Grid-Scale BESS Control Patent Landscape 2026
The grid-scale battery energy storage system (BESS) control space is heavily concentrated in Chinese state-owned and academic institutions, with State Grid Corporation of China holding the top position by a wide margin. Overall activity has grown substantially on a multi-year basis, reflecting accelerating deployment of grid-scale storage globally.
State Grid dominates a Chinese-led, moderately concentrated field
China Electric Power Research Institute with 49 and Shanghai Jiao Tong University with 25. The top tier is clearly Chinese, but a handful of Western players — Honeywell International, Fluence Energy, and ABB — appear in the top ten, indicating some international competitive presence.
The top five filers account for 23% of the hundred largest filers’ combined total, a moderate concentration level. The gap between the leader (78 patent families) and the fifth-ranked filer (17 patent families) is steep, suggesting a dominant first tier and a much shallower second tier.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | State Grid Corporation of China | 78 | |
| 2 | China Electric Power Research Institute Co., Ltd. | 49 | |
| 3 | Shanghai Jiao Tong University | 25 | |
| 4 | Honeywell International Inc. | 19 | |
| 5 | JD Holdings Inc. | 17 | |
| 6 | Zhou Xiwei | 17 | |
| 7 | State Grid Fujian Electric Power Co., Ltd. | 16 | |
| 8 | Huaneng Clean Energy Research Institute | 16 | |
| 9 | Fluence Energy LLC | 15 | |
| 10 | ABB Ltd. | 15 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Tsinghua University | 14 | |
| 12 | State Grid Fujian Electric Power Research Institute | 14 | |
| 13 | Electric Power Research Institute of China Southern Power Grid | 14 | |
| 14 | Shandong University | 14 | |
| 15 | State Grid Shanghai Municipal Electric Power Co. | 13 | |
| 16 | FlexGen Power Systems LLC | 12 | |
| 17 | Northeast Electric Power University | 11 | |
| 18 | SOUTHERN POWER GRID PEAK LOAD & FREQUENCY REGULATI… | 11 | |
| 19 | State Grid Jiangsu Electric Power Co., Ltd. Research Institute | 11 | |
| 20 | Huaneng Group Technology Innovation Center Co., Ltd. | 10 |
China Electric Power Research Institute, reflects a coordinated national IP strategy rather than purely commercial R&D competition. Western industrial players entering or expanding in this space face an established network of interlocking Chinese filings covering core grid-integration control methods.
Filing counts for 2025 and 2026 are substantially under-counted due to patent publication lag; the apparent softening in those years does not reflect actual filing activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Strong multi-year growth, with H02J power-grid systems overwhelmingly dominant
The annual filing trend and technology composition charts together reveal a field expanding rapidly over the observed window, concentrated almost entirely in power-system control methods rather than battery chemistry or power electronics.
Annual filing trend
Filings rose from 66 in 2017 to a recorded high of 161 in 2024, representing 96% growth in the recent window. The step-change in annual volume from 2021 onward is particularly notable. Figures for 2025 and 2026 are suppressed by publication lag and should not be read as a real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (Power supply and grid systems) accounts for the overwhelming majority of classified records, reflecting that BESS control research is primarily framed as a grid-integration problem. Secondary branches — H01M (batteries and fuel cells), G01R (electrical measurement), H02M (power conversion), and G06F/G06Q (digital and business data processing) — each represent only a small fraction of total records, signalling that adjacent technical disciplines remain comparatively under-served.
↗ 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 and apparatus for dynamic management and co…
The invention discloses method and apparatus for dynamic management and control of a lithium battery energy storage system and an electronic device. A battery management system (BMS) is configured to read a present operation data stream of each cell. A diagnosis apparatus is configured to extract a key battery parameter of said each cell from the present… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Battery energy storage power conditioning system | 271 |
| 2 | 基于主从策略的微网系统协调控制方法 | 125 |
| 3 | Battery energy storage system and control system a… | 120 |
| 4 | 一种基于电池储能系统的功率转换系统及其控制方法 | 112 |
| 5 | Battery energy storage system and control system a… | 110 |
| 6 | 一种基于负荷预测的电池储能系统削峰填谷实时控制方法 | 85 |
| 7 | Building and Building Cluster Energy Management an… | 83 |
| 8 | Hybrid power generation of wind-power generator an… | 74 |
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 competitive structure means for R&D investment decisions
Four structural features of this landscape — life-cycle stage, applicant concentration, collaboration networks, and geographic spread — each carry distinct implications for where and how a new entrant or incumbent should position its IP.
Active growth phase with no sign of saturation
The field is classified as Growth stage, with annual filings still rising and a 96% increase in the recent window. No peak-year plateau is evident in the pre-lag data. This means core control methods are still being actively defined, creating both risk (crowding) and opportunity (first-mover positions in emerging sub-topics remain available).
Growth stageSteep leader gap, shallow second tier
The top five filers hold 23% of the hundred largest filers’ combined total, with State Grid at 78 patent families well ahead of all others. The second tier — universities, provincial grid companies, and Western industrials — clusters between 10 and 25 patent families. This structure means the top position is entrenched, but the challenger tier is still open to disruption by focused R&D in under-covered sub-topics.
Moderate concentrationState Grid ecosystem dominates co-filing activity
The most active co-filing pair is State Grid Corporation of China with China Electric Power Research Institute, linked by 32 joint patent families. State Grid Fujian Electric Power and its provincial research institute share 14 jointly filed families. Huaneng Clean Energy Research Institute and Huaneng Group Technology Innovation Center co-filed 10 families. Western applicants show no comparable co-filing density, pointing to a structurally integrated Chinese consortium that Western players would need to match through their own partnership strategies.
Consortium-ledChina-centric filing with limited international protection
China accounts for 737 of total jurisdiction records, with the United States next at 142, followed by WIPO PCT at 60 and Europe at 57. India and South Korea are meaningful secondary markets. The heavy China weighting means most of this IP provides limited enforcement leverage outside China, and international filers have significant room to build exclusive positions in the US, European, and Asian markets.
China-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 |
|---|---|---|
| State Grid Corporation of China | China Electric Power Research Institute Co., Ltd. | 32 |
| State Grid Fujian Electric Power Co., Ltd. | State Grid Fujian Electric Power Research Institute | 14 |
| Huaneng Clean Energy Research Institute Co., Ltd. | Huaneng Group Technology Innovation Center Co., Ltd. | 10 |
| State Grid Corporation of China | State Grid Fujian Electric Power Research Institute | 8 |
| State Grid Corporation of China | State Grid Fujian Electric Power Co., Ltd. | 8 |
| China Electric Power Research Institute Co., Ltd. | State Grid Fujian Electric Power Research Institute | 6 |
| China Electric Power Research Institute Co., Ltd. | State Grid Fujian Electric Power Co., Ltd. | 6 |
| State Grid Corporation of China | State Grid Hunan Electric Power Co., Ltd. | 5 |
| Shanghai Jiao Tong University | Southern Power Grid Peak Load and Frequency Regulation Power Generation Co., Ltd. | 5 |
| Huaneng Clean Energy Research Institute Co., Ltd. | Geermu Age New Energy Power Generation Co., Ltd. | 5 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
State Grid and Honeywell represent contrasting strategic postures
The ranking is led by vertically integrated Chinese state entities whose IP is tightly focused on grid-system control methods, while the highest-momentum Western entrant — Honeywell — is building a smaller but AI-augmented portfolio.
State Grid Corporation of China
State Grid leads with 78 patent families, concentrated in H02J grid-system integration and power-supply control, with a secondary emphasis on H02J7 (battery charging and management within grid contexts). Recent momentum shows a trend of –31% in the most recent period versus prior, suggesting the pace of new filings has eased, though the absolute portfolio remains the largest in the field. Its co-filing network with China Electric Power Research Institute and provincial subsidiaries extends its effective IP perimeter well beyond its direct filings.
families: 78Honeywell International Inc
Honeywell holds 19 patent families and is flagged as a new entrant in the most recent filing window, with 13 recent families — the highest recent count among the momentum-tracked applicants. Its technology emphasis spans H02J7 and H02J3 grid control, with a notable secondary focus in G06N3 (AI-model-based computing), distinguishing its approach from the predominantly deterministic control methods of the Chinese leaders. This AI-augmented positioning makes Honeywell the most technically differentiated Western challenger currently visible in the ranking.
families: 19| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| State Grid Corporation of China | 11 | ▼ -31% |
| China Electric Power Research Institute Co., Ltd. | 8 | ▲ new entrant |
| Shanghai Jiao Tong University | 10 | ▲ new entrant |
| Huaneng Clean Energy Research Institute Co., Ltd. | 1 | ▼ -95% |
| Honeywell International Inc. | 13 | ▲ new entrant |
| Zhou Xiwei | 2 | ▼ -80% |
| State Grid Fujian Electric Power Co., Ltd. | 4 | ▲ new entrant |
| Tsinghua University | 3 | ▲ new entrant |
Under-served branches adjacent to the dominant H02J core
Several IPC classes appear at low share alongside the dominant H02J cluster, indicating technical areas where BESS control intersects with broader engineering domains but has attracted comparatively few dedicated filings.
G01R · Electric and Magnetic Measurement
G01R records represent only about 3% of total branch records in this corpus. Precise in-situ measurement of state-of-charge, state-of-health, and grid-side electrical parameters is a prerequisite for advanced BESS control algorithms, yet the patent volume here is sparse relative to the H02J core. An entrant with strong metrology or sensor-fusion capability could build a differentiated position by patenting measurement methods specifically designed for grid-scale dispatch and degradation management.
Search this in Eureka →H02M · Power Conversion (AC/DC)
H02M accounts for roughly 3% of branch records, despite power conversion hardware being central to every BESS interface with the AC grid. The low filing density suggests that most applicants are claiming control-layer methods in H02J without deeply protecting the underlying converter topologies and modulation schemes. For power electronics specialists, this represents a technically adjacent area where grid-scale BESS-specific converter control IP remains relatively open.
Search this in Eureka →How leading applicants differ by IPC technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H02J 3 · Power supply & grid systems | H02J 7 · Power supply & grid systems | H01M 10 · Batteries, cells & fuel cells | H02J 15 · Power supply & grid systems | H02J 13 · Power supply & grid systems |
|---|---|---|---|---|---|
| State Grid Corporation of China | Strong · 59 | Moderate · 21 | Absent | Emerging · 3 | Emerging · 3 |
| China Electric Power Research Institute Co., Ltd. | Strong · 36 | Strong · 23 | Absent | Emerging · 4 | Emerging · 3 |
| Shanghai Jiao Tong University | Strong · 18 | Strong · 21 | Moderate · 9 | Absent | Absent |
| Huaneng Clean Energy Research Institute Co., Ltd. | Strong · 15 | Strong · 14 | Strong · 10 | Absent | Absent |
| POSCO ICT Co., Ltd. | Strong · 17 | Strong · 9 | Absent | Absent | Absent |
| Zhou Xiwei | Absent | Strong · 15 | Moderate · 7 | Emerging · 2 | Absent |
| Honeywell International Inc. | Absent | Strong · 13 | Absent | Absent | Moderate · 5 |
Frequently asked questions
The current corpus contains 917 patent families in scope. Note that figures for the most recent 18–24 months are under-counted due to patent publication lag, so the true recent total is higher.
State Grid Corporation of China leads with 78 patent families, followed by China Electric Power Research Institute with 49 and Shanghai Jiao Tong University with 25.
The recent filing window shows 96% growth relative to the prior comparable period. Annual filings reached a recorded high of 161 in 2024 before publication lag suppresses the 2025 and 2026 counts.
China is the primary filing jurisdiction by a large margin, followed by the United States, WIPO PCT, Europe (EPO), India, and South Korea. Most of the existing IP provides limited enforcement reach outside China.
H02J (Power supply and grid systems) is overwhelmingly dominant. Secondary branches include H01M (batteries and fuel cells), G01R (electrical measurement), H02M (power conversion), and G06F/G06Q (digital data processing), each at roughly 3% of total branch records.
Honeywell International (19 patent families, flagged as a new entrant with strong recent momentum), Fluence Energy (15 patent families), and ABB (15 patent families) are the most visible Western filers in the top-20 ranking.
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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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