Vanadium Flow Battery Patent Landscape 2026
Vanadium Flow Battery Patent Landscape in 2026
The vanadium flow battery IP space spans 234 patent families and is led by a mixed field of energy-storage specialists, universities, and licensing entities, with annual filings having eased from a 2017 peak. The United States is the dominant filing jurisdiction, and core cell-chemistry work dominates the technology mix, leaving grid-integration and vehicle-propulsion branches comparatively under-served.
A moderately concentrated field with no single dominant force
JD Holdings leads the ranked applicants with 28 patent records, followed closely by Joby Aero Inc. (24) and Unisearch Ltd. (22), showing that no single organization commands a decisive share of the active corpus.
The top five filers account for 20% of the combined total among the hundred largest filers, indicating moderate rather than tight concentration — a structure that leaves meaningful space for challengers and new entrants to establish differentiated positions.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | JD Holdings Inc. | 28 | |
| 2 | Joby Aero Inc. | 24 | |
| 3 | Unisearch Ltd. | 22 | |
| 4 | Invinity Energy Systems (Canada) Corp. | 17 | |
| 5 | NewSouth Innovations Pty Ltd. | 17 | |
| 6 | Tohoku Techno Arch Co. Ltd. | 15 | |
| 7 | Massachusetts Institute of Technology | 13 | |
| 8 | VRB Power Systems Inc. | 13 | |
| 9 | Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 12 | |
| 10 | Tsinghua University | 12 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | VRB Energy Inc. | 12 | |
| 12 | 24M Technologies Inc. | 12 | |
| 13 | Case Western Reserve University | 11 | |
| 14 | Brother Kogyo KK | 11 | |
| 15 | Regents of the University of California | 11 | |
| 16 | Institute of Metal Research, Chinese Academy of Sciences | 11 | |
| 17 | Battelle Memorial Institute | 10 | |
| 18 | Raymond Ltd. | 9 | |
| 19 | Solvay SA | 8 | |
| 20 | Xuchang University | 8 |
The presence of universities (Tsinghua University, Case Western Reserve University, Massachusetts Institute of Technology) alongside commercial entities and licensing vehicles among the top ranks suggests that foundational IP is still being generated in academic settings, which typically precedes a new wave of commercialization.
Activity recorded in 2024 and 2025 is likely under-counted due to the standard 18–24 month publication lag; apparent softness in those years should not be read as a definitive trend. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual volume has eased from its 2017 peak; cell chemistry dominates the technology mix
The filing trend chart reveals a field that surged to a peak in 2017 and has moderated since, while the technology composition chart shows H01M (batteries, cells, and fuel cells) as the overwhelming primary branch with several adjacent classes at much lower densities.
Annual filing trend
Filings peaked at 46 in 2017, dropped sharply in 2018, partially recovered through 2020, and have trended lower since. Data for 2024 and 2025 are subject to publication lag and will likely revise upward; the apparent decline in those years should be interpreted with caution.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) accounts for the large majority of IPC classifications, reflecting that most patents address core electrochemical cell design and electrolyte chemistry. H02J (power supply and grid systems) and B60L (electric vehicle propulsion) are the next-largest branches but are far smaller, pointing to limited integration and application-layer coverage relative to the foundational cell work.
↗ 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 Battery
A vanadium redox battery is a battery capable of charging and discharging utilizing an oxidation-reduction reaction of vanadium as an active material. The vanadium redox battery includes a cathode and an anode. The vanadium redox battery includes an auxiliary electrode that is provided in at least one of the cathode and the anode. (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | High energy density redox flow device | 457 |
| 2 | High energy density redox flow device | 343 |
| 3 | All-vanadium redox battery | 297 |
| 4 | High energy density redox flow device | 236 |
| 5 | Redox flow battery system and cell stack | 235 |
| 6 | High energy density vanadium electrolyte solutions… | 219 |
| 7 | Stabilized vanadium electrolyte solutions for all-… | 192 |
| 8 | High energy density redox flow device | 185 |
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 patent structure means for R&D investment decisions
The combination of a past-peak filing curve, moderate concentration, active academic collaboration, and U. S.-centric prosecution reveals both the maturity risks and the geographic opportunities in this space.
Field is in decline phase; foundational IP is aging
The lifecycle evidence places vanadium flow battery patenting in a Decline stage, with annual filings easing back from the 2017 peak. Core cell-chemistry patents filed at peak years are approaching or past mid-life, meaning freedom-to-operate may be widening in some foundational areas while the most-cited high-energy-density redox flow device patents remain active references. R&D teams should audit expiry timelines before duplicating mature routes.
Lifecycle: DeclineModerate concentration leaves room for challengers
With the top five filers holding 20% of the hundred largest filers’ combined total, no single organization controls the agenda. The ranking is also split between commercial entities, academic institutions, and licensing vehicles, reducing the risk of a single-player bottleneck. Entrants with differentiated chemistry or systems-integration IP can realistically build a defensible position without facing an insurmountable head start.
Moderate concentrationTohoku Techno Arch / Brother Kogyo is the most active co-filing pair
The strongest co-applicant relationship in evidence is between Tohoku Techno Arch Co. Ltd. and Brother Kogyo KK, sharing 11 jointly filed records — notably the largest collaboration count by a wide margin. Tsinghua University and Chengde Wanlitong Industrial Group have co-filed 4 records, and Dalian Institute of Chemical Physics (Chinese Academy of Sciences) and Dalian Rongke Power Storage Technology Development have co-filed 3. These pairings reflect academic-industrial technology transfer in Japan and China as active channels worth monitoring.
Key co-filer pairsU.S. leads filings; China and Europe follow at significant scale
The United States is the leading prosecution jurisdiction with 162 patent records, followed by China (126) and Europe via EPO (86). WIPO PCT filings (66) and Australia (47) round out the top five, reflecting the global commercial ambitions of the major applicants. Canada (25) and Japan (24) show meaningful secondary activity. Organizations without U.S. and China coverage in their filing strategy risk leaving large commercial markets exposed.
U.S. dominant; CN & EP activeGo 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 |
|---|---|---|
| Tohoku Techno Arch Co. Ltd. | Brother Kogyo KK | 11 |
| Tsinghua University | Chengde Wanlitong Industrial Group Co. Ltd. | 4 |
| Dalian Institute of Chemical Physics, Chinese Academy of Sciences | Dalian Rongke Power Storage Technology Development Co. Ltd. | 3 |
| Avalon Battery (Canada) Corp. | Invinity Energy Systems (Canada) Corp. | 2 |
| 24M Technologies Inc. | Massachusetts Institute of Technology | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
JD Holdings leads on volume; Joby Aero emphasizes EV integration
The top two patent record holders occupy distinct technology profiles: JD Holdings concentrates on core cell and control-system IP, while Joby Aero’s portfolio leans heavily into electric vehicle propulsion alongside battery chemistry.
JD Holdings Inc.
JD Holdings leads the corpus with 28 patent records, concentrated in H01M 8 (fuel cell and flow battery structures), H01M 10 (secondary batteries), and G05F 1 (electric and magnetic variable control). The presence of control-system classifications alongside core cell chemistry suggests a portfolio that spans both hardware design and operational management of battery systems. Momentum data for this applicant is not broken out separately in the evidence.
patent records: 28Joby Aero Inc.
Joby Aero Inc. holds 24 patent records and is the only applicant with explicit momentum data: recent filings are down 79% versus the prior period, indicating a sharp reduction in activity. Its technology focus spans H01M 10 (secondary batteries), B60L 58 (battery management in electric vehicle propulsion), and B60L 50 (electric vehicle drive systems), pointing to an application-layer strategy linking energy storage to vehicle integration rather than pure cell chemistry.
patent records: 24| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Joby Aero Inc. | 4 | ▼ -79% |
Grid integration and electrolytic chemistry are under-served relative to core cell work
While H01M dominates the technology composition, several adjacent IPC branches show sparse coverage despite clear technical relevance to vanadium flow battery deployment — these represent areas of relative sparsity worth examining for R&D positioning.
H02J · Power supply and grid systems
This branch covers grid-connection architectures, energy management systems, and power conditioning — all critical for stationary vanadium flow battery installations. With 48 patent records against the dominant H01M volume of 634, grid-integration IP is sparse relative to the underlying cell chemistry it would serve. Organizations with expertise in power electronics or grid software could find this adjacency accessible without directly competing on core electrolyte or membrane chemistry.
Search this in Eureka →C25B · Electrolytic production of compounds
C25B covers electrolytic synthesis routes relevant to vanadium electrolyte preparation and regeneration — a process-chemistry angle with only 19 patent records in the corpus. As vanadium electrolyte cost and purity are recurring barriers to wider deployment, upstream electrolytic process IP could be strategically valuable. Entry here would require electrochemistry process expertise and is distinct from the cell-design work that dominates the landscape.
Search this in Eureka →How leading applicants differ by technology route
Strength of each leader across the main technology routes.
| Player | H01M 8 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | H01M 10 · Batteries, cells & fuel cells | H01M 50 · Batteries, cells & fuel cells | H01M 2 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Unisearch Ltd. | Strong · 40 | Strong · 25 | Strong · 24 | Absent | Absent |
| JD Holdings Inc. | Strong · 21 | Absent | Strong · 20 | Absent | Absent |
| Joby Aero Inc. | Absent | Absent | Strong · 24 | Strong · 15 | Absent |
| VRB Power Systems Inc. | Strong · 14 | Absent | Strong · 14 | Absent | Absent |
| Case Western Reserve University | Strong · 11 | Strong · 11 | Absent | Absent | Strong · 6 |
| Tohoku Techno Arch Co. Ltd. | Strong · 11 | Absent | Strong · 12 | Absent | Moderate · 3 |
Frequently asked questions
The corpus covers 234 patent families. Applicant rankings within this report are expressed in patent records, which can exceed the family count because a single family may be prosecuted across multiple jurisdictions.
JD Holdings Inc. leads the ranked applicants with 28 patent records, followed by Joby Aero Inc. with 24 and Unisearch Ltd. with 22.
The evidence places this field in a Decline stage, with annual filings easing back from a peak in 2017. The most recent two years of data are subject to publication lag and will likely revise upward.
The United States leads with 162 patent records, followed by China (126), Europe via EPO (86), WIPO PCT (66), and Australia (47). Canada and Japan also show notable secondary activity.
Tohoku Techno Arch Co. Ltd. and Brother Kogyo KK are the most active co-filers with 11 jointly filed records. Tsinghua University and Chengde Wanlitong Industrial Group have co-filed 4 records, and Dalian Institute of Chemical Physics (Chinese Academy of Sciences) and Dalian Rongke Power Storage Technology Development have co-filed 3.
H02J (power supply and grid systems) and C25B (electrolytic production of compounds) are notably sparse relative to the dominant H01M cell-chemistry branch, with 48 and 19 patent records respectively. These adjacencies cover grid integration and electrolyte production process IP — areas with plausible deployment relevance but limited current coverage.
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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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