TiTime Bipolar Plates
TiTime Bipolar Plates for Water Electrolyzers: Product Overview
TiTime is a leading global supplier of high-performance bipolar plates for water electrolyzers, with fully independent intellectual property in both PEM (Proton Exchange Membrane) and alkaline (AEL) technologies. Leveraging advanced titanium processing, large-area precision stamping, and proprietary multi-layer coating systems, TiTime delivers bipolar plates that achieve class-leading electrical conductivity, corrosion resistance, and long-term durability. Our products are deployed in over 1.5 GW of installed electrolyzer capacity worldwide (as of November 2025), serving Tier-1 system integrators in China, Europe, North America, and the Middle East.
1. Alkaline Electrolyzer (AEL) Bipolar Plates
Alkaline electrolysis remains the most mature and cost-effective technology for large-scale green hydrogen production, with global installed capacity exceeding 2.5 GW in 2025 and continuing multi-GW annual additions, primarily driven by Chinese manufacturers.
A single-stack power has reached 10–20 MW in commercial projects, with system lifetimes of 90,000–120,000 hours and excellent tolerance to fluctuating renewable energy inputs.
Bipolar plates account for 25–35% of stack cost and are critical to achieving low cell voltage, high current density, and long-term stability in hot concentrated KOH (30–35 wt%, 90–120°C).
TiTime AEL Bipolar Plate Features
- Base material — Nickel-plated low-carbon steel or stainless steel
- Forming method — Precision cold stamping (world-class 12,000-ton press line)
- Maximum single-plate active area — >2.5 m² (1800 × 900 mm), globally largest monolithic plate, minimizing seals and internal resistance
- Coating system — Multi-layer composite nickel + proprietary Ni-Co-Mo-P / Ni-Fe-W nanocrystalline activation layer (80–150 μm total thickness, porosity <0.01%, adhesion >45 N)
- Unique stress-relief + in-situ activation process — Eliminates hydrogen embrittlement and coating delamination – proven >120,000 hours without degradation
Verified Performance (2025 commercial data)
- Contact resistance: <3 mΩ·cm² (new), <8 mΩ·cm² after 100,000 h (vs. industry average 15–25 mΩ·cm²)
- Corrosion rate: <3 μm/year in 35 wt% KOH at 120°C + high current shock (vs. industry 8–15 μm/year)
- Plate thickness: 0.8–1.5 mm, 40% lighter than traditional cast designs
- Mechanical strength: >250 MPa compressive, zero cracking after 120,000 h
- Stack performance: 5–10 MW commercial stacks routinely achieve <1.80 V/cell at 2.5–3.0 A/cm² (>76% LHV system efficiency)
Delivery Track Record
Cumulative >1.2 GW of alkaline bipolar plates shipped by November 2025, including multiple 100+ MW projects with Longi Hydrogen, Sungrow Power, SANY Hydrogen, Cockerill Jingli Hydrogen, and Thyssenkrupp Nucera. Fastest recorded delivery: 100 MW-equivalent plates shipped within 6 weeks of order.
2. PEM Electrolyzer Bipolar Plates
PEM electrolysis offers superior dynamic response, high current density (>3–5 A/cm²), and compatibility with fluctuating renewables, making it the preferred technology for premium applications and projects requiring pressurized output or compact footprint.
TiTime PEM Bipolar Plate Features
- Base material → Aerospace-grade pure titanium (ASTM Grade 1/2)
- Flow field forming → Ultra-precision chemical etching (±50 μm accuracy, minimum line width 0.15 mm) or large-format CNC
- Maximum plate size → 1500 × 900 mm
- Coating system → Fully in-house PVD/CVD multi-layer noble-metal or noble-metal/alloy systems (pure Pt, Pt/Ir, Pt/Ru, Pt/C gradient structures, 20 nm–3 μm controllable thickness, adhesion >40 N, uniformity >98%)
Verified Performance (2025 commercial data)
- Interfacial contact resistance: <5 mΩ·cm² (new), increase <15% after 40,000+ hours
- Corrosion current: <1 μA/cm² at 2.2 V vs. RHE, 90°C (validated >50,000 hours)
- Flow field pressure drop: 30% lower than industry average via CFD-optimized designs
- Plate thickness: 0.8–1.2 mm, 20–30% lighter than traditional solutions
- Mechanical reliability: >350 MPa compressive strength, >1 million bending fatigue cycles
Delivery Track Record
Cumulative >250 MW of PEM bipolar plates delivered by November 2025, deployed in leading MW-class and multi-MW systems worldwide. Strategic partnerships with top-3 global CCM and catalyst manufacturers enable complete “bipolar plate + flow-field optimization + coating” integrated solutions.
Why Global Leaders Choose TiTime
- Proven at scale → Total delivered capacity >1.5 GW across alkaline and PEM technologies
- Lowest total cost of ownership → Real-world data shows 3–7% higher system efficiency and 0.15–0.40 RMB/kg H₂ reduction in levelized cost
- Fastest time-to-market → Sample plates in 4 weeks, GW-scale annual capacity ready
- Full quality traceability → 100% automated inspection (He leak testing, ICR mapping, SEM/EDS/XPS coating analysis, ASTM accelerated lifetime testing)
