Vanadium Flow Battery Grid Storage Patent Landscape
The vanadium flow battery grid storage space is a moderately concentrated growth-stage field, with Chinese institutions and a handful of Western challengers together controlling the leading positions; China is the dominant filing jurisdiction by a wide margin. The field has expanded substantially on a multi-year basis, though annual volume has eased from its 2017 peak and the most recent filing years remain understated by publication lag.
Two Chinese institutions share the top rank; the field is moderately concentrated
Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences are tied at the top of the applicant ranking, each with 34 patent records. HydraRedox Tech Holdings sits in third place with 17 patent records, and Dalian Rongke Power holds fourth with 14.
The top five filers account for 33% of the combined total across the hundred largest filers. That figure reflects moderate concentration: there is a clear leading pair, but a sizable mid-tier of challengers — Storion Energy, Lotte Chemical, and several Chinese regional players — prevents any single actor from dominating.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Beijing Zhongkaihongde Technology Co., Ltd. | 34 | |
| 2 | Institute of Process Engineering, Chinese Academy of Sciences | 34 | |
| 3 | HydraRedox Tech Holdings | 17 | |
| 4 | Dalian Rongke Power Co., Ltd. | 14 | |
| 5 | Storion Energy LLC | 12 | |
| 6 | Lotte Chemical Corporation | 12 | |
| 7 | Suzhou Rongke Power Co., Ltd. | 8 | |
| 8 | Imergy Power Systems | 8 | |
| 9 | VRB Energy Inc. | 8 | |
| 10 | JD Holdings Inc. | 8 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Guizhou Zhixi Technology Co., Ltd. | 8 | |
| 12 | Largo Clean Energy Corp. | 7 | |
| 13 | LG Chem Ltd. | 7 | |
| 14 | Shanxi Guorun Energy Storage Technology Co., Ltd. | 6 | |
| 15 | Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 5 | |
| 16 | Atomic Energy Council, Institute of Nuclear Energy Research (Taiwan) | 5 | |
| 17 | Liva Power Management Systems GmbH | 5 | |
| 18 | Toray Advanced Materials Korea Inc. | 5 | |
| 19 | Shanghai Electric (Anhui) Energy Storage Technology Co., Ltd. | 5 | |
| 20 | Shanghai Electric Lingstorage Technology Co., Ltd. | 4 |
The joint leadership of an applied-research institute and a commercial technology company in the same position suggests that technology development in this field remains tightly coupled to academic and state-affiliated China, which is a structural feature that new entrants must account for when mapping freedom-to-operate or partnership strategies.
Filing counts for 2024 and 2025 are understated due to standard patent publication lag; apparent softness in those years should not be read as a slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth with a dominant electrochemical-cell core and sparse adjacent branches
The annual filing trend reveals a field that has grown substantially across a multi-year window, while technology composition shows that activity is overwhelmingly concentrated in battery and fuel-cell chemistry, leaving grid-integration and process-engineering branches comparatively thin.
Annual filing trend
Annual filings peaked in 2017, dipped through 2018–2019, then recovered through 2022–2023. The three-year recent window sits 93% above the prior three-year window, confirming multi-year growth. Counts for 2024 and 2025 are understated by publication lag and should not be interpreted as a sustained decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) accounts for the large majority of classified records, confirming that cell-level chemistry and stack engineering remain the central competitive arena. H02J (power supply and grid systems), C01G (compounds of other metals), and B01J (chemical and physical processes) are all present but at much lower volumes, marking them as adjacent rather than core battlegrounds.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
All-vanadium redox flow battery and operation meth…
An all-vanadium redox flow battery and an operation method thereof, which belong to the field of flow batteries. The all-vanadium redox flow battery comprises a positive electrode electrolyte and a negative electrode electrolyte. A total vanadium ratio of the positive electrode electrolyte and the negative electrode electrolyte is maintained at the… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Efficient energy storage systems using vanadium re… | 114 |
| 2 | Vanadium redox flow battery stack structure | 46 |
| 3 | Electrochemical balance in a vanadium flow battery | 35 |
| 4 | Method of manufacturing electrolyte for vanadium r… | 32 |
| 5 | 一种在线恢复全钒液流电池容量及效率的方法 | 28 |
| 6 | 通信用全钒液流电池系统 | 28 |
| 7 | Single capacity balancing in a redox flow battery | 27 |
| 8 | A method for producing vanadium electrolyte from s… | 25 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment
Four structural features — lifecycle stage, applicant concentration, collaboration patterns, and geographic spread — together define the risk-reward profile for new entrants and incumbents alike.
Growth stage with eased annual pace
The field is classified as Growth: the recent three-year filing window is 93% above the prior three-year window, confirming sustained expansion on a multi-year basis. Annual volume has, however, eased from its 2017 peak, suggesting the earliest-mover advantage phase has passed and competition is now shifting toward incremental improvement and system integration. New entrants face a field with established IP foundations but still-open adjacent branches.
Growth · eased from 2017 peakModerate concentration with an active mid-tier
The top five filers account for 33% of the hundred largest filers’ combined total, placing the field in a moderate concentration band rather than a tight oligopoly. A leading pair (Beijing Zhongkaihongde Tech and Institute of Process Engineering, CAS) holds equal top rank, while at least six additional applicants each hold eight or more patent records. This mid-tier depth means that cell-level chemistry IP is increasingly contested, and freedom-to-operate analysis is non-trivial across multiple assignees.
Moderate concentrationJoint-filing activity anchored by the top pair
The most active co-filing relationship — 34 jointly filed records — links Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences, which explains their tied ranking. Largo Clean Energy and Storion Energy have co-filed 4 records, representing the most active Western collaboration pair. Dalian Rongke Power co-files with State Grid Qinghai and two CPI Northeast entities, reflecting a utility-industry partnership model. Outside these clusters, co-filing activity is sparse.
CAS–industry co-filing dominantChina leads; US, Europe, and Korea are secondary markets
China is the dominant filing jurisdiction, followed by the United States, Europe (EPO), Australia, WIPO (PCT), and South Korea. The Australia and New Zealand presence — notable for a hardware-intensive energy technology — likely reflects VRB Energy and related entities’ historical domicile and commercialization activity. Japan holds only a small share, suggesting limited domestic Japanese origination despite the country’s energy-storage ambitions. India’s presence is modest but non-zero, consistent with emerging grid-storage procurement interest.
China-dominant; US/EU secondaryGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Beijing Zhongkaihongde Technology Co., Ltd. | Institute of Process Engineering, Chinese Academy of Sciences | 34 |
| Largo Clean Energy Corp. | Storion Energy LLC | 4 |
| Dalian Rongke Power Co., Ltd. | State Grid Qinghai Electric Power Company Electric Power Research Institute | 2 |
| Dalian Rongke Power Co., Ltd. | State Grid Qinghai Electric Power Company | 2 |
| Dalian Rongke Power Co., Ltd. | CPI Northeast Power Co., Ltd. | 1 |
| Dalian Rongke Power Co., Ltd. | CPI Northeast Energy Technology Co., Ltd. | 1 |
| Dalian Rongke Power Co., Ltd. | CPI Northeast New Energy Development Co., Ltd. | 1 |
| Guizhou Zhixi Technology Co., Ltd. | Huadian (Guizhou) New Energy Development Co., Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Top players by patent records: a joint academic-commercial leader and a growing Western challenger
The applicant ranking is led by a tightly coupled Chinese research-institute–commercial-company pair, with a Western newcomer emerging as the most active recent filer. Technology focus and momentum differ meaningfully between the two tiers.
Beijing Zhongkaihongde Tech & Institute of Process Engineering, CAS
Both entities hold 34 patent records and are linked by 34 co-filed records, indicating that their rankings are effectively a single joint program. Their technology focus spans H01M 8 (fuel-cell-type flow battery stacks), B01J 8 (chemical reactor and catalysis processes), and C01G 31 (vanadium compounds), reflecting a vertically integrated portfolio from electrolyte chemistry through cell engineering. No recent momentum figure is listed in the evidence, consistent with their position as established rather than newly accelerating filers.
patent records: 34 eachLargo Clean Energy Corp
Largo Clean Energy holds 7 patent records in the overall ranking but is the most active recent filer among tracked applicants, with 18 records in the recent window and a trajectory described as a new entrant — implying rapid acceleration from a near-zero prior base. Their technology focus covers H01M 8 (flow battery cells), C01G 31 (vanadium compounds), and notably B60L 58 (electric vehicle propulsion), suggesting they are exploring vanadium electrolyte applicability beyond stationary grid storage. Their co-filing with Storion Energy (4 joint records) indicates a partnership-based development model.
patent records: 7 (ranked); 18 recent| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Largo Clean Energy Corp. | 18 | ▲ new entrant |
| Dalian Rongke Power Co., Ltd. | 3 | ▲ new entrant |
| Guizhou Zhixi Technology Co., Ltd. | 3 | ▲ new entrant |
| Suzhou Rongke Power Co., Ltd. | 7 | ▲ new entrant |
Under-served branches adjacent to the dominant electrochemistry core
Several IPC classes sit at low filing volumes relative to the dominant H01M core, representing areas of relative sparsity. Two stand out for their plausible technical relevance and realistic entry paths for organizations with existing vanadium flow battery expertise.
H02J · Power supply and grid systems integration
H02J covers grid-tie control, energy management systems, and power-supply architectures — the interface layer between a vanadium flow battery and the broader grid. With only 19 patent records in this branch versus 340 in H01M, the integration and control layer is comparatively sparse. As utility-scale deployments scale up, grid-code compliance, state-of-charge balancing algorithms, and ancillary-service dispatch logic are likely to become differentiated IP; organizations with software or power-electronics capability have a realistic path to build positions here without conflicting heavily with the cell-chemistry incumbents.
Search this in Eureka →C01G · Vanadium compound synthesis and electrolyte chemistry
C01G (compounds of other metals, which includes vanadium-specific inorganic chemistry) shows only 14 patent records, despite electrolyte quality and vanadium sourcing being a well-known performance bottleneck. The top-cited patent ‘Method of manufacturing electrolyte for vanadium redox flow batteries’ (32 citations) and Largo Clean Energy’s focus on C01G 31 both signal that upstream electrolyte and precursor chemistry has commercial importance. The sparse filing count relative to its strategic relevance suggests that proprietary synthesis routes and purification processes remain an under-protected area, offering entry potential for chemistry-oriented players or vanadium miners moving downstream.
Search this in Eureka →How leading applicants differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 8 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | C01G 31 · Compounds of other metals | H01M 10 · Batteries, cells & fuel cells | H02J 3 · Power supply & grid systems |
|---|---|---|---|---|---|
| Institute of Process Engineering, Chinese Academy of Sciences | Strong · 34 | Absent | Emerging · 5 | Emerging · 1 | Absent |
| Beijing Zhongkaihongde Technology Co., Ltd. | Strong · 34 | Absent | Emerging · 5 | Emerging · 1 | Absent |
| Largo Clean Energy Corp. | Strong · 17 | Absent | Moderate · 7 | Absent | Absent |
| HydraRedox Tech Holdings | Strong · 13 | Moderate · 6 | Absent | Absent | Absent |
| Dalian Rongke Power Co., Ltd. | Strong · 14 | Absent | Absent | Absent | Absent |
| Lotte Chemical Corporation | Strong · 10 | Emerging · 1 | Absent | Absent | Absent |
| Suzhou Rongke Power Co., Ltd. | Strong · 8 | Absent | Absent | Emerging · 1 | Absent |
Frequently asked questions
The evidence covers 265 patent families in scope. China is the leading filing jurisdiction, followed by the United States, Europe (EPO), Australia, and WIPO PCT filings.
Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences are tied at the top with 34 patent records each — a figure that reflects their extensive co-filing relationship. HydraRedox Tech Holdings ranks third with 17 patent records, and Dalian Rongke Power holds fourth with 14.
The field is in a Growth lifecycle stage: recent three-year filings are 93% above the prior three-year window on a multi-year basis. Annual volume has, however, eased from its 2017 peak. Counts for 2024 and 2025 are further understated by publication lag and should not be read as a real decline.
China leads with 145 patent records, well ahead of the United States at 42 and Europe (EPO) at 41. Australia (26) and WIPO PCT (24) are also notable, likely linked to the historical activity of VRB Energy and related entities.
The most-cited work in the evidence is titled ‘Efficient energy storage systems using vanadium redox flow batteries’ with 114 citations, followed by ‘Vanadium redox flow battery stack structure’ at 46 citations and ‘Electrochemical balance in a vanadium flow battery’ at 35 citations. These citations point to foundational stack design and balancing methodology as the most-referenced technical foundations.
The most technically plausible under-served branches are H02J (grid integration and energy management, 19 patent records) and C01G (vanadium compound and electrolyte synthesis, 14 patent records). Both are sparse relative to the dominant H01M electrochemistry core, yet directly relevant to system deployment and upstream supply-chain differentiation.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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