Hybrid Supercapacitor Manufacturing Process Patent Landscape 2026
- A small, still-open field. 25 families total, peaking at 6 in 2023, with the 2022 midpoint at 3 — growth is flat, not accelerating.
- Filing is US- and India-led. United States (10) and India (8) together outnumber China (2), Europe (1) and South Korea (1) combined.
- Citations sit on lithium-ion capacitor basics. The most-cited records are foundational lithium-ion capacitor filings, not recent process patents — recent work hasn't yet earned equivalent citation weight.
Filing growth compares 2021 (2 records) with 2024 (1) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 25 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families at the intersection of hybrid, asymmetric and lithium-ion capacitor design and the manufacturing steps used to build them — electrode coating, cell assembly, roll-to-roll processing and pre-lithiation — filtered to the capacitor-specific IPC classes H01G11/86, H01G11/84 and H01G13. It is a manufacturing-process view of the technology, not a materials-chemistry one.
At 25 families across roughly a decade, this is a narrow, still-forming corpus rather than a mature one. Publication lags filing by around 18 months, so the 2025–2026 count is an undercount of what has actually been filed.
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Filing trend and technology mix
The trend line and the IPC mix both point to a process still concentrated on core capacitor design rather than broadening into adjacent hardware or materials disciplines.
Ten years, one visible peak
Filings run from zero in 2017 to a peak of 6 in 2023, with 2026 (partial) already at 2. The 2022 midpoint of 3 sits below the peak, suggesting a single cluster of activity rather than sustained year-on-year growth.
Capacitor-first, battery-adjacent
All 25 records sit in H01G (capacitors); 6 also touch H01M (batteries and cells), consistent with pre-lithiation work that borrows battery-electrode logic. Single records in C01G, C23C and H01L mark isolated forays into metal-compound chemistry, coating deposition and semiconductor-adjacent processing — too thin to call trends.
Shares are the percentage of the 25 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe records other filings build on
Method for pre-lithiating lithium-ion capacitor (US20260051443A1, Hyundai Motor Company, 2026-02-19)
The filing describes preparing cathodes, anodes and separators, stacking them with alternating lithium-foil-coated and uncoated anode surfaces, injecting electrolyte and running a multi-step charge sequence. Cathode collectors carry air pores across a wide 0.001%–50% area range while anodes carry fewer or none, and pressing, temperature and charge-rate control move lithium ions from coated to uncoated anodes during formation.Claim scope centres on the alternating coated/uncoated anode stack and the pore-area control range — both are specific enough to be designed around rather than blocking the whole pre-lithiation route.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180374656A1 | Lithium-ion capacitor | 12 |
| 2 | US20190287736A1 | Novel ultra-thin lithium-ion capacitor with ultra-high power performance | 8 |
| 3 | US11521804B2 | Ultra-thin lithium-ion capacitor with ultra-high power performance | 4 |
| 4 | WO2020204728A1 | Method for pre-lithiating a lithium-ion capacitor | 3 |
Citation counts favour older filings simply because they've had longer to be cited — read this as influence on the field's vocabulary, not as a signal of current commercial importance.
Publication numbers are shown where the record carries one (4 of 4 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers actually indicate
Three patterns matter more than the headline count: where filings are being routed, what technical steps they protect, and how thin the citation base still is.
Two markets carry the filing load
The United States and India account for 18 of the corpus's receiving-office filings, well ahead of WIPO's PCT route (3), China (2), Europe (1) and South Korea (1). A process claim cleared in the US or India offices has not necessarily been tested anywhere else.
One cluster, not a curve
Filing rose to a single peak in 2023 and has not sustained that pace since. With the midpoint year sitting at half the peak, this reads as a burst of activity around a specific technical push rather than compounding growth.
Influence sits with older lithium-ion capacitor art
The most-cited record in the set is a 2018 lithium-ion capacitor filing, not a recent process patent. Newer pre-lithiation and coating filings haven't accumulated comparable citation weight yet, which is expected given how citation counts build over time.
Filing is mostly solo
Only one co-assignee pairing appears in the dataset, linking two automotive groups. The near-absence of joint filings suggests manufacturing-process IP here is being built in-house rather than through cross-licensing or joint development.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hybrid supercapacitor manufacturing process, with the prior art for and against each one.
Who is filing, and how recently
Momentum in the latest year is thin across the board — most tracked assignees show zero recent activity, and the single filer with a positive count filed once.
Winner Technology Co., Ltd. (Winner Technology)
The only assignee in the tracked set with a positive filing count in the most recent year — a single family, but the sole sign of active near-term filing among the names monitored here.
Boda Co., Ltd., GENERAL CAPACITOR LLC, GODI INDIA PVT LTD
These assignees hold families in the corpus but show no filings in the latest tracked year, consistent with the broader flat-to-declining trend after the 2023 peak.
NANOCAPS AS
The steepest year-on-year change in the tracked set belongs to NANOCAPS AS, moving to zero filings after prior activity — a pattern worth checking against company-level news before reading too much into it.
| Assignee | Recent year | YoY |
|---|---|---|
| Winner Technology Co., Ltd. | 1 | — |
| Boda Co., Ltd. | 0 | — |
| GENERAL CAPACITOR LLC | 0 | — |
| NANOCAPS AS | 0 | -100% |
| GODI INDIA PVT LTD | 0 | — |
| CPC Corporation, Taiwan | 0 | — |
| Jinzhou Kaimei Energy Co., Ltd. | 0 | — |
| Kia Motors Corporation | 0 | -100% |
Where to take this
The corpus is small enough that a single well-drafted claim can still open real space, but that also means the freedom-to-operate picture can shift quickly with each new filing.
Model the pre-lithiation claim boundary
Map exactly where US20260051443A1 and the WO2020204728A1 pre-lithiation filing diverge on coated/uncoated anode ratios and pore-area ranges, then test a draft claim against both.
Explore in Eureka →Track the automotive co-filing pattern
Kia and Hyundai are the only co-assignee pair in the set — watch whether other automotive OEMs start filing jointly on cell-assembly steps as electrification programs scale.
Explore in Eureka →Re-run the geography split by office
With US and India carrying 18 of the filings between them, check whether equivalent protection exists in China, Europe or Korea before assuming freedom to operate there.
Explore in Eureka →Common questions on this landscape
In this dataset it means a filing that combines hybrid, asymmetric or lithium-ion capacitor terminology with a manufacturing-process term — electrode coating, cell assembly, roll-to-roll processing or pre-lithiation — and sits in one of the capacitor-specific IPC classes H01G11/86, H01G11/84 or H01G13. That combination excludes pure materials-chemistry patents and pure capacitor-design patents that don't specify a manufacturing step. It's a deliberately narrow cut aimed at process and assembly claims rather than the electrode chemistry itself.
Patent publication typically lags the actual filing date by around 18 months, so any filing made in late 2024 or through 2025 may not yet be published and searchable. The 2026 figure in this dataset is partial for that reason, not because filing activity has stopped. Treat the last one to two years of any trend line as a floor, not a ceiling.
Not yet, at 25 total families across roughly a decade. The most-cited records are older foundational lithium-ion capacitor filings, and the citation base for the newer pre-lithiation-specific claims — including the 2026 Hyundai filing — is still thin. That leaves room for narrowly drafted claims on specific process parameters like pore-area ranges or coating patterns, even though the broad concept of pre-lithiating a stacked cell is already described in prior art.
The receiving-office data shows the United States and India carrying the bulk of filings (10 and 8 respectively), with WIPO PCT, China, Europe and South Korea each holding only one to three filings. That doesn't mean those other markets are open — it may simply mean coverage there hasn't been tracked yet or hasn't been pursued. Anyone assessing freedom to operate outside the US and India should check family-member coverage directly rather than assuming a gap.
Not necessarily. Citation counts accumulate over time, so older patents — like the 2018 lithium-ion capacitor filing with 12 citations in this corpus — will almost always outrank recent ones regardless of current relevance. A high citation count says a filing shaped the vocabulary and framing that later filers had to reference, which is a useful signal for understanding prior art, but it should not be read as a ranking of which patents matter most for a 2026 product decision.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.