VRFB Electrolyte Safety Patent Landscape 2026
The VRFB electrolyte safety space is highly concentrated, with the top five filers accounting for 68% of the hundred largest filers’ combined total, and two Chinese institutions sharing the leading position. The field is still expanding on a multi-year basis — recent-window growth at 120% versus the prior period — though annual volume has eased from its 2017 peak and the most recent years remain understated by publication lag.
A concentrated field co-led by two Chinese institutions
Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences share the top position in the applicant ranking, followed by Dalian Rongke Power in third place — all three are Chinese organizations.
The top five filers hold 68% of the hundred largest filers’ combined total, indicating a sharply concentrated competitive structure with a steep drop-off after the third tier. HydraRedox Tech Holdings and Storion Energy LLC represent the first non-Chinese names in the top five, signaling a modest but growing international presence.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Beijing Zhongkaihongde Technology Co., Ltd. | 22 | |
| 2 | Institute of Process Engineering, Chinese Academy of Sciences | 22 | |
| 3 | Dalian Rongke Power Co., Ltd. | 14 | |
| 4 | HydraRedox Tech Holdings | 7 | |
| 5 | Storion Energy LLC | 4 | |
| 6 | University of Limerick | 4 | |
| 7 | Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 3 | |
| 8 | VRB Energy Inc. | 3 | |
| 9 | Indian Institute of Technology | 2 | |
| 10 | Institute of Electronics Engineering, China Academy of Engineering Physics | 2 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | High Energy Batteries India | 2 | |
| 12 | CPI Northeast Power | 1 | |
| 13 | Guangdong Huanhua Hydrogen Energy Technology Co., Ltd. | 1 | |
| 14 | Tectonic Power Pte Ltd | 1 | |
| 15 | Xi’an Jiaotong University | 1 | |
| 16 | Lanzhou University of Technology | 1 | |
| 17 | Changzhou Xingchen New Energy Co., Ltd. | 1 | |
| 18 | Largo Clean Energy Corp. | 1 | |
| 19 | Zhengzhou Non-Ferrous Metals Research Institute Co., Ltd. of China | 1 | |
| 20 | CPI Northeast New Energy Development Co., Ltd. | 1 |
The dominance of two co-filing Chinese institutions at the top suggests a coordinated research program rather than purely independent competitive activity, which may create a defensible cluster of overlapping rights around core electrolyte safety methods.
The most recent 18–24 months of filing data are subject to publication lag and will appear more sparsely populated than earlier periods; the apparent softness in 2025–2026 should not be read as a real decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2017 filing peak followed by renewed activity in 2024–2025
The annual filing trend and IPC technology composition together reveal both the maturity trajectory of the field and the dominant technical routes being pursued by applicants.
Annual filing trend
Filings peaked sharply in 2017 then declined to low single digits through 2022. A meaningful rebound appeared in 2024 and 2025, consistent with the 120% recent-window growth figure; 2025 and 2026 totals are understated due to publication lag and should be interpreted with caution.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) dominates at 75% of IPC-tagged records, confirming that the bulk of activity is anchored in electrochemical cell design. B01J (chemical and physical processes) at 10% and C01G (compounds of other metals) at 8% represent the next largest branches, pointing to electrolyte formulation and vanadium compound chemistry as secondary axes of innovation.
↗ 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.
VANADIUM REDOX-DURCHFLUSSBATTERIE UND BETRIEBSVERF…
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 electrolyte and a negative electrolyte. A total vanadium ratio of the positive electrolyte and the negative electrolyte is maintained at the following ratio: positive electrolyte: negative… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 一种双功能负极及其作为全钒液流电池负极的应用 | 30 |
| 2 | 一种全钒液流电池及其运行方式 | 27 |
| 3 | Method for determining the state of charge of a va… | 25 |
| 4 | 一种消除全钒液流电池电解液杂质影响的方法 | 18 |
| 5 | ALL-VANADIUM REDOX FLOW BATTERY SYSTEM EMPLOYING A… | 14 |
| 6 | Method for determining the state of charge of a va… | 11 |
| 7 | 一种低温用全钒液流电池电解液及其制备方法 | 8 |
| 8 | 一种全钒液流电池及其运行方式 | 7 |
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 structure means for R&D investment decisions
The combination of high concentration, a research-institute-led top tier, and a clear technology-composition profile points to both entrenched incumbents and identifiable entry vectors.
Growth stage, but past its 2017 annual peak
The lifecycle stage is classified as Growth: recent three-year filings sit well above the prior three-year window, giving a 120% growth figure. However, annual volume has eased from the 2017 peak, so the field is expanding on a multi-year basis rather than accelerating year over year. New entrants such as Largo Clean Energy Corp are appearing, which is consistent with a field that still has room for differentiated positions.
Growth stageTop five hold 68% share among the hundred largest filers
The top five filers — Beijing Zhongkaihongde Tech, Institute of Process Engineering CAS, Dalian Rongke Power, HydraRedox Tech Holdings, and Storion Energy LLC — account for 68% of the hundred largest filers’ combined total. This leaves a long tail of smaller applicants each holding one to four patent records, suggesting that challenger positions exist but are thin. An entrant targeting differentiated electrolyte safety chemistry could avoid direct overlap with the leading cluster.
High concentrationOne dominant co-filing pair, limited broader ecosystem
The most active co-filing relationship is between Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences, with 22 jointly filed records — essentially all of their respective portfolios. A secondary pairing exists between Largo Clean Energy Corp and Storion Energy LLC with 2 co-filed records. Dalian Rongke Power co-files in small numbers with three state-linked power entities. Beyond these pairings, the collaboration network is sparse.
Limited ecosystemChina leads filings; Europe and Australia are next
China is the lead jurisdiction with 21 patent records. Europe (EPO) follows at 15, Australia at 10, and the United States at 9. India at 6 and Canada and New Zealand at 4 each reflect meaningful international prosecution ambitions from at least some applicants. The spread across English-language common-law jurisdictions suggests the non-Chinese filers are pursuing enforceability in export markets for grid-scale storage.
China-led, global reachGo 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 | 22 |
| Largo Clean Energy Corp. | Storion Energy LLC | 2 |
| Dalian Rongke Power Co., Ltd. | State Power Investment Corporation 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 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Top players differentiated by research focus and trajectory
The leading positions are held by two institutions filing jointly, with a commercial manufacturer in third place and a new Western entrant gaining momentum.
Beijing Zhongkaihongde Tech & Institute of Process Engineering CAS
Both entities share 22 patent records and appear to file exclusively together, making their combined program the single most significant cluster in the corpus. Their technology emphasis spans H01M 8 (electrochemical cell design), B01J 8, and B01J 14 (chemical process engineering), reflecting an integrated approach to electrolyte safety from cell architecture through to process chemistry. No momentum trend data is provided for these two entities beyond their current record count.
records: 22 eachLargo Clean Energy Corp
Largo Clean Energy Corp is flagged as a new entrant in the applicant momentum data, with recent filings marking its arrival in the corpus. Its technology focus covers H01M 8 (cell design) and C01G 31 (vanadium compounds), the latter indicating an interest in raw-material and precursor-level electrolyte safety — a route not heavily covered by the Chinese leaders. Its co-filing relationship with Storion Energy LLC suggests a coordinated commercial strategy.
records: 1| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Largo Clean Energy Corp. | 5 | ▲ new entrant |
Under-served technical branches adjacent to the dominant H01M core
Several IPC branches appear in the corpus at low record counts relative to the dominant H01M class, representing areas where patent density is sparse and technical differentiation may still be achievable.
C25B · Electrolytic production of compounds
C25B covers electrolytic synthesis routes that are directly relevant to producing high-purity vanadium electrolyte with controlled safety-relevant impurity profiles. With only 3 patent records in this branch, the area is sparsely covered. An entrant with expertise in electrochemical manufacturing could develop proprietary electrolyte-production processes that complement cell-level safety claims without colliding with the dominant H01M cluster. The entry path runs through process chemistry rather than cell design.
Search this in Eureka →B82Y · Nanotechnology applications
B82Y appears with only 2 patent records, associated with work from the Dalian Institute of Chemical Physics CAS. Nanomaterial additives — such as nanoparticle stabilizers or nano-structured separators — have been explored in academic literature as routes to improving electrolyte thermal stability and reducing crossover. The sparse patent coverage means that an applicant with nanomaterial expertise could potentially carve out a differentiated position, though commercial scalability of nanotech solutions in large-format flow batteries remains an open technical question.
Search this in Eureka →How leading applicants differ by technical route
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 8 · Batteries, cells & fuel cells | B01J 8 · Chemical/physical processes & catalysis | H01M 4 · Batteries, cells & fuel cells | C01G 31 · Compounds of other metals | B01J 14 · Chemical/physical processes & catalysis |
|---|---|---|---|---|---|
| Institute of Process Engineering, Chinese Academy of Sciences | Strong · 22 | Moderate · 8 | Absent | Emerging · 4 | Emerging · 4 |
| Beijing Zhongkaihongde Technology Co., Ltd. | Strong · 22 | Moderate · 8 | Absent | Emerging · 4 | Emerging · 4 |
| Dalian Rongke Power Co., Ltd. | Strong · 14 | Absent | Absent | Absent | Absent |
| Largo Clean Energy Corp. | Strong · 5 | Absent | Absent | Moderate · 2 | Absent |
| Dalian Institute of Chemical Physics, Chinese Academy of Sciences | Strong · 3 | Absent | Strong · 3 | Absent | Absent |
| University of Limerick | Strong · 4 | Absent | Absent | Absent | Absent |
| HydraRedox Tech Holdings | Strong · 4 | Absent | Absent | Absent | Absent |
Frequently asked questions
The evidence corpus contains 51 patent families in scope for VRFB electrolyte safety, providing a focused but actionable dataset for competitive analysis.
Beijing Zhongkaihongde Tech and the Institute of Process Engineering, Chinese Academy of Sciences jointly lead with 22 patent records each, followed by Dalian Rongke Power at 14 records. These three organizations are all Chinese entities.
The field is assessed as Growth stage: recent three-year filings are 120% above the prior three-year window. Annual volume has eased from its 2017 peak, so the expansion is on a multi-year basis rather than year-over-year acceleration. The most recent 2025–2026 figures are further understated by publication lag.
China leads at 21 patent records, followed by Europe (EPO) at 15, Australia at 10, and the United States at 9. India, Canada, and New Zealand each appear in the single digits, reflecting international prosecution by at least some applicants.
H01M (batteries, cells and fuel cells) accounts for 75% of IPC-tagged records, confirming that electrochemical cell design is the primary technical axis. B01J (chemical and physical processes) at 10% and C01G (compounds of other metals) at 8% are the next most represented branches.
The most significant co-filing relationship is between Beijing Zhongkaihongde Tech and the Institute of Process Engineering CAS, which share 22 jointly filed records. Largo Clean Energy Corp and Storion Energy LLC have 2 co-filed records. Dalian Rongke Power co-files in small numbers with three state-linked power entities. Beyond these pairs, the collaboration network is sparse.
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