BESS Round-Trip Efficiency Patent Landscape 2026
The BESS round-trip efficiency patent space is in a growth phase, with activity accelerating sharply since 2022 and China and the United States together accounting for the largest share of filings. The field remains fragmented at the top, with no single applicant holding a commanding position, leaving meaningful room for new entrants to establish leadership.
Fragmented leadership with Sunvertec holding a narrow edge
Sunvertec Pty Ltd leads all ranked applicants with 9 patent records, ahead of a cluster of five organizations each holding 5 patent records: Hyosung Heavy Industries, Hunt Energy Enterprises, Chucneng New Energy, BluWave Inc., and King Fahd University of Petroleum and Minerals.
The top five filers account for just 19% of the combined total across the hundred largest filers, confirming a highly dispersed competitive structure with no dominant incumbent. The gap between the leader and the second tier is narrow — only four patent records — which means the ranking is contestable.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Sunvertec Pty Ltd | 9 | |
| 2 | Hyosung Heavy Industries Corp. | 5 | |
| 3 | Hunt Energy Enterprises LLC | 5 | |
| 4 | Chucneng New Energy Co., Ltd. | 5 | |
| 5 | BluWave Inc. | 5 | |
| 6 | King Fahd University of Petroleum and Minerals | 5 | |
| 7 | StoreDot Ltd. | 4 | |
| 8 | Veloce Energy Inc. | 4 | |
| 9 | Redwood Materials Inc. | 3 | |
| 10 | LS Electric Co., Ltd. | 3 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Fluence Energy LLC | 3 | |
| 12 | State Grid Corporation of China | 3 | |
| 13 | ELT Inc. | 2 | |
| 14 | Smartkosh Tech Pte Ltd | 2 | |
| 15 | SAUDI DATA & ARTIFICIAL INTELLIGENCE AUTHORITY (SD… | 2 | |
| 16 | State Grid Shanghai Municipal Electric Power Co. | 2 | |
| 17 | Lohum Materials Pte Ltd | 2 | |
| 18 | State Grid Tianjin Electric Power Company | 2 | |
| 19 | CALB Group Co., Ltd. | 2 | |
| 20 | Huaneng Clean Energy Research Institute | 2 |
The breadth of entity types in the top tier — an Australian hardware firm, a Korean industrial conglomerate, a US energy startup, a Chinese battery manufacturer, a Canadian software platform, and a Saudi university — reflects the multi-disciplinary nature of round-trip efficiency improvement, spanning electrochemistry, power electronics, and control software.
Filing counts for 2025 and 2026 are understated due to patent publication lag, so the apparent plateau in those years should not be read as a slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity has surged since 2022; grid systems dominate the technology mix
Two views of the corpus — the annual filing trend and the IPC technology composition — together reveal both the pace of the field and the technical routes being pursued.
Annual filing trend
Annual filings were modest and uneven from 2017 through 2021, then rose sharply from 10 records in 2022 to 25 in 2023 and 26 in 2024, representing a 259% increase over the recent window. The 2025 and 2026 figures are incomplete due to publication lag and should be treated as lower bounds, not a trend reversal.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H02J (power supply and grid systems) is by far the most represented IPC class, followed by H01M (batteries, cells, and fuel cells). Lower-count classes — including B60L (electric vehicle propulsion), H02M (power conversion), and G05B (control and regulating systems) — are present but sparse relative to the core, indicating that the field is currently anchored in grid-integration and electrochemical cell work rather than power-electronics or control-layer optimization.
↗ 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.
Battery energy storage system and operating method…
An operating method for a Battery Energy Storage System (BESS) is provided. The BESS includes a processor and a plurality of energy storage units coupled in parallel, wherein each energy storage unit includes a Power Conservation System (PCS) and a battery module. The operating method includes performing following steps by the processor: obtaining a… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 光储荷智能化管理一体机及光储荷智能化管理方法 | 50 |
| 2 | Method and apparatus for controlling hybrid grids | 24 |
| 3 | 一种原边集成式模块化独立控制电池储能系统 | 19 |
| 4 | Capacity regenerable excess electrolyte zn ion bat… | 15 |
| 5 | 一种电池储能系统 | 15 |
| 6 | System and method for fluctuating renewable energy… | 10 |
| 7 | Internally adjustable modular single battery syste… | 10 |
| 8 | 可重构电池储能系统的优化运行方法、系统、设备及介质 | 9 |
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 structural data means for R&D investment decisions
The combination of strong recent growth, dispersed ownership, and a technically broad IPC distribution creates both urgency and optionality for teams entering or expanding in this space.
Early-growth stage with accelerating annual volume
The field is classified as Growth, with annual filings still rising and the most recent years understated by publication lag. The 259% growth in the recent window confirms the field has moved decisively past the exploratory phase. Teams entering now face a window before dominant positions solidify.
Growth stageTop five hold only 19% of the leading-hundred filers’ total
The top five filers’ share of the hundred largest filers is 19%, indicating no entrenched incumbent. All top-tier applicants appear as new entrants in the momentum data, meaning the current ranking reflects early positioning rather than durable moats. A focused filing program in a specific technical sub-route could rapidly establish a differentiated position.
Low concentrationNo co-applicant activity detected in the corpus
The collaboration evidence is pending — no co-filing relationships are recorded in the current dataset. This is consistent with the early-growth stage of the field, where organizations are typically filing independently to establish priority rather than co-developing. The absence of alliances also means partnership opportunities remain open.
Evidence pendingChina and the US lead filings; India is a notable third jurisdiction
China is the leading filing jurisdiction, followed by the United States and India. Europe (EPO) and WIPO (PCT) together account for a smaller but strategically important share, relevant for organizations seeking international protection. South Korea, Australia, Canada, and Israel also appear, reflecting the globally distributed applicant base.
Multi-jurisdictionGo 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.
Co-filing pairs, ranked by the number of jointly-filed patent families.
Sunvertec leads on electrochemical cell depth; Hyosung anchors grid-systems work
The two organizations with the most distinct and internally consistent technical profiles among top-ranked applicants are Sunvertec Pty Ltd and Hyosung Heavy Industries, each approaching round-trip efficiency from different parts of the system stack.
Sunvertec Pty Ltd
Sunvertec holds 9 patent records — the highest count among ranked applicants — with a technology focus concentrated in H01M 10 and H01M 50 (battery cell and pack engineering) and G01R 19 (electrical measurement). Its momentum profile shows it as a new entrant, meaning this position has been built rapidly. The cell-level and measurement emphasis suggests a hardware-centric approach to efficiency improvement.
patent records: 9Hyosung Heavy Industries
Hyosung Heavy Industries holds 5 patent records, with activity concentrated in H02J 3 and H02J 7 (grid-connected power supply and battery charging systems). Its momentum profile also marks it as a new entrant. As a major Korean industrial manufacturer with an established BESS product line, Hyosung’s focus on the grid-interface layer complements rather than overlaps with Sunvertec’s cell-level work.
patent records: 5| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Sunvertec Pty Ltd | 8 | ▲ new entrant |
| King Fahd University of Petroleum and Minerals | 5 | ▲ new entrant |
| Chucneng New Energy Co., Ltd. | 5 | ▲ new entrant |
| Hunt Energy Enterprises LLC | 2 | ▲ new entrant |
| Veloce Energy Inc. | 4 | ▲ new entrant |
| Fluence Energy LLC | 3 | ▲ new entrant |
Under-served adjacent branches worth monitoring
Several IPC classes appear in the corpus at low counts relative to the dominant H02J and H01M branches, signaling areas where the existing patent coverage is sparse. These are observations of relative sparsity; technical value and entry feasibility vary and should be validated before treating them as investment targets.
H02M · Power conversion (AC/DC etc.)
With only 16 patent records in a corpus of 119 patent families, power-conversion topology — inverters, DC-DC converters, and charge/discharge switching architectures — is under-represented relative to grid-system and cell-level work. Converter efficiency directly governs round-trip losses, making this a technically relevant gap. Entry would require expertise in wide-bandgap semiconductor devices and converter control, and would complement the dominant H02J and H01M positions held by current leaders.
Search this in Eureka →G05B · Control & regulating systems
G05B accounts for only 11 patent records, despite control-layer optimization — including adaptive charging protocols, state-of-health-aware dispatch, and predictive efficiency management — being a recognized lever for improving round-trip efficiency at the system level. BluWave Inc. has filed in this space (G05B 13), but the overall coverage remains sparse. Software-centric or AI-augmented control strategies would be a plausible entry path for organizations with data and algorithm capabilities rather than hardware manufacturing scale.
Search this in Eureka →Frequently asked questions
The corpus comprises 119 patent families. This is a focused, specialized sub-field rather than a broad technology category, which means the rankings and concentration figures reflect a relatively compact and still-forming competitive landscape.
Sunvertec Pty Ltd leads with 9 patent records. A group of five organizations — Hyosung Heavy Industries, Hunt Energy Enterprises, Chucneng New Energy, BluWave Inc., and King Fahd University of Petroleum and Minerals — each hold 5 patent records.
The lifecycle is classified as Growth. Annual filings rose from 10 records in 2022 to 25 in 2023 and 26 in 2024, representing a 259% increase over the recent window. The 2025 and 2026 counts are incomplete due to publication lag and should not be read as a slowdown.
China is the leading jurisdiction, followed by the United States and India. Europe (EPO) and WIPO (PCT) filings are present but smaller in count. South Korea, Australia, Canada, and Israel also appear in the jurisdiction distribution.
H02J (power supply and grid systems) and H01M (batteries, cells, and fuel cells) dominate the corpus. Adjacent classes such as H02M (power conversion), G05B (control and regulating systems), and G01R (electrical measurement) are present but carry significantly fewer patent records, making them under-served relative to the core.
No co-applicant activity is recorded in the current dataset. All momentum leaders appear as new entrants filing independently, which is consistent with the early-growth stage of the field. No established alliances or joint-development filing programs are visible in the evidence.
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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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