Thermal Propagation Barriers Patents: Top Companies & Trends 2026
Thermal propagation barrier patents for battery packs: who leads and where the field is still open
63.0% concentration. The top 5 assignees hold 264 of 419 records in scope, so most freedom-to-operate questions in this space run through a small group of filers. Annual filings rose from a single record in 2017 to a peak of 120 in 2022, then held at elevated levels; the 2021-to-2024 span alone shows filings growing from 29 to 67, a +131% increase, before the most recent two years understate true activity due to publication lag.
- 1LG ENERGY SOLUTION LTD111
- 2ASPEN AEROGELS INC72
- 3XEROTECH LTD30
- 4ELKEM SILICONES USA CORP30
- 5SK ON CO LTD21
See the full thermal propagation barriers in packs analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about this patent set
Who holds the most patents on thermal propagation barriers for battery packs?
One assignee leads clearly with 111 of the 419 records in scope, well ahead of the fifth-ranked filer at 21 records. The top 5 assignees together hold 264 records, or 63.0% of the field, and the top 10 extend that to 75.9%. This is a concentrated field at the top with a long tail among the remaining ranked companies, so competitive tracking should prioritise the leading handful of filers rather than trying to watch all 47 ranked companies equally.
Is patent filing activity for thermal propagation barriers growing or slowing down?
Filings grew substantially over the last complete comparison period available, from 29 in 2021 to 67 in 2024, a +131% increase. The single highest year on record so far is 2022 at 120 filings. Figures for 2025 and 2026 appear lower, but that reflects the roughly 18-month lag between filing and publication rather than an actual drop in activity, so those years should not be read as a slowdown yet.
What technology areas do these patents actually cover?
The dataset is anchored in H01M (batteries, cells and fuel cells), which covers 89.5% of the 419 records, since the search is built around battery-pack-level propagation control. Beneath that, B32B layered products and laminates appear in 11.5% of records and C08K polymer additives in 7.6%, indicating that barrier-material composition and layering are claimed almost as often as pack-level mechanical design. Smaller but notable slices cover fire-fighting methods (A62C, 5.5%) and heat-exchanger integration (F28F, 3.8%).
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Thermal Propagation Barriers in Packs covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.