Precision Metal Bipolar Plate with Custom Flow Field Design
What Is an Etched Bipolar Plate?
An etched bipolar plate is a precision metal flow field plate manufactured by photo chemical etching. It is used to distribute reactant gases, water and other fluids through precisely designed flow channels in fuel cells and electrolyzers.
Xinhaisen provides custom etched bipolar plates and flow field plates for PEM fuel cells, PEM electrolyzers and hydrogen energy applications. Flow field geometry, channel patterns, gas inlet and outlet holes, manifolds and mounting features can be manufactured according to customer drawings or engineering requirements.
What is Chemical Etching?
Chemical etching (also known as photochemical machining) is a subtractive manufacturing process that uses chemical solutions to dissolve metal precisely. Unlike traditional stamping or machining, etching creates burr-free, stress-free plates without mechanical force. This allows for complex micro-flow channel designs, tight tolerances, and rapid prototyping, making it ideal for the intricate structures required in bipolar plates.
Product Features
| Precision Etching Accuracy |
Micro-channel widths down to 0.015mm with ±0.01mm uniformity tolerance, ensuring optimal gas distribution and water management |
| Complex Flow Field Patterns |
Capable of producing serpentine, parallel, interdigitated, pin-type, and custom hybrid flow field designs for specific electrochemical performance requirements |
| Burr-Free & Stress-Free Surface |
Non-contact chemical etching eliminates mechanical stress, burrs, and micro-cracks, protecting the sensitive membrane electrode assembly (MEA) |
| Material Versatility |
Extensive experience with 316L stainless steel, titanium (Grade 1/2), nickel alloys, and other corrosion-resistant conductive metals |
| Coating-Ready Finish |
Smooth, oxide-free etched surface ideal for subsequent conductive or protective coatings (gold, carbon, graphite, metal nitrides) |
| Double-Sided Etching |
Simultaneous anode and cathode flow field etching with precise alignment for stacked plate configurations |
| Rapid Prototyping to Mass Production |
Digital tooling eliminates expensive hard molds — design iterations in days, volume scaling without retooling |
| Tight Flatness Control |
Maintained flatness across the entire plate surface ensures reliable gasket sealing and low contact resistance |
- Custom flow field design
- Precision etched channels
- Fine holes and openings
- Burr-free or low-burr etched edges
- No mechanical cutting stress
- Suitable for thin metal sheets
- Repeatable production
- Prototype and mass production capability
- Custom dimensions and tolerances
- Multiple metal material options
Product Specifications
| Parameter |
Specification |
| Product Name |
Electrolyzer Bipolar Plate
|
| Material Options |
Stainless Steel (304, 316L), Titanium, Copper, Alloy |
| Material Thickness |
0.02 mm – 1.5 mm |
| Min. Line Width |
0.015 mm |
| Min. Aperture (Hole) |
0.03 mm |
| Dimensional Tolerance |
±0.03 mm (Uniformity) |
| Lead Time |
Fast prototyping (5-7 days); Mass production available |
| Surface Finish |
As etched, passivated, or custom surface treatment |
| MOQ |
Negotiable |
| Process |
Chemical Etching |
Note: Custom specifications are available upon request.
Our Advantages
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Rapid Turnaround: With an efficient production setup, we handle urgent orders and large-volume demands without compromising quality.
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Cost Efficiency: Our chemical etching process eliminates high tooling costs (no expensive hard tooling required), making it cost-effective for both prototyping and mass production.
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Expertise in Thin Metals: Specializing in thicknesses down to 0.5mm, we offer solutions for lightweight stack designs that maximize energy density.
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Quality Assurance: We ensure high uniformity across thousands of pieces, critical for stable stack performance.
Applications
Bipolar plates manufactured by Xinhaisen are suitable for:
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Proton Exchange Membrane Fuel Cells (PEMFC): Used in automotive (cars, trucks), drones, and stationary power systems.
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Water Electrolyzers: For green hydrogen production.
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Portable Power Systems: Compact, high-efficiency energy devices.
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Aerospace & Aviation: Lightweight components for air mobility.
- PEM fuel cells
- PEM electrolyzers
- Hydrogen electrolyzer stacks
- Fuel cell stacks
- Hydrogen energy systems
- Water electrolysis systems
- Laboratory fuel cell systems
- Electrochemical testing equipment
- Customized electrochemical flow field applications
FAQ
- Q: What materials do you recommend for bipolar plates?
A: We typically recommend Stainless Steel (316L) for its excellent corrosion resistance and cost-effectiveness, or Titanium for applications requiring higher strength-to-weight ratios.
- Q: Can you achieve the tight tolerances required for sealing?
A: Yes. Our etching process maintains a uniformity of ±0.01mm, ensuring that the plates mate perfectly with gaskets to prevent gas leakage.
- Q: Do you charge high tooling fees for custom designs?
A: No. One of the major benefits of chemical etching is the low tooling cost. We use digital tooling, allowing us to adjust flow field designs quickly without expensive physical molds.
- Q: What is the lead time for a prototype?
A: Typically, prototypes can be delivered within 5 to 7 days after design confirmation.
- Q: Can you handle large-scale production?
A: Absolutely. We are equipped to handle massive, high-volume orders while maintaining strict consistency across all plates.
OEM & Custom Design Services
We work directly with your engineering team to optimize flow field designs for manufacturability. Simply provide your CAD file (DXF, DWG, STEP) or design specifications, and we deliver precision-etched bipolar plates tailored to your stack requirements. No minimum order quantity — we support R&D prototypes through to full-scale production.
Contact us today to discuss your bipolar plate requirements and receive a competitive quotation within 24 hours.
Welcome to contact us at any time!
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Precision Metal Bipolar Plate with Custom Flow Field Design Images
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