Battery Cell Degassing and Sealing Patents: Leaders, Trends & White Space 2026
- Flat filing activity. Filings ran from 766 in 2017 to a peak of 1,219 in 2020, then eased toward 81 in the still-incomplete 2026 count — a field with occupied claim space rather than accelerating novelty.
- No single assignee dominates. The leader holds 122 records and the top 5 combined account for just 1.3% of the 39,905 records in scope, so freedom-to-operate analysis has to look past any one company.
- Packaging classes outweigh battery-specific ones. B65B packaging and wrapping (8.2% of records) and B29C plastics shaping (5.0%) each carry more filings than H01M batteries and cells (1.6%), showing where the sealing engineering actually gets claimed.
What this landscape covers
Battery cell degassing and sealing sits at the intersection of pouch-cell manufacturing, vacuum and gas-handling equipment, and heat-seal packaging engineering. The search set spans 39,905 published records filed between 2015 and mid-2026, pulled from families that reference gas removal completeness, second-seal quality, electrolyte loss, cycle time, automation or cleanliness alongside degassing or sealing terms. Publication lags filing by roughly 18 months, so the most recent filing year in any trend is understated by construction, not because activity has stopped.
Receiving-office data shows China and the United States as the two largest filing venues, with Europe, WIPO/PCT, Canada and the United Kingdom trailing at meaningfully lower volumes — a pattern consistent with equipment IP being filed close to manufacturing bases first and extended selectively.
Filing trends and technology composition
Two views of the same 39,905-record set: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
A peak already behind it
Filings rose from 766 in 2017 to a peak of 1,219 in 2020, then drifted down through a midpoint of 1,117 in 2022 toward 81 in the partial 2026 count. That trajectory reads as flat-to-declining rather than a technology still finding its footing — treat any apparent 2025-2026 drop-off as a reporting-lag artefact rather than a real slowdown.
Packaging classes lead, not battery classes
B65B (packaging and wrapping) tops the IPC composition at 8.2% of the 39,905 records, ahead of B29C plastics shaping at 5.0% and B65D containers at 4.2%. H01M (batteries, cells and fuel cells) sits further down at 1.6%, and F16J (seals and gaskets) at 1.8% — a reminder that the mechanical sealing and packaging engineering, not the electrochemistry, is where most of this claim space is written.
Shares are the percentage of the 39,905 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Battery Cell Degassing and Sealing with Eureka
This page is one run against one query. Ask Eureka your own question about battery cell degassing and sealing and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing
Method for processing components with high standard of cleanliness, and production line applying the method (US20220288841A1)
A production line for producing components to a high standard of cleanliness and sealed and protected in that state includes a loading device, a cleaning device, a detecting device, a pasting device, a heat-sealing device, a packing device, and transfer devices. The line automatically processes components for the required cleanliness, and protective film pasting, heat-sealing and packing further protect the components from subsequent pollution. A method for producing components with high cleanliness on this line is also disclosed.Filed by Fulian Yuzhan Precision Technology Co., Ltd, published 2022-09-15.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6273897B1 | Surgical bettress and surgical stapling apparatus | 2,574 |
| 2 | US20190200905A1 | Characterization of tissue irregularities through the use of mono-chromatic light refractivity | 1,117 |
| 3 | EP1129665A1 | Buttress for surgical stapling apparatus | 838 |
| 4 | US11864728B2 | Characterization of tissue irregularities through the use of mono-chromatic light refractivity | 700 |
| 5 | US5667592A | Process chamber sleeve with ring seals for isolating individual process modules in a common cluster | 651 |
| 6 | US20050054078A1 | Immunoassay device with improved sample closure | 594 |
| 7 | US20020124906A1 | Substrate transport apparatus, POD and method | 560 |
| 8 | US6284113B1 | Apparatus and method for transferring liquids | 497 |
| 9 | US20050137539A1 | Closed wound drainage system | 483 |
| 10 | US5062774A | Solution pumping system including disposable pump cassette | 480 |
Citation counts favour older filings inside any searched corpus — read them as a signal of influence, not of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the data means for a filing decision
Three findings that shape where new claims can still land and where prior art is already dense.
No gatekeeper to clear
The leading assignee holds 122 records out of 39,905, and the top 5 together account for only 1.3% of all records in scope. Freedom-to-operate work here has to screen a long tail of single- and few-filing entrants rather than clear one or two dominant portfolios.
Sealing engineering outweighs cell chemistry
B65B packaging and wrapping carries more than five times the record share of H01M battery-and-cell classifications. Equipment claims on heat-sealing, gas evacuation and packing mechanics are the densest prior art, not the electrochemical cell design itself.
Activity has already crested
Volume peaked in 2020 and has trended down through the 2022 midpoint of 1,117. Combined with the 18-month publication lag, this points to a mature claim landscape rather than one still in a land-grab phase.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to battery cell degassing and sealing, with the prior art for and against each one.
Who is filing, and who has gone quiet
The ranked leaders sit well below the concentration seen in faster-moving fields, and several previously active filers show no activity in the latest year.
A lead without dominance
The top-ranked assignee holds 122 records against a fifth-place figure of 85 and a tenth-place figure of 67 — a gentle slope rather than a cliff, meaning no one company sets the terms of this claim space.
Several known filers have stopped
A number of assignees that previously appeared in this space, including firms tracked with -100% year-on-year change, show zero filings in the latest year. That is consistent with a field past its filing peak rather than one where a leader is pulling ahead.
Co-filing is limited but present
Ten co-assignee pairs appear in the data, with the strongest pairing showing 17 shared records. Co-filing is not the norm in this field, but where it occurs it tends to link a corporate parent with a specialised component or seal manufacturer.
| Assignee | Recent year | YoY |
|---|---|---|
| Nestec Technology / Nestec S.A. | 0 | — |
| Johnson & Johnson Vision Care, Inc. | 0 | — |
| Toshiba Corporation | 0 | — |
| ResMed Limited | 0 | -100% |
| Verax Medical Systems | 0 | -100% |
| Samsung Electronics Co., Ltd. | 0 | — |
| Instill Medical Technologies Ltd. | 0 | — |
| Baxter International Inc. | 0 | — |
Where to take this analysis
The dataset points to a mature, fragmented field with specific under-claimed corners rather than one dominant assignee to design around.
Map the sealing-equipment sub-classes in detail
B65B, B29C and F16J together carry more claim density than H01M — a subclass-by-subclass review of these three areas will surface the specific mechanical approaches already occupied before a new filing is drafted.
Explore IPC breakdowns in EurekaTrack assignees that have gone quiet
Several previously active filers show zero activity in the latest year. Confirming whether that reflects abandoned R&D, acquisition, or a shift to trade secrecy changes how much weight to put on their existing portfolios.
Run assignee momentum checks in EurekaTest draft claims against the white space list
In-line gas-tightness verification and second-seal quality sensing show lighter representation in the IPC composition than core packaging classes — worth a targeted prior-art pull before committing claim language.
Search white-space branches in EurekaCommon questions about this landscape
This dataset contains 39,905 published records filed between 2015 and mid-2026 that reference degassing or sealing terms alongside gas removal completeness, second-seal quality, electrolyte loss, cycle time, automation or cleanliness. That figure counts records, not a narrower subset of granted patents, and a single invention can appear as several records across jurisdictions. Because publication lags filing by roughly 18 months, the true count for the most recent one to two years will be higher than currently shown.
The ranked leader holds 122 records, with the fifth-place assignee at 85 and the tenth-place assignee at 67 — a gradual slope rather than a small group pulling far ahead. The top 5 combined account for only 1.3% of the 39,905 records in scope, so this is a fragmented field rather than one controlled by a handful of companies. Anyone doing freedom-to-operate work here needs to screen well beyond the top-ranked names because of the long tail of single- and few-filing entrants.
No. Filings rose from 766 in 2017 to a peak of 1,219 in 2020, then declined through a midpoint of 1,117 in 2022 toward much lower counts in the most recent, still-incomplete years. Some of the apparent recent drop is a publication-lag artefact, since filings take about 18 months to appear, but the overall shape points to a field that has already passed its filing peak rather than one accelerating. That does not mean the technology is settled — it means the easy claim space has largely been staked out.
B65B, covering packaging and wrapping, is the single largest IPC subclass at 8.2% of the 39,905 records, ahead of B29C plastics shaping at 5.0% and B65D containers and packaging at 4.2%. H01M, the batteries and cells classification, sits lower at 1.6%, and F16J seals and gaskets at 1.8%. This tells a filer that most of the mechanical engineering claim density sits in packaging and plastics-shaping technology, not in battery-specific classifications, so prior-art searches should weight those classes accordingly.
The evidence points to lighter representation in specific sub-areas relative to the dense core packaging and sealing classes, including in-line gas-tightness verification, second-seal quality sensing, automated pouch degassing cycle-time reduction, and electrolyte-loss detection at the seal interface. High filing density in B65B and B29C means those core mechanical approaches are heavily claimed, not that adjacent measurement and verification branches are equally crowded. A targeted prior-art search on these narrower branches is the practical next step before drafting new claims.
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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.