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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/aluminum-extrusion-for-battery-enclosures-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Metal Forming & Special ProcessesAluminum Extrusion for Battery Enclosures: Patents, Leaders and Filing Trends
- Filings peaked in 2020 at 70 records and have since flattened the midpoint year (2022, 32 records) sits well below peak, signalling a maturing rather than an accelerating field.
- The top 5 assignees hold only 14.5% of the 821 records in scope concentration is real but shallow, with a long tail of single- and few-filing entrants doing most of the recent work.
- Alloy and heat-treatment classes (C22F, C22C, C21D) together touch a large share of records alongside the core extrusion class B21C, showing that composition and temper control, not just profile geometry, are where claims cluster.
821
Published Records
14%
Top-5 Share of All Records
+38%
3-Yr Growth (lag-adjusted)
CN
Leading Jurisdiction
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this field covers
Aluminum extrusion for battery enclosures sits at the intersection of structural crashworthiness, alloy metallurgy and joining technique. Patent activity here spans extruded profile design for load paths, alloy composition tuned for extrudability and strength, temper selection after extrusion, and the welding and sealing steps — often friction stir welding — that turn extruded sections into a leak-tight enclosure. The dataset covers 821 published records from 2015 through the 2026 cut-off, drawing on filings that combine extrusion-specific language with structural and process claims such as crash load path, leak tightness or temper selection.
Because publication lags filing by roughly 18 months, the most recent filing years in the trend are undercounted and should be read as a floor, not a ceiling.
Filing activity, 2017-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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
The two views below cover the same 821 records from different angles: one tracks when the work was filed, the other shows which parts of the patent classification system carry the claims.
Filings rose to a 2020 peak, then flattened
Annual filings climbed from 19 in 2017 to a peak of 70 in 2020, then eased back; by the 2022 midpoint they stood at 32, and the 2026 figure of 8 is a partial year still working through the publication lag.
Extrusion, alloy and treatment classes dominate
B21C (metal extrusion and drawing) leads at 25.3% of the 821 records, with C22F (non-ferrous metal treatment) and C22C (alloys) close behind at 22.0% and 19.7%. Structural vehicle classes such as B62D and B60R appear at lower but non-trivial shares, confirming that most claim activity sits in materials and process rather than vehicle-body integration.
Shares are the percentage of the 821 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 Aluminum Extrusion for Battery Enclosures covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Aluminum Extrusion for Battery Enclosures with Eureka
This page is one run against one query. Ask Eureka your own question about aluminum extrusion for battery enclosures and every answer comes back with the patent numbers behind it.
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Representative and most-cited filings
Representative Filing
Extruded profile of an aluminium alloy and method for producing an extruded profile
HYDRO EXTRUDED SOLUTIONS AS
An extruded profile, suitable for building and construction applications, made of an aluminum alloy having the following composition, in percent by weight (wt.-%): Si 0.20-0.38, Mg 0.20-0.38, Fe 0.10-0.30, Mn 0.02-0.10, Cu equal to or less than 0.10, Zn equal to or less than 0.15, Cr equal to or less than 0.05, Ti equal to or less than 0.10, impurities equal to or less than 0.05 wt.-% each and equal to or less than 0.15 wt.-% in total, the reminder being Al.Filed by Hydro Extruded Solutions AS, published 2025-07-17 — a recent example of composition claims narrowing tightly around specific weight-percent ranges.
Most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4961712A | Mechanical and electrical connection between an extruded metal profile and a cast metal member | 88 |
| 2 | US20030122332A1 | Wheel chair with monocoque-type body | 70 |
| 3 | CN108118210A | 一种铝合金及其挤压型材的加工方法 | 68 |
| 4 | CN110669964A | 一种高性能稀土Al-Mg-Si铝合金挤压材料及其制备方法 | 63 |
| 5 | DE102009003161A1 | Brake disc comprises a support disc made of thermally stable light metal alloy, a thermally insulating fricti… | 63 |
| 6 | US6178595B1 | Mounting for a door leaf | 62 |
| 7 | US6250410B1 | Motor vehicle with a supporting structure of light alloy | 61 |
| 8 | DE4422537A1 | Air intake channel air flap | 54 |
| 9 | EP1642754A1 | Suspension arm | 53 |
| 10 | US5238633A | Method and apparatus for recycling plastic waste into a thin profile, mechanically reinforced board | 51 |
Citation counts favor older records inside any searched corpus and should be read as a signal of influence, not current importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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
Read together, the concentration, trend and classification figures point to a field with occupied core claim space and a long, active tail rather than a two- or three-player race.
Concentration
14.5%
of 821 records held by top 5
Leadership is shallow, not dominant
The leading assignee holds 29 records and fifth place holds 14, but the top 5 combined account for only 14.5% of the 821 records in scope. That leaves the bulk of filing activity spread across a long tail, which matters for freedom-to-operate work: no single portfolio blocks the field.
Top 10 combined reach 21.6% of all records.
Filing momentum
70 → 8
peak year 2020 vs. partial 2026
Activity has flattened since 2020
Annual filings rose from 19 in 2017 to a peak of 70 in 2020, then declined through the 2022 midpoint of 32. The 2026 figure is a partial year, but the multi-year trend before it already shows a plateau rather than continued growth.
Publication lag means 2025-2026 counts will rise somewhat as they backfill.
Class overlap
25.3% / 22.0% / 19.7%
B21C / C22F / C22C shares of records
Composition and treatment claims rival geometry claims
B21C (extrusion and drawing) leads at 25.3% of the 821 records, but C22F (non-ferrous treatment) and C22C (alloys) are close behind. A profile-geometry filing that ignores alloy composition and temper claims risks overlapping dense adjacent art rather than clearing it.
Shares sum above 100% because records carry multiple IPC classes.
Recent momentum
0 in latest year
for several previously active assignees
Several established filers have gone quiet
Multiple assignees that filed steadily in earlier years show zero filings in the latest year, including year-over-year drops of -100% for some. That pattern is consistent with a field where core positions were staked out earlier and current activity is shifting toward newer or smaller entrants.
Based on recent-year momentum by assignee in this dataset.
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 aluminum extrusion for battery enclosures, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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 is filing, and where the openings sit
The ranking behind this page covers 100 companies, counted in records — it is the full set the data endpoint returns, not a curated top-50 or top-100 list.
Leader
29 records
leading assignee
A modest lead, not a lock
The top-ranked assignee holds 29 of the 821 records, roughly double the fifth-place count of 14. That gap is enough to matter competitively but far short of the kind of dominance that would force everyone else into narrow design-arounds.
Fifth place: 14 records; tenth place: 10 records.
Collaboration
9 pairs
co-assignee pairings
Co-filing is rare and concentrated
Only nine co-assignee pairs appear across the dataset, and the strongest pairing (a vehicle OEM and its light-metal subsidiary) reaches 8 shared records. Most filers here work alone rather than through joint development structures.
Second-strongest pairing reaches 3 shared records.
Geography
255 / 123 / 122
China / EPO / US filings
China leads receiving offices, but filing is genuinely multi-region
China accounts for 255 records at its receiving office, ahead of the EPO at 123 and the US at 122, with Germany, Austria and WIPO/PCT all contributing meaningful volume. A clearance search limited to one jurisdiction will miss a substantial share of the art.
Germany 51, Austria 46, WIPO/PCT 42.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Benteler Automobiltechnik GmbH | 0 | -100% |
| BRUHNKE ULRICH | 0 | — |
| Societa Italiana Progetti | 0 | — |
| Norsk Hydro ASA | 0 | -100% |
| Toyota Motor Corporation | 0 | — |
| WKW Erbsloeh Automotive GmbH | 0 | — |
| Constellium Singen GmbH | 0 | -100% |
| Aisin Keikinzoku Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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 figures above describe the field as filed; turning them into a filing or freedom-to-operate decision means going deeper on specific claims and specific competitors.
Map claims against your own design
Run your own profile geometry, alloy composition and joining method against the dense B21C/C22F/C22C core to see where overlap actually exists rather than assuming it from class shares alone.
Explore in Patsnap EurekaTrack the quiet incumbents
Several assignees with strong historical filing counts show zero activity in the latest year. Confirm whether that reflects a strategy shift, an M&A event, or simply publication lag before treating their portfolios as static.
Explore in Patsnap EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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
The leading assignee in this dataset holds 29 of the 821 records in scope, with the fifth-ranked assignee at 14 and the tenth at 10. The top 5 combined account for only 14.5% of all records, and the top 10 for 21.6%, which means leadership exists but is shallow rather than dominant. A long tail of smaller and single-filing entrants files the remainder, so competitive monitoring needs to extend well beyond the largest few names.
Filings rose from 19 in 2017 to a peak of 70 in 2020, then declined toward a midpoint of 32 in 2022. The most recent year shows only 8 records, but that figure is partial because publication typically lags filing by around 18 months. Taken together, the multi-year pattern before the most recent year points to a field that has flattened rather than one still accelerating.
The largest share, 25.3% of the 821 records, sits in B21C, the metal extrusion and drawing classification, covering profile-forming methods. Close behind are C22F (non-ferrous metal treatment, 22.0%) and C22C (alloys, 19.7%), which together show that alloy composition and post-extrusion treatment are claimed almost as heavily as the extrusion process itself. Vehicle-specific classes such as B62D and B60R appear at lower shares, meaning most of the claim density is in materials and process rather than body-integration engineering.
Friction stir welding shows up in this dataset's search criteria because it is a common joining method for turning extruded aluminum profiles into a sealed, leak-tight battery tray or enclosure. Filings combining extrusion claims with leak-tightness or crash-load-path language often specify friction stir welding as the joining step between extruded sections. It matters for freedom-to-operate review because weld-parameter claims can sit alongside alloy and geometry claims on the same enclosure design.
The lower-share IPC classes relative to the B21C/C22F/C22C core, such as B21D (sheet-metal working) and B23P (general metal working), point to adjacent process steps that are less densely claimed. Specific sub-areas worth a closer look include post-extrusion surface treatment for corrosion resistance, crash load-path optimisation at profile joints, friction-stir weld parameter control for leak tightness, and temper selection tuned to wall thickness. None of these are unclaimed, but they carry noticeably less filing density than the alloy-and-extrusion core.
Answers are grounded in the same dataset. Derived from a Patsnap search on Aluminum Extrusion for Battery Enclosures 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 Aluminum Extrusion for Battery Enclosures in depth with Eureka
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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.