Liquid Hydrogen Storage Tank Technology — PatSnap Eureka
Liquid Hydrogen Storage Tank Technology: Patent & Innovation Intelligence
The global hydrogen economy depends on highly engineered cryogenic systems operating near 20 K. This intelligence report maps the competitive LH2 storage tank landscape — from foundational designs to 2025 frontier filings — across aviation, maritime, rail, and stationary energy sectors.
Four Interlocking Engineering Challenges Define the LH2 Tank Design Space
Liquid hydrogen storage tanks must simultaneously address structural integrity under cryogenic stress, thermal insulation to suppress boil-off gas (BOG), management of self-pressurization during quiescent storage, and safe venting or recapture of leaked hydrogen. These challenges are not independent — solutions to one directly constrain the others, driving the multi-disciplinary innovation clusters visible in the PatSnap Eureka patent dataset.
The dominant technical sub-domains within this dataset are: cryogenic tank architecture (double-wall, vacuum-insulated systems with multi-layer insulation and vapor-cooled shields), composite and laminate wall construction (CFRP and heterogeneous material combinations for mass reduction), thermal management and boil-off modeling (CFD, lumped-element thermodynamic models, and sloshing analysis), and leak detection and structural health monitoring (embedded metallic fiber sensors and hydrogen-porous layer architectures).
Interest is intensifying across aviation, maritime, rail, and large-scale stationary energy sectors as decarbonization imperatives accelerate. According to the International Energy Agency, hydrogen is central to net-zero pathways, with liquid storage enabling the highest energy density per unit volume among practical storage methods. The International Renewable Energy Agency similarly identifies LH2 as a priority vector for long-distance hydrogen trade and maritime transport.
The PatSnap Analytics platform enables R&D teams to map this evolving landscape, track assignee clusters, and identify freedom-to-operate risks before committing to design directions.
Key Innovation Approaches in Liquid Hydrogen Tank Design
Four distinct engineering clusters capture the majority of patent and research activity in the LH2 tank dataset, each targeting a different dimension of the cryogenic storage problem.
Double-Wall Cryogenic Tank Systems with Multi-Layer Insulation
The predominant approach for bulk LH2 storage employs concentric inner and outer tanks separated by a high-vacuum annular space packed with MLI (aluminized Mylar blankets), perlite, or hollow glass microspheres. A vapor-cooled shield (VCS) or liquid-nitrogen-cooled shield intercepts parasitic heat flux before it reaches the LH2 volume. Research from Shanghai Marine Diesel Engine Research Institute (2023) on a 4,000 m³ LH2 spherical tank found that MLI achieved a daily evaporation rate of only 2.05×10⁻³% at 1.34 Pa, outperforming HGMs and uninsulated vacuum configurations. This architecture dominates large-scale stationary and maritime applications.
MLI outperforms all alternatives at 4,000 m³+ scaleComposite Laminate and Heterogeneous-Material Tank Walls
Driven by mass constraints in aviation and high-power mobile platforms, this cluster deploys carbon-fiber composite overwraps, pin-connected laminate shells, and mixed metal/composite architectures. Rolls-Royce's 2024 EP patent connects inner and outer laminate shells via a pin array, enabling thinner and lighter shells than prior art while maintaining structural integrity. Beomhan Mechatech (KR, 2025) combines a metal inner tank (cryogenic compatibility) with a composite outer tank (structural efficiency) and an interposed insulating member, specifically optimized for BOG reduction.
Rolls-Royce EP 2024 · Beomhan KR 2025Thermal Modeling and Boil-Off Management
A substantial body of work applies CFD, lumped-element modeling, and sloshing simulation to predict and control pressure build-up and BOG evolution. Washington State University's 2023 study modeled tank size effects on self-pressurization and constant-pressure venting, finding that larger tanks (lower surface-area-to-volume ratio) exhibit slower pressurization rates. Kobe University's sloshing simulation of a 2,000-liter LH2 transport tank using ANSYS CFX (2015) provided early validation data. Korea Automotive Technology Institute (2023) used 3D CFD to optimize insulation thickness in a small-scale liquefier tank, validating against experimental data.
Larger tanks → slower pressurization (WSU, 2023)Structural Health Monitoring and Leak Detection Integration
An emerging and patent-active sub-domain embeds sensing capability directly into the tank wall to detect hydrogen permeation, structural degradation, and leakage location without taking the vessel out of service. Rolls-Royce filed two closely related EP patents in 2023–2024: one using metallic fibers susceptible to hydrogen embrittlement whose electrical resistance is measured to localize leaks, and another using a hydrogen-porous inner layer and a hydrogen-non-porous outer layer with a vent port to collect and re-use leaked gas. Kawasaki Heavy Industries' 2025 JP design method extends this to fatigue crack propagation analysis, ensuring initial defects do not propagate beyond half the wall thickness over the tank's operational life.
Embedded sensing · In-service leak localizationPatent Activity and Insulation Performance: Key Data Points
Visualising the assignee distribution and insulation performance data extracted from the PatSnap Eureka dataset to reveal where innovation is concentrated and where efficiency gains are greatest.
Active LH2 Tank Patents by Assignee (Dataset, 2022–2025)
Rolls-Royce PLC holds the largest cluster of active EP patents in this dataset with 3 filings, followed by single active filings from CNOOC (EP), Kawasaki (JP), and Beomhan Mechatech (KR).
Insulation System Performance in 4,000 m³ LH2 Spherical Tank
MLI (multi-layer insulation) at 1.34 Pa achieves a daily evaporation rate of only 2.05×10⁻³%, dramatically outperforming hollow glass microspheres and uninsulated vacuum configurations (Shanghai Marine Diesel Engine Research Institute, 2023).
LH2 Tank Innovation Timeline: Filing Activity by Era (2004–2025)
Patent and literature activity spans from early hybrid storage concepts (2004–2006) through a concentrated wave of aerospace- and maritime-oriented LH2 tank patents, with 2025 frontier filings from Japan and South Korea signalling active industrialization.
Where LH2 Tank Technology Is Being Deployed
Liquid hydrogen storage tanks are under active development across four major sectors, each with distinct engineering requirements, scale targets, and IP activity patterns.
Aviation
Cryogenic LH2 tanks are a primary design focus for hydrogen-powered aircraft, driven by the high gravimetric energy density of liquid hydrogen (~120 MJ/kg). The Leibniz Universität Hannover (2018) modeled cylindrical cryogenic tanks for blended-wing-body aircraft, incorporating geometrical, mechanical, and thermal constraints with mission profiles. Rolls-Royce's active EP patent portfolio (2023–2024) is explicitly targeted at aeronautical applications. The European Union Aviation Safety Agency is actively developing airworthiness frameworks for hydrogen-powered aircraft, making embedded leak detection a critical certification enabler.
Maritime
Multiple studies confirm LH2 as the preferred high-energy-density option for large long-range vessels. Cranfield University (2021) detailed a 280,000 m³ LH2 tanker design (vessel "JAMILA") using boil-off gas for propulsion. The University of Trieste (2022) reviewed LH2 in the maritime sector under EU Green Deal context. Kawasaki Heavy Industries' 2025 JP design method explicitly targets ship-mounted LH2 tanks and fatigue life under repeated thermal and mechanical cycling. Japan's national hydrogen strategy and the Suiso Frontier demonstration project trajectory underpin this activity.
Where LH2 Tank IP is Being Filed and Why
Within this dataset, the clearest concentration of patent activity in LH2 tank-specific filings is held by a small number of players across Europe, Japan, and South Korea.
| Assignee | Filings (in dataset) | Jurisdiction | Focus Area | Status |
|---|---|---|---|---|
| Rolls-Royce PLC | 3 active patents | EP | Composite/laminate LH2 & GH2 tanks, leak detection, aviation | Active |
| CNOOC Gas & Power Group | 1 active patent | EP | Large-scale stationary concrete LH2 tank | Active |
| Kawasaki Heavy Industries | 1 active patent | JP | Maritime LH2 tank design method, fatigue analysis | Active |
| Beomhan Mechatech Co., Ltd. | 1 active patent | KR | Heterogeneous-material LH2 tank for mobile use | Active |
| GFE Metalle und Materialien GmbH | 1 filing | DE | Metal alloy tank (early-stage materials) | Expired |
| KOKAN DRUM CO. LTD. | 1 filing | DE | Hybrid gas/liquid/solid storage (early concept) | Inactive |
Dominant in active filings, driven by Rolls-Royce (UK) and CNOOC's European filing strategy. EU Green Deal mandates are pulling investment. PatSnap life sciences solutions track adjacent cleantech sectors.
Kawasaki's 2025 filing reflects Japan's national hydrogen strategy and its LH2 maritime supply chain ambitions, aligned with the Suiso Frontier demonstration project trajectory.
Beomhan Mechatech's 2025 filing and substantial academic output from Korea Railroad Research Institute, Korea University, and Gachon University indicate a broad and deepening domestic ecosystem.
Run a Freedom-to-Operate Analysis on LH2 Tank IP
Identify conflicts with Rolls-Royce's EP cluster and other active assignees before committing to a design direction.
What the LH2 Tank IP Landscape Means for R&D and Innovation Strategy
Five strategic signals emerge from the patent and literature dataset, each with direct implications for R&D investment, IP filing, and market entry decisions.
Rolls-Royce Holds the Strongest Composite LH2 Tank IP Cluster
Rolls-Royce PLC holds the strongest visible IP position in composite LH2 tank systems within this dataset, with three active EP patents covering complementary aspects of structure, leak detection, and venting — creating a potential licensing moat for aviation and defense applications. R&D teams entering this space should conduct freedom-to-operate analysis against this cluster. The PatSnap customer base includes aerospace R&D teams already using Eureka for exactly this purpose.
FTO analysis recommended before design commitmentJapan and South Korea Are Racing Toward Maritime LH2 Industrialization
Kawasaki's 2025 design method patent and Beomhan Mechatech's 2025 heterogeneous tank patent, combined with both countries' national hydrogen strategies, signal that class-certified maritime LH2 tank products are approaching commercial readiness within 3–5 years. First-mover certification advantages will be significant. The International Maritime Organization is developing safety frameworks that will shape which designs reach commercial certification first.
Commercial readiness: 3–5 year horizonFive Forward-Looking Shifts in LH2 Tank Technology (2023–2025)
1. Maritime-scale fatigue-life engineering. Kawasaki Heavy Industries' 2025 JP filing introduces a formal design method based on fatigue crack propagation analysis — tracking initial defect growth across tank lifetime under cryogenic thermal cycling — a capability not present in earlier designs and essential for 30-year commercial vessel certification.
2. Heterogeneous-material hybrid tanks. Beomhan Mechatech's 2025 KR patent combining metal inner tanks with composite outer tanks represents a pragmatic engineering compromise: cryogenic-compatible metallic liner (aluminum or stainless steel) with structural mass efficiency of CFRP overwrap, and an engineered insulating interlayer to minimize BOG.
3. Infrastructure-scale concrete LH2 tanks. CNOOC's 2025 EP patent for a prestressed concrete outer tank with perlite/elastic felt insulation is structurally analogous to large LNG storage tanks and could dramatically reduce per-unit storage costs at hydrogen export terminals, echoing the historical cost trajectory of LNG infrastructure.
4. Embedded real-time structural health monitoring. Rolls-Royce's 2023–2024 EP patents embed electrically characterized metallic fibers and hydrogen-permeation layer stacks directly in composite tank walls, enabling continuous, in-service leak localization without scheduled shutdowns — a capability critical for airworthiness certification and maritime classification society approval.
5. High-fidelity CFD-guided insulation optimization. Korea Automotive Technology Institute's 2023 3D CFD work on insulation thickness trade-offs, and Shanghai Marine Diesel Engine Research Institute's 2023 optimization of VCS positioning in 4,000 m³ spherical tanks, both indicate that computational design is now the primary pathway for reducing BOG to commercially acceptable daily evaporation rates below 0.01%. PatSnap's chemicals and materials solutions support teams tracking adjacent cryogenic materials innovation.
Liquid Hydrogen Storage Tank Technology — Key Questions Answered
Liquid hydrogen storage tanks must simultaneously address four interlocking engineering challenges: structural integrity under cryogenic stress, thermal insulation to suppress boil-off gas (BOG), management of self-pressurization during quiescent storage, and safe venting or recapture of leaked hydrogen.
Research from Shanghai Marine Diesel Engine Research Institute (2023) on a 4,000 m³ LH2 spherical tank found that MLI (multi-layer insulation) achieved a daily evaporation rate of only 2.05×10⁻³% at 1.34 Pa, outperforming hollow glass microspheres (HGMs) and uninsulated vacuum configurations.
Rolls-Royce PLC holds the strongest visible IP position in composite LH2 tank systems within this dataset, with three active EP patents covering complementary aspects of structure, leak detection, and venting — creating a potential licensing moat for aviation and defense applications.
Washington State University's 2023 study modeled tank size effects on self-pressurization and constant-pressure venting, finding that larger tanks (lower surface-area-to-volume ratio) exhibit slower pressurization rates.
Certification and standards gaps are the primary near-term commercialization barrier. The dataset reveals extensive academic and prototype-level design activity but limited evidence of standardized testing protocols for LH2 tank cyclic fatigue, sloshing loads, and boil-off rate measurement at commercial scales.
Japan and South Korea are racing toward maritime LH2 industrialization. Kawasaki's 2025 design method patent and Beomhan Mechatech's 2025 heterogeneous tank patent, combined with both countries' national hydrogen strategies, signal that class-certified maritime LH2 tank products are approaching commercial readiness within 3–5 years.
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References
- Storage tank for liquid hydrogen — Rolls-Royce PLC, EP, 2024
- Large-scale ceiling structured low-pressure liquid hydrogen concrete storage tank — CNOOC Gas & Power Group, EP, 2025
- Multi-Structure Liquefied Hydrogen Storage Tank Using Heterogeneous Materials — Beomhan Mechatech Co., Ltd., KR, 2025
- Design method for liquefied hydrogen tanks — Kawasaki Heavy Industries, JP, 2025
- Composite storage tank for gaseous hydrogen — Rolls-Royce PLC, EP, 2023
- Hydrogen storage tank with leak management functionality — Rolls-Royce PLC, EP, 2024
- Design and Optimization of the Insulation Performance of a 4000 m³ Liquid Hydrogen Spherical Tank — Shanghai Marine Diesel Engine Research Institute, 2023
- The Effect of Liquid Hydrogen Tank Size on Self-Pressurization and Constant-Pressure Venting — Washington State University, 2023
- CFD Thermo-Hydraulic Evaluation of a Liquid Hydrogen Storage Tank with Different Insulation Thickness — Korea Automotive Technology Institute, 2023
- Review of the Liquid Hydrogen Storage Tank and Insulation System for the High-Power Locomotive — Korea Railroad Research Institute, 2022
- Simulation of Liquid Level, Temperature and Pressure Inside a 2000 Liter Liquid Hydrogen Tank During Truck Transportation — Kobe University, 2015
- A hydrogen fuelled LH2 tanker ship design — Cranfield University, 2021
- An Extensive Review of Liquid Hydrogen in Transportation with Focus on the Maritime Sector — University of Trieste, 2022
- Modelling and Designing Cryogenic Hydrogen Tanks for Future Aircraft Applications — Leibniz Universität Hannover, 2018
- Techno-Economic Analysis of Hydrogen Storage Technologies for Railway Engineering: A Review — University of Birmingham, 2022
- Large-scale stationary hydrogen storage via liquid organic hydrogen carriers — Australian National University, 2021
- An Overview of the Recent Advances in Composite Materials and Artificial Intelligence for Hydrogen Storage Vessels Design — UM6P (Morocco), 2023
- International Energy Agency (IEA) — Hydrogen
- International Renewable Energy Agency (IRENA) — Hydrogen
- International Maritime Organization (IMO) — Alternative Fuels
- European Union Aviation Safety Agency (EASA) — Hydrogen Aircraft
All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a targeted set of patent and literature records and represents a snapshot of innovation signals within this dataset only.
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