We don't just stamp metal; we specialize in chemical etching. Our process knowledge ensures your flow fields are accurate and reproducible.

• Cost-Effective Tooling: Unlike stamping dies that cost thousands, our etching tooling is photographic, making design iterations affordable.

• Material Integrity: We source high-grade materials to ensure corrosion resistance and electrical conductivity in harsh fuel cell environments.

• Global OEM Standards: We serve clients in the automotive, medical, and aerospace sectors, adhering to strict international quality standards.

FAQ

Q1: What materials do you recommend for PEM fuel cell bipolar plates?
A: For PEM applications, we typically recommend Stainless Steel 316L due to its excellent corrosion resistance and cost-effectiveness. For higher performance requirements, we also offer Titanium plates.

Q2: What is the minimum channel width you can achieve?
A: Our photochemical etching process allows us to achieve channel widths and web sections as small as 0.015mm on thin foils, and complex flow fields down to 0.10mm on standard plate thicknesses.

Q3: Do you offer coating services for the plates?
A: We specialize in the etching of the plates. However, we can coordinate with trusted partners to apply protective coatings (such as Gold, Graphite, or Metal Nitrides) to enhance conductivity and corrosion resistance upon customer request.

Q4: What file formats do you accept for custom designs?
A: We accept CAD files in .dwg, .dxf, .igs, and .step formats. Our engineering team will review the design for etchability and provide a feasibility report.

Q5: How quickly can I get a prototype?
A: Lead times vary by complexity, but generally, prototype tooling can be completed within 3-5 business days, with sample production shortly after approval.

Welcome to contact us at any time!