Grid-Scale Energy Storage Patent Landscape 2026
Grid-Scale Energy Storage Patent Landscape in 2026
Grid-scale energy storage is in an active growth phase, with the corpus expanding 85% over the recent filing window and activity concentrated among a relatively small set of specialist and research-institution filers. Form Energy leads the ranking, with electrochemical cell chemistry dominating the technology mix and China and the United States together accounting for the largest share of filing destinations.
Form Energy leads a field anchored by specialist innovators and universities
Form Energy holds the top position in ABB (Switzerland), the Regents of the University of California, and Ambri round out the top five.
The top five filers collectively hold 24% of the combined output of the hundred largest filers, indicating moderate-to-moderate-high concentration at the top tier but a substantial long tail of active participants. No single entity commands a dominant majority, which suggests the competitive landscape remains contestable.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Form Energy Inc | 119 | |
| 2 | Lockheed Martin Advanced Energy Storage LLC | 89 | |
| 3 | ABB (Switzerland) AG | 41 | |
| 4 | Regents of the University of California | 40 | |
| 5 | Ambri Inc | 39 | |
| 6 | Board of Trustees of the Leland Stanford Junior University | 36 | |
| 7 | University of Southern California | 28 | |
| 8 | Fluence Energy LLC | 26 | |
| 9 | LG Energy Solution Ltd | 25 | |
| 10 | Vehicle Energy Japan Inc | 23 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Eos Energy Technology Holdings LLC | 22 | |
| 12 | State Grid Corporation of China | 22 | |
| 13 | Zhou Xiwei | 22 | |
| 14 | China Electric Power Research Institute Co Ltd | 21 | |
| 15 | Ampcera Inc | 20 | |
| 16 | EnerVenue Holdings Ltd | 17 | |
| 17 | CMBlu Energy AG | 17 | |
| 18 | Topsoe Battery Materials A/S | 17 | |
| 19 | Huawei Digital Power Technologies Co Ltd | 17 | |
| 20 | FlexGen Power Systems LLC | 16 |
The presence of Stanford, USC, the University of California, and MIT among the leading filers signals that academic-origin IP remains strategically important — these institutions are likely licensing or spinning out technology rather than deploying it directly, making freedom-to-operate analysis around their portfolios a priority for commercial entrants.
Filing counts for the most recent 18–24 months are systematically under-reported due to patent publication lag; apparent slowdowns in 2025–2026 data should not be read as real demand contraction. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Sustained growth in filings with electrochemical cell chemistry as the dominant technical branch
The annual filing trend reveals consistent multi-year expansion, while the technology composition chart shows that battery and fuel-cell chemistry (H01M) accounts for the overwhelming majority of classified records, with grid integration and power systems (H02J) as the next most active branch.
Annual filing trend
Filings grew steadily from 87 records in 2017 to a peak of 358 in 2023, with 2024 at 341 and 2025–2026 figures heavily suppressed by publication lag — those years should be treated as floors, not final counts. The 85% growth over the recent window confirms that this remains an actively expanding field on a multi-year basis.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) dominates the composition by a wide margin, reflecting the electrochemical focus of grid-storage innovation. H02J (power supply and grid systems) is a clear secondary cluster, followed by G01R (measurement), A62C (fire-fighting and safety), and B60L (electric vehicle propulsion, reflecting shared platform work). Branches such as H02M (power conversion), H01G (capacitors), G06F (data processing), and C25B (electrolytic production) each represent smaller but technically distinct sub-fields.
↗ 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 controlling battery energy storage syst…
A method for controlling a battery energy storage system and a battery energy storage system including at least three battery energy storage units, a switching arrangement, and a control arrangement configured to select at least two battery energy storage units such that a sum of short circuit currents of the selected battery energy storage units is below a… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Cascade Redox Flow Battery Systems | 227 |
| 2 | Redox Flow Battery System for Distributed Energy S… | 204 |
| 3 | Quick charge battery with thermal management | 182 |
| 4 | Perfluorinated Membranes and Improved Electrolytes… | 172 |
| 5 | Quick charge battery with thermal management | 129 |
| 6 | System and method for optimizing efficiency and po… | 128 |
| 7 | 一种集装箱式锂离子电池储能系统的消防方法 | 118 |
| 8 | High rate, long cycle life battery electrode mater… | 116 |
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 strong multi-year growth, concentrated leadership, active university participation, and broad geographic filing reach defines the strategic context for new entrants and incumbents alike.
Growth stage with sustained multi-year expansion
The field is in a Growth lifecycle stage, with annual filings rising across the observation window and the overall corpus up 85% in the recent filing period. The 2023 peak of 358 records represents the highest single-year volume observed, and the multi-year trajectory remains upward. Entrants should expect intensifying prior-art density in core electrochemical classes while adjacent branches remain less crowded.
Growth stageModerate top-tier concentration with a long competitive tail
The top five filers account for 24% of the combined output of the hundred largest filers, and the gap between the leader (119 patent families) and the third-ranked filer (41 patent families) is significant. Below the top two, however, the ranking flattens quickly — over a dozen filers sit in the 20–40 family range — indicating that the field is not yet monopolized and that well-targeted portfolios can still establish meaningful positions.
Moderate concentrationUniversity-driven co-filing network anchors early-stage IP
The most active co-filing relationships observed are between the Regents of the University of California and Phsyical Sciences Inc (2 joint filings), between the Board of Trustees of the Leland Stanford Junior University and Nanjing University (2 joint filings), and between the Regents of the University of California and the San Diego State University Research Foundation (1 joint filing). These pairings reflect the academic-to-industry and international research-collaboration patterns that characterize early-stage electrochemical storage IP, and suggest that monitoring university technology-transfer pipelines is strategically relevant.
Academic-led co-filingChina and the United States are the two primary filing destinations
China leads all filing destinations, followed closely by the United States, with Europe (EPO) and WIPO (PCT) as significant secondary routes. India and Australia also appear as meaningful markets. Japan and South Korea — historically important battery-industry jurisdictions — show relatively modest filing counts here, which may reflect the specialist focus of the leading applicants rather than absent activity in those markets. A balanced China-US-EPO filing strategy appears to be the prevailing norm among serious participants.
China & US dominantGo 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 |
|---|---|---|
| Regents of the University of California | Physical Sciences Inc | 2 |
| Board of Trustees of the Leland Stanford Junior University | Nanjing University | 2 |
| Regents of the University of California | San Diego State University Research Foundation | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Form Energy and Lockheed Martin Advanced Energy Storage lead on volume; ABB is a recent-window entrant
Two specialist commercial filers hold a clear lead over the rest of the field. A second tier of institutional and industrial players clusters in the 20–41 patent family range, and several new entrants have appeared only in the recent filing window.
Form Energy Inc
Form Energy holds 119 patent families and is the clear volume leader. Its portfolio is concentrated in H01M subclasses covering battery electrode materials (H01M 4), metal-air and flow cell chemistries (H01M 12), and battery system operation (H01M 10) — a coherent deep focus on multi-day iron-air storage chemistry. Momentum is strongly positive at +48% in the recent filing period versus the prior window, indicating active portfolio expansion rather than maintenance filing.
119 patent familiesABB (Switzerland) AG
ABB (Switzerland) holds 41 patent families and is classified as a new entrant in the recent filing window — meaning its grid-storage portfolio has been built almost entirely in the current period, coming from a near-zero prior base. Its technical focus spans battery system management (H01M 10), EV and grid interface applications (B60L 3), and battery structural components (H01M 50), reflecting ABB’s grid-integration and power-systems heritage rather than cell-chemistry development. This positions ABB as a systems-level incumbent moving into storage-specific IP.
41 patent families| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Form Energy Inc | 65 | ▲ +48% |
| Ambri Inc | 6 | ▼ -40% |
| Regents of the University of California | 7 | ▼ -36% |
| ABB (Switzerland) AG | 11 | ▲ new entrant |
| Zhou Xiwei | 12 | ▲ new entrant |
| University of Southern California | 2 | ▲ new entrant |
Under-served branches adjacent to the dominant electrochemical core
Several IPC classes appear in the corpus at lower relative share, sitting adjacent to the dominant H01M cluster. These observations highlight technically plausible but less-contested areas; they are not validated commercial opportunities without further freedom-to-operate and market analysis.
H02M · Power Conversion (AC/DC)
Power conversion electronics (H02M) accounts for approximately 1% of classified records in this corpus despite being a critical enabler of grid-tied storage systems — every battery installation requires inverter and DC-DC conversion technology. The sparse filing count relative to H01M suggests that power-electronics innovators may be filing under adjacent topics or that this interface layer is underrepresented. For entrants with inverter or bidirectional converter expertise, this branch offers a plausible differentiation path with lower prior-art density than core cell chemistry.
Search this in Eureka →A62C · Fire-Fighting and Safety
Fire suppression and thermal-runaway mitigation (A62C) appears at roughly 3% of classified records, a share that is notable given that battery safety is a recognized deployment barrier for large-format grid storage installations. The top-cited patent in the corpus — a Chinese-language filing on containerized lithium-ion storage fire-fighting methods — confirms this is a real engineering concern. The relatively low filing density compared to electrochemistry branches suggests room for differentiated IP in detection, suppression, and containment systems specifically designed for grid-scale enclosures.
Search this in Eureka →How leading filers differ across technology routes
Strength of each leader across the main technology routes.
| Player | H01M 10 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | H01M 50 · Batteries, cells & fuel cells | H02J 7 · Power supply & grid systems | H01M 8 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Form Energy Inc | Strong · 53 | Strong · 102 | Emerging · 17 | Absent | Moderate · 41 |
| Lockheed Martin Advanced Energy Storage LLC | Absent | Strong · 56 | Absent | Absent | Strong · 51 |
| Ambri Inc | Strong · 32 | Strong · 38 | Strong · 25 | Absent | Absent |
| Board of Trustees of the Leland Stanford Junior University | Strong · 28 | Strong · 33 | Absent | Absent | Absent |
| ABB (Switzerland) AG | Strong · 38 | Absent | Moderate · 10 | Absent | Absent |
| Delft University of Technology | Strong · 23 | Strong · 24 | Absent | Absent | Absent |
| Zhou Xiwei | Strong · 26 | Absent | Absent | Strong · 16 | Absent |
Frequently asked questions
The corpus covers 2,057 patent families in scope globally. This represents the deduplicated family-level count used for landscape analysis; individual filing destinations and IPC classifications are counted at the patent-record level and can exceed this figure.
Form Energy Inc leads with 119 patent families, followed by Lockheed Martin Advanced Energy Storage LLC with 89 patent families. Both focus primarily on H01M electrochemical cell chemistry subclasses.
The field is in a Growth lifecycle stage. The corpus grew 85% in the recent filing window, with annual records rising from 87 in 2017 to a peak of 358 in 2023. Figures for 2025 and 2026 are heavily under-counted due to patent publication lag and should not be interpreted as a real decline.
China leads all filing destinations, followed by the United States, Europe (EPO), and WIPO (PCT). India and Australia are notable secondary markets. Japan and South Korea show comparatively modest counts in this corpus.
H01M (batteries, cells, and fuel cells) dominates the technology composition by a wide margin. H02J (power supply and grid systems) is the second most active branch, followed by G01R (electric and magnetic measurement) and A62C (fire-fighting and safety).
Yes. The Regents of the University of California (40 patent families), the Board of Trustees of the Leland Stanford Junior University (36), the University of Southern California (28), and MIT appear among the top-ranked filers. Their co-filing relationships with each other and with industry partners signal that technology-transfer pipelines from these institutions are a relevant IP-sourcing route.
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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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