VRFB MW-Scale Stack Scale-Up Patent Snapshot 2026
The MW-scale VRFB stack scale-up space is a small, highly concentrated niche dominated by Chinese institutions, with Dalian Rongke Power and the Dalian Institute of Chemical Physics together accounting for the large majority of filings. Annual volume peaked in 2020 and has eased since, signalling a field that is contracting from its earlier high rather than still expanding.
A handful of Chinese institutions dominate a compact, concentrated field
Dalian Rongke Power leads the ranked applicant list, followed closely by the Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Together these two organisations account for the vast majority of activity among the ranked applicants visible in this query.
The top five filers hold 69% of the combined total among the ranked applicants visible in this query, confirming an extremely tight concentration gradient. Outside these leaders, most other entrants hold only one or two patent records each, creating a pronounced two-tier structure.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Dalian Rongke Power Co., Ltd. | 10 | |
| 2 | Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 8 | |
| 3 | Indian Institute of Technology | 2 | |
| 4 | Korea Institute of Energy Research | 2 | |
| 5 | Anshan Lanling Jidian Protection Co., Ltd. | 2 | |
| 6 | Hunan Agricultural University | 2 | |
| 7 | Atomic Energy Council, Institute of Nuclear Energy Research (Taiwan) | 2 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 8 | Institute of Metal Research, Chinese Academy of Sciences | 2 | |
| 9 | Tectonic Power Pte Ltd | 1 | |
| 10 | Shenzhen Sinocredo New Energy Technology Co., Ltd. | 1 | |
| 11 | VRB Energy Inc. | 1 | |
| 12 | Hebei Jiantou Vanadiun Energy Storage Technology Co., Ltd. | 1 | |
| 13 | Hebei Vansheng Technology Co., Ltd. | 1 |
The dominance of Dalian-based entities — a developer and its affiliated research institute — indicates that scale-up know-how is anchored in a tightly coupled industry-academia partnership rather than distributed across a broad competitive field. New entrants from India, Korea, and Taiwan represent early-stage footholds rather than established positions.
Filings from the most recent 18–24 months are subject to publication lag and likely under-represent true recent activity; the apparent recent-period low should be interpreted cautiously. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2020 peak in annual filings and a technology mix anchored in cell and membrane chemistry
The filing trend chart tracks annual activity from 2017 to 2026, while the technology composition chart shows how IPC classes are distributed across the corpus.
Annual filing trend
Annual filings built from near-zero in 2017 to a peak of four records in 2020, then dropped to zero in 2021–2022 before a partial recovery in 2023 and 2025. The most recent data points (2024–2026) reflect publication lag and should not be read as a definitive floor. The overall trajectory confirms a field that peaked in 2020 and has not regained that level.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) is the visible IPC class by a wide margin, reflecting the core electrochemical stack focus. C08G (condensation polymers) is the second-largest branch, pointing to membrane and ionomer work as the principal adjacent discipline. Remaining classes — including C25B, C01G, and several smaller organic and polymer branches — each hold only a small share, indicating that areas such as electrolytic synthesis, metal compound chemistry, and polymer processing remain sparsely covered.
↗ 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.
Method for producing high-purity electrolyte for v…
The present invention relates to a method for producing a 3- to 3.5-valent vanadium solution from a 4-valent vanadium solution by a catalytic reaction in the presence of a reducing agent, which generates a gas product during oxidation; a method for producing an electrolyte for a vanadium redox flow battery; and an apparatus for producing a liquid… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 全钒液流电池用电极材料的制备方法 | 26 |
| 2 | Aromatic polymer ion exchange membranes, its compo… | 18 |
| 3 | 芳香族ポリマーイオン交換膜及びその複合膜の酸性電解液フローエネルギー貯蔵電池への応用 | 18 |
| 4 | 一种通过电解合成法制备全钒液流电池正极电解液的方法 | 6 |
| 5 | Method of Restoring Electrolyte of Vanadium Redox … | 5 |
| 6 | Aromatic polymer ion exchange membrane and its com… | 4 |
| 7 | Method for producing high-purity electrolyte for v… | 3 |
| 8 | 一种用于维护电解液高性能的全钒液流电池电解液配方及工艺 | 2 |
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.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
Dalian Rongke Power
Dalian Rongke Power leads the ranking with 10 patent records, focused primarily on H01M 8 (fuel cell and flow battery stack technology) and C08G 73 and C08G 61 (condensation polymer membrane chemistry). Its momentum data does not appear in the recent-entrant signals, indicating an established rather than rapidly accelerating position. As the commercial arm of the Dalian cluster, its portfolio spans both stack architecture and the membrane materials underpinning MW-scale operation.
patent records: 10Dalian Institute of Chemical Physics, CAS
The Dalian Institute of Chemical Physics, Chinese Academy of Sciences holds 8 patent records and shares a near-identical technology focus with Dalian Rongke Power across H01M 8 and C08G polymer classes, reflecting its role as the research originator in the partnership. Momentum data flags it as a new entrant in the most recent filing window, suggesting renewed publishing activity after a quiet interval. Its 8 co-filed records with Dalian Rongke Power are the largest single collaboration signal in the dataset.
patent records: 8Frequently asked questions
The corpus contains 15 patent families in scope. This is a compact niche relative to broader vanadium redox flow battery patenting, reflecting the specialised focus on megawatt-level stack engineering.
Dalian Rongke Power leads with 10 patent records, followed by the Dalian Institute of Chemical Physics, Chinese Academy of Sciences with 8 patent records. Both are based in Dalian, China, and co-file extensively with each other.
H01M (batteries, cells and fuel cells) is the overwhelmingly visible IPC class, reflecting the core electrochemical stack focus. C08G (condensation polymers) is the second-largest class, pointing to ion-exchange membrane chemistry as the principal adjacent discipline.
The lifecycle evidence places the field in a Decline stage. Annual filings peaked in 2020 at four records and have not returned to that level. The most recent data points remain subject to publication lag, but the multi-year trend indicates a contraction from the 2020 peak rather than continued growth.
China is the lead jurisdiction by patent record count, consistent with the dominance of Chinese filers. The United States is the second most-covered jurisdiction, followed by Europe (EPO) and India. Japan and Germany each hold smaller positions, indicating that visible assignees are seeking international protection beyond China.
C08J (polymer processing and solutions) and C25B (electrolytic production of compounds) are among the sparsest branches in the corpus, with only 1 and 4 patent records respectively. Both have plausible connections to MW-scale VRFB operation — membrane fabrication processing and electrolyte rebalancing — making them adjacent branches worth investigating for differentiated IP development.
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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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