Zinc Flow Battery Patents: Who Leads, Where the Gaps Are 2026
Zinc-based and hybrid flow battery patents: concentration at the top, room at the edges
67.6% of all 222 records in scope sit with just five assignees, so most of the core dendrite, plating and shunt-protection claim space is already staked out by a small group. Annual filings peaked so far at 17 in 2020, dipped through 2021 to just 3, then climbed back to 12 by 2024 — a +300% swing over that three-year span. Read the 2025-2026 tail as incomplete rather than declining; the underlying filing activity for those years has not finished publishing.
- 1PRIMUS POWER CORP64
- 2BROMINE COMPOUNDS44
- 3INDUSTRIE DE NORA SPA19
- 4EPSILOR ELECTRIC FUEL13
- 5DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES10
See the full zinc based and hybrid flow systems analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about zinc-based and hybrid flow battery patents
Who holds the most patents in zinc-bromine and zinc-iron flow battery technology?
The dataset ranks 43 assignees across 222 records, with the leading filer holding 64 records — more than six times the fifth-place count of 10. The top 5 assignees together account for 67.6% of all records, and the top 10 reach 85.1%, so the field is concentrated at the top with a long tail of smaller filers below it. Anyone assessing competitive position in this space should look closely at that leading group before filing into core cell-architecture claims.
Is filing activity in zinc-based flow batteries increasing or slowing down?
Filings grew from 3 in 2021 to 12 in 2024, a +300% increase over that three-year span, indicating renewed commercial interest rather than a slowdown. The years 2025 and 2026 show lower counts in the raw data, but that reflects the roughly 18-month lag between filing and publication, not an actual drop in activity. 2020 remains the single highest year on record so far, at 17 filings.
What technical problems do these patents actually address?
The search underlying this dataset specifically targets records addressing dendrite formation, plating uniformity, stripping efficiency, complexing agents, depth of discharge, or shunt protection within zinc-bromine, zinc-iron and hybrid flow battery systems. These are the operating constraints that determine whether a zinc flow cell survives repeated deep-discharge cycling without shorting or losing capacity. Roughly 94% of records also carry an H01M battery-architecture classification, confirming the corpus is centred on cell and system design rather than adjacent materials science alone.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Zinc Based and Hybrid Flow Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.