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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/ev-fire-protection-and-pack-venting-materials-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Functional MaterialsEV Fire Protection and Pack Venting Materials Patents
- Three assignees account for all 29 records in scope, with no fourth or fifth filer visible in this dataset — a genuinely narrow field rather than one with a long invisible tail.
- Filings peaked at 24 in 2021 and have since fallen back toward single digits, suggesting the core claim positions were staked out early and the pace of new filing has cooled.
- 93.1% of records sit in H01M (battery cells) but only 20.7% touch B32B (layered products), pointing to laminate and multilayer barrier construction as a comparatively open construction route.
29
Published Records
-100%
3-Yr Growth (lag-adjusted)
EP
Leading Jurisdiction
2021
Peak Filing Year
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks patent activity at the intersection of battery fire protection materials, thermal runaway barriers, and pack venting materials — the compressible mica composites, aerogels, and nonwoven felts placed between or around cells to slow flame and heat propagation once a cell goes into thermal runaway. The search combines claim-level terms for these material classes with test-and-property language such as flame penetration time, compressibility, and regulatory fire test, so the corpus is narrower than general battery-safety filing and closer to the specific materials and test methods engineers actually specify.
The 29 records in scope span 2015 through the middle of 2026, with receiving offices concentrated in Europe, the United States, and the WIPO PCT route. Because publication typically lags filing by around 18 months, the most recent one to two years of activity in this dataset will understate actual filing volume.
Filing activity and technology composition
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Data
Filing trend and technology composition
Two views of the same 29 records: how filing activity has moved year over year, and which IPC subclasses the claims sit in.
Filing trend, 2017-2026
Filings were flat near zero through 2017-2019, then rose sharply to a peak of 24 in 2021 before falling back — 2022 sits at just 2. That shape is consistent with a short, concentrated filing push around a specific barrier-material design rather than sustained incremental activity across many entrants.
IPC subclass distribution
H01M (batteries, cells & fuel cells) covers 93.1% of the 29 records, confirming that nearly every filing frames the material as a battery-pack component rather than a generic fire-protection product. D04H (nonwovens & felts) appears in 55.2% of records, reflecting the prevalence of felt and mat constructions, while B32B (layered products & laminates) appears in only 20.7% — a smaller but still meaningful share given a record can carry more than one class.
Shares are the percentage of the 29 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on EV Fire Protection and Pack Venting Materials with Eureka
This page is one run against one query. Ask Eureka your own question about ev fire protection and pack venting materials and every answer comes back with the patent numbers behind it.
Try EurekaKey Patents
Most-cited barrier patents
Representative Filing
Load distributing thermal runaway barrier for a battery cell (US20230395900A1)
GM GLOBAL TECHNOLOGY OPERATIONS LLC
The filing describes a thermal runaway barrier built from paired separator plates with elastic members between them, each configured to hold a defined load when pressure is applied. Multiple separator-plate pairs are stacked so the barrier absorbs and distributes cell-swelling forces across the pack rather than concentrating them at a single point.Assignee and filing date are rendered separately above.
Highest-citation records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2022024076A1 | Battery cell thermal runaway barrier | 41 |
| 2 | WO2021144758A1 | Thermal runaway barrier for a rechargeable electrical energy storage system | 27 |
| 3 | WO2022024085A1 | Battery cell thermal runaway barrier | 24 |
| 4 | US20230058396A1 | Thermal runaway barrier for a rechargeable electrical energy storage system | 13 |
| 5 | US20230282905A1 | Battery cell thermal runaway barrier | 9 |
| 6 | US20230275289A1 | Battery cell thermal runaway barrier | 6 |
| 7 | US20230238600A1 | Battery cell thermal runaway barrier | 6 |
| 8 | WO2022024078A1 | Battery cell thermal runaway barrier | 6 |
Citation counts reflect the searched corpus at the time of the data cut and skew toward older, earlier-filed records — they signal influence within this dataset, not present-day importance.
Publication numbers are shown where the record carries one (8 of 8 rows); clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three patterns stand out once the raw counts are read against each other.
Concentration
29 = 100.0% of records
top 3 assignees, all 29 records
A narrow field, not a crowded one
All 29 records in scope trace to three assignees, with no fourth or fifth filer appearing at all. That is unusual for a materials category this specific — it suggests either a genuinely young sub-field or one where most relevant art has been folded into adjacent, more broadly worded battery-safety filings that this search does not capture.
Ranking is the complete set returned, not a top-N cut.
Momentum
Peak 24 in 2021
filings per year
The filing push has already happened
Volume rose from near zero to 24 filings in 2021, then dropped to 2 by 2022. Recent-year figures are understated by publication lag, but the shape still points to a concentrated design push around 2020-2021 rather than a steadily building trend, and none of the three ranked assignees show latest-year filings above zero.
Publication lag of roughly 18 months affects the most recent one to two years most.
Claim geography
93.1% vs 20.7%
H01M share vs B32B share
Battery-cell framing dominates, laminate framing does not
Almost every record (93.1% of 29) is classified under H01M, confirming the invention is claimed as a battery-pack element. Layered-product framing under B32B covers only 20.7%, which is the more open construction route for new laminate or composite barrier designs that do not simply restate the cell-integration claims already staked out.
Class shares sum above 100% because records can carry multiple IPC codes.
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to ev fire protection and pack venting materials, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who holds the ground
Three assignees make up the entire ranked set for this search, and none show filing activity in the latest year.
Leader
26 records
of 29 in scope
One assignee holds the majority position
The leading assignee accounts for 26 of the 29 records in scope, making it the dominant filer by a wide margin within this narrow search. Its portfolio anchors most of the highest-cited barrier patents identified in this dataset.
0 filings in the latest year for this assignee.
Automotive OEM
US20230395900A1
representative filing
GM's separator-plate barrier design
GM Global Technology Operations is the assignee behind the representative filing in this dataset, a load-distributing barrier built from paired separator plates with elastic members. It is one of a small number of automotive-OEM-originated designs in a field otherwise dominated by a materials supplier.
0 filings in the latest year for this assignee.
Specialty supplier
0% YoY latest year
growth
Composite specialist with a stalled filing pace
Alpha Engineered Composites LLC rounds out the ranked set. Its filing pace shows a -100% year-on-year change into the latest year, consistent with the broader flattening seen across all three assignees after the 2021 peak.
Figures reflect the complete ranked set, not a top-50 or top-100 cut.
Recent-year momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| 3M Innovative Properties Company (USA) | 0 | — |
| GM Global Technology Operations LLC | 0 | — |
| ALPHA ENGINEERED COMPOSITES LLC | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to a narrow, concentrated field with a stalled recent filing pace — the next steps depend on whether you are clearing a design or scouting white space.
Run a freedom-to-operate check on separator-plate and laminate designs
With citation weight concentrated in a small number of thermal-runaway-barrier families, a targeted claim chart against the highest-cited records is more useful here than a broad landscape re-run.
Start a claim comparison in EurekaWatch for renewed filing after the 2021-2022 lull
None of the three ranked assignees show latest-year activity, but publication lag means 2025-2026 filings may not yet be visible. Set an alert rather than concluding the field has gone quiet.
Set up monitoring in EurekaExplore laminate and aerogel construction claims
B32B coverage sits at 20.7% against H01M's 93.1%, leaving layered-product and aerogel-membrane framing comparatively open for new claim drafting.
Explore white space in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
Within this dataset of 29 records, one assignee holds 26 of them, making it the clear dominant filer. The remaining two ranked assignees are an automotive OEM and a specialty composites supplier, together accounting for the rest of the records. This is a complete ranking of three assignees returned by the search, not a top-50 or top-100 cut, so there is no long tail of smaller filers visible here.
No, filing peaked at 24 records in 2021 and had fallen to 2 by 2022, with all three ranked assignees showing zero filings in the latest year. Because publication typically lags filing by around 18 months, the most recent one to two years may still be understated, so this should be read as a plateau or decline signal rather than a definitive stop. A monitoring alert is more reliable than a single snapshot for confirming whether filing has genuinely paused.
The search terms center on compressible mica composites, aerogels, and nonwoven felts placed between or around battery cells to slow flame and heat propagation during thermal runaway. In IPC terms, 93.1% of the 29 records sit in H01M (batteries and cells), 55.2% touch D04H (nonwovens and felts), and 20.7% touch B32B (layered products and laminates). The overlap between these classes reflects that most designs combine a felt or fibrous layer with a rigid or semi-rigid battery-pack structure.
Layered-product and laminate construction under B32B covers only 20.7% of the 29 records, well below the 93.1% share claimed under core battery-cell integration (H01M), making multilayer laminate stacks and aerogel venting membranes comparatively under-claimed. Particle-capture venting filters and regulatory-fire-test-driven material grading also appear thin relative to the concentration of citation weight in a handful of separator-plate barrier families. A first claim in these branches would need to differentiate on material construction or test performance rather than on cell-integration geometry, which is already densely claimed.
US20230395900A1, assigned to GM Global Technology Operations, claims a load-distributing thermal runaway barrier built from paired separator plates with elastic members between them, each configured to maintain a defined load under applied pressure. Multiple plate pairs are stacked so the assembly distributes cell-swelling and thermal-runaway pressure across the pack rather than concentrating it at one point. Anyone designing a separator-plate-and-elastic-member barrier for load distribution in a battery pack should review this filing's specific claim language before finalizing a similar mechanical arrangement.
Answers are grounded in the same dataset. Derived from a Patsnap search on EV Fire Protection and Pack Venting Materials covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Research EV Fire Protection and Pack Venting Materials in depth with Eureka
Go past this page: query the whole ev fire protection and pack venting materials corpus yourself, in your own scope.
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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.