Grid-Scale BESS Aging & Safety Patent Landscape 2026
The grid-scale BESS aging and safety patent space is in a confirmed growth phase, with activity up 106% over the recent filing window and China’s State Grid Corporation of China holding the top position among a fragmented field. No single applicant dominates decisively, signalling that technical differentiation and cross-jurisdictional filing remain accessible strategies for new entrants.
A fragmented but accelerating field led by State Grid Corporation of China
China leads the ranking with 14 patent families, followed closely by LG Energy Solution (13), Open Energi (12), China Electric Power Research Institute (11), and ABB (11). The top five filers account for 20% of the combined output of the hundred largest filers, confirming that no single entity commands the field.
The narrow gap between the top-ranked applicants — spread across just three families from rank one to rank five — indicates a genuinely competitive, multi-player environment rather than a monopolar structure. Utility-affiliated Chinese organizations occupy two of the top five slots, while commercial battery and grid-automation vendors (LG Energy Solution, ABB) hold the remaining three.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | State Grid Corporation of China | 14 | |
| 2 | LG Energy Solution Ltd | 13 | |
| 3 | Open Energi Ltd | 12 | |
| 4 | China Electric Power Research Institute Co Ltd | 11 | |
| 5 | ABB (Schweiz) AG | 11 | |
| 6 | Sunvertec Pty Ltd | 9 | |
| 7 | Vehicle Energy Japan Inc | 8 | |
| 8 | Honeywell International Inc | 8 | |
| 9 | Hitachi Ltd | 6 | |
| 10 | Xi’an Thermal Power Research Institute Co Ltd | 6 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | North China Electric Power University | 6 | |
| 12 | Zhou Xiwei | 6 | |
| 13 | Hyosung Heavy Industries Corporation | 5 | |
| 14 | Shanghai Jiao Tong University | 5 | |
| 15 | Hunt Energy Enterprises LLC | 5 | |
| 16 | Fluence Energy LLC | 5 | |
| 17 | Huaneng Clean Energy Research Institute | 5 | |
| 18 | Zhou Zheming | 4 | |
| 19 | Chuneng New Energy Co Ltd | 4 | |
| 20 | Tsinghua University | 4 |
The distributed positions of the leaders imply that IP is being built in parallel along two distinct value chains: grid-integration and dispatch (dominated by utility and research-institute filers) and cell-level aging and diagnostics (dominated by battery and industrial-automation vendors). An entrant can target either lane without immediately confronting a dominant incumbent.
Filings from the most recent 18–24 months are subject to publication lag and are likely under-counted in the trend data; the apparent 2026 figure should be treated as a partial-year floor, not a ceiling. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual filings still rising; power-grid integration codes dominate the technology mix
Two charts together reveal both the pace of investment and where that investment is being directed: annual filing volume shows a clear upward trajectory across the observed window, while the IPC composition identifies H02J (power supply and grid systems) as the primary technical home of this work.
Annual filing trend
Filing volume grew from 13 families in 2017 to a visible peak in the 2024–2025 range, with the 2026 bar representing an incomplete year due to publication lag. The 106% growth over the recent filing window confirms the field is in a sustained growth phase; the 2026 figure should be read as a lower bound.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (power supply and grid systems) is by far the dominant IPC class, reflecting that grid-integration and control are the primary patent focus. H01M (batteries, cells and fuel cells) is the second-largest class, capturing cell-level aging and electrochemical safety work. Classes such as G01R (electric and magnetic measurement), A62C (fire-fighting), and G06N (AI-based computing) appear at lower volumes, pointing to adjacent areas where coverage is comparatively thin.
↗ 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.
Thermal runaway event identification method of a b…
The computer-implemented method for identifying thermal runaway events in a battery module, where multiple battery modules collectively form a Battery Energy Storage System (BESS). The method includes receiving an acoustic signal from at least one acoustic sensor positioned within the BESS. A thermal runaway event is identified if there is a sudden increase… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Battery energy storage system and control system a… | 110 |
| 2 | Building and Building Cluster Energy Management an… | 83 |
| 3 | Battery energy storage control systems and methods | 64 |
| 4 | 一种用于配电网削峰填谷的电池储能系统的控制方法 | 61 |
| 5 | Hierarchical control method for island power grid … | 54 |
| 6 | Battery energy storage system and control system a… | 44 |
| 7 | Building energy management and optimization | 38 |
| 8 | Battery energy storage system controller systems a… | 38 |
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 strategy
The combination of confirmed growth, fragmented leadership, and a concentrated geographic footprint creates a specific set of strategic implications for teams deciding where to commit engineering and legal resources.
Growth-stage field with rising annual volume
The lifecycle evidence classifies this field as Growth, with annual filings still rising and the 106% recent-window increase confirming sustained momentum. The field has not yet shown the plateau or consolidation patterns typical of maturing domains. Teams entering now face an active but not yet crowded competitive environment.
Growth stageTop-five filers hold a modest 20% share — room for challengers
The top five filers account for 20% of the combined output of the hundred largest filers, and the gap between the leader (14 patent families) and the fifth-ranked applicant (11 patent families) is only three families. This is a low-concentration structure where a focused filing programme across three to five IPC subclasses could quickly bring a new entrant into the visible top tier.
Low concentrationState Grid / CEPRI axis dominates co-filing activity
The most active co-filing pair is State Grid Corporation of China and China Electric Power Research Institute, with 9 jointly filed patent families — roughly double the next-most-active dyads. State Grid also co-files with its provincial subsidiaries (Fujian, Hebei) and with the Zhangjiakou wind-solar-storage venture. Xi’an Thermal Power Research Institute and Huaneng Wuhan Power Generation Co. form the most active non-State-Grid pair, with 2 jointly filed families. This network is heavily intra-Chinese and utility-centric; cross-border or industry-academia co-filing with Western entities is not yet prominent.
China-centric ecosystemChina dominates filing volume; US and India are secondary venues
China is the primary jurisdiction by a wide margin, followed by the United States, India, and the WIPO PCT route. Europe (EPO) is the fifth jurisdiction. Japan, Canada, South Korea, and a scatter of other markets account for smaller volumes. The strong Chinese domestic footprint reflects both the leading applicants’ home markets and China’s large grid-scale storage deployment base. Filing gaps in Europe and Japan may represent exposure for applicants seeking multi-market protection.
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 | 9 |
| State Grid Corporation of China | State Grid Fujian Electric Power Research Institute | 3 |
| China Electric Power Research Institute Co Ltd | State Grid Fujian Electric Power Research Institute | 3 |
| State Grid Corporation of China | State Grid Fujian Electric Power Co Ltd | 2 |
| State Grid Corporation of China | State Grid Hebei Electric Power Research Institute | 2 |
| State Grid Corporation of China | Zhangjiakou Wind & Solar Power Energy Demonstration Co Ltd | 2 |
| China Electric Power Research Institute Co Ltd | State Grid Fujian Electric Power Co Ltd | 2 |
| China Electric Power Research Institute Co Ltd | State Grid Hebei Electric Power Research Institute | 2 |
| China Electric Power Research Institute Co Ltd | Zhangjiakou Wind & Solar Power Energy Demonstration Co Ltd | 2 |
| Xi’an Thermal Power Research Institute Co Ltd | Huaneng Wuhan Power Generation Co Ltd | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
State Grid and LG Energy Solution lead from different technical angles
The two top-ranked applicants approach the topic from opposite ends of the value chain — one from the grid-integration and dispatch perspective, the other from the cell-level aging and measurement perspective — reflecting the dual nature of BESS safety as both a system and a chemistry challenge.
State Grid Corporation of China
State Grid leads with 14 patent families and is classified as a new entrant in the most recent measurement window, with 5 recent-period families, indicating that its position has been built predominantly in recent years. Its technology focus is concentrated in H02J 3 (grid power systems, 10 subclass references), supplemented by H01M 10 (battery cells, 4) and H02J 7 (charging systems, 4) — a profile consistent with grid-dispatch and battery-management-system work rather than cell chemistry.
patent families: 14LG Energy Solution
LG Energy Solution holds 13 patent families and also shows a new-entrant trajectory in the recent window with 8 recent-period families, suggesting an accelerating filing pace from what was previously a low base. Its strongest subclass focus is H01M 10 (battery cells, 9) and G01R 31 (electrical measurement and diagnostics, 8), placing it squarely in the cell-aging characterisation and state-of-health estimation space — technically complementary to, rather than duplicative of, State Grid’s grid-systems emphasis.
patent families: 13| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| State Grid Corporation of China | 5 | ▲ new entrant |
| LG Energy Solution Ltd | 8 | ▲ new entrant |
| China Electric Power Research Institute Co Ltd | 4 | ▲ new entrant |
| Sunvertec Pty Ltd | 8 | ▲ new entrant |
| ABB (Schweiz) AG | 8 | ▲ new entrant |
| Honeywell International Inc | 6 | ▲ new entrant |
| Hitachi Ltd | 2 | ▲ new entrant |
| Xi’an Thermal Power Research Institute Co Ltd | 3 | ▲ new entrant |
Under-served branches adjacent to the dominant grid-systems core
Several IPC classes sit at the margins of the current patent cluster, representing areas where technical activity is plausible but patent coverage is comparatively sparse relative to the field’s overall scale.
G01R · Electric & magnetic measurement (diagnostic instrumentation)
With 54 patent-record occurrences and a 7% share of the technology composition, G01R is the largest of the adjacent branches and covers the electrical measurement methods central to state-of-health and state-of-charge estimation in aging BESS. The entry path is concrete: impedance spectroscopy, in-situ current and voltage sensing, and insulation resistance monitoring all map here. LG Energy Solution and ABB already show G01R subclass activity, confirming commercial interest, but volume remains low relative to the H02J core — suggesting filing headroom for specialised measurement and diagnostics players.
Search this in Eureka →A62C · Fire-fighting (thermal runaway suppression)
A62C captures fire detection and suppression technologies, directly relevant to thermal runaway — the most consequential safety failure mode in grid-scale BESS. Only 14 patent-record occurrences appear in this class, making it the sparsest of the explicitly safety-related branches. Given the regulatory and insurance pressure on BESS fire safety, and the technical specificity of suppression systems for enclosed battery enclosures (gaseous agents, early warning sensors), this branch has plausible technical value and a realistic entry path for fire-safety specialists and system integrators.
Search this in Eureka →How leading applicants differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | H02J 3 · Power supply & grid systems | H01M 10 · Batteries, cells & fuel cells | H02J 7 · Power supply & grid systems | G01R 31 · Electric & magnetic measurement | H01M 50 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Sunvertec Pty Ltd | Absent | Strong · 9 | Absent | Strong · 7 | Strong · 9 |
| LG Energy Solution Ltd | Absent | Strong · 9 | Moderate · 4 | Strong · 8 | Absent |
| State Grid Corporation of China | Strong · 10 | Moderate · 4 | Moderate · 4 | Absent | Absent |
| Open Energi Ltd | Strong · 12 | Absent | Moderate · 4 | Absent | Absent |
| China Electric Power Research Institute Co Ltd | Strong · 7 | Strong · 5 | Moderate · 3 | Absent | Absent |
| Hitachi Ltd | Strong · 7 | Absent | Strong · 5 | Moderate · 2 | Absent |
| Vehicle Energy Japan Inc | Absent | Strong · 4 | Strong · 4 | Strong · 4 | Absent |
Frequently asked questions
The evidence covers 380 patent families in scope. Filing volume has grown 106% over the recent window, and the field is classified in a Growth lifecycle stage with annual volume still rising.
State Grid Corporation of China leads with 14 patent families, followed by LG Energy Solution (13 patent families) and Open Energi (12 patent families). The top five filers together account for 20% of the combined output of the hundred largest filers.
H02J (power supply and grid systems) is by far the dominant IPC class, followed by H01M (batteries, cells and fuel cells). G01R (electric and magnetic measurement) is the largest adjacent class, relevant to aging diagnostics and state-of-health estimation.
China is the primary jurisdiction by volume, followed by the United States, India, WIPO (PCT), and Europe (EPO). Japan, Canada, and South Korea account for smaller volumes, and several other markets have only single-digit coverage.
The field is fragmented. The top-ranked applicant holds only 14 patent families, and the gap between first and fifth place is just three families. The low top-five share among the hundred largest filers means a targeted filing programme can bring a new entrant into visible competitive standing relatively quickly.
The most active co-filing relationship is between State Grid Corporation of China and China Electric Power Research Institute, with 9 jointly filed patent families. State Grid also collaborates with several provincial grid subsidiaries. Xi’an Thermal Power Research Institute and Huaneng Wuhan Power Generation Co. are the most prominent non-State-Grid co-filers. Cross-border or industry-academia collaboration with Western organisations is not yet prominent in the evidence.
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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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