Marine Battery Thermal Management Patents: Top Companies & Trends 2026
Filing growth compares 2021 (63 records) with 2024 (80) — 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 623 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape maps 623 published records matching thermal management systems for marine batteries — cooling, heat rejection and temperature control applied to electric and hybrid vessels, from small ferries to larger commercial hulls. The search string captures both purpose-built marine battery thermal management claims and adjacent battery-cooling art explicitly tied to ships, boats or ferries, so the corpus blends dedicated marine filings with automotive-derived battery cooling technology being pulled into marine applications.
Records span publication years 2015 through the 2026-07-31 data cut-off. Because publication typically lags filing by around 18 months, the most recent one to two years in any trend chart will understate actual filing activity and should not be read as a slowdown.
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Filing trend and technology composition
Two views of the same 623-record corpus: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend, 2017–2026
Filings rose from 35 records in 2017 to a peak of 129 in 2022, then continued at a high level through 2024 (80 records, up 27% from 63 in 2021). 2025 and 2026 figures are still filling in as publications catch up to filing dates.
IPC subclass composition
H01M (batteries, cells & fuel cells) appears in 64.0% of the 623 records, followed by B60L (electric vehicle propulsion) at 24.1% and H02J (power supply & grid systems) at 15.6%. Marine-specific classes B63H and B63B sit lower, at 9.8% and 5.8% respectively — records can carry multiple classes, so these shares sum to more than 100%.
Shares are the percentage of the 623 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electric & Hybrid Vessels: Marine Battery Thermal Management Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about electric & hybrid vessels: marine battery thermal management patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
WO2025184528A1 — Electric marine vessel and propulsion system
Electric marine vessel systems, other marine vessels systems, subsystems thereof, and other marine-vessel-related apparatuses, devices, and components, and methods of operating and implementing same, are disclosed. A described embodiment covers a propulsor with a propeller and motor-bearing primary structure, mounted on a marine vessel with a hull structure, deck structure and at least one adjustable structure.Filed by Flamingo Electric Inc., published 2025-09-04 — abstract trimmed for length.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20090139781A1 | Method and apparatus for an electrical vehicle | 515 |
| 2 | US6184656B1 | Radio frequency energy management system | 353 |
| 3 | US20040090195A1 | Efficient control, monitoring and energy devices for vehicles such as watercraft | 211 |
| 4 | US20160059733A1 | Battery thermal management system and methods of use | 153 |
| 5 | US20100062329A1 | Interconnection washer assembly for a battery assembly | 135 |
| 6 | US20180190960A1 | Systems and methods for battery structure, interconnects, sensing, and balancing | 132 |
| 7 | US20120298433A1 | Battery module, battery system, electric vehicle, movable body, power storage device, and power supply device | 93 |
| 8 | US20090246596A1 | Fuel cell system for charging an electric vehicle | 92 |
| 9 | US20180145382A1 | Systems and methods for battery thermal management utilizing a vapor chamber | 81 |
| 10 | US20200168959A1 | Active and passive battery pressure management | 76 |
Citation counts favour older records simply because they have had longer to accumulate citations within the searched corpus — treat them as a signal of influence, not of current relevance.
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Three read-throughs from the filing trend, the technology composition and the assignee spread.
Momentum held through the last complete filing year
Filings climbed from 63 records in 2021 to 80 in 2024, after peaking at 129 in 2022. That is sustained interest rather than a short spike, though 2025–2026 figures are not yet complete enough to read as continuation.
No single assignee dominates the field
The leading assignee holds 48 records, but the top 5 combined account for only 22.0% of the 623 records in scope, and the top 10 for 34.2%. That leaves a long tail of entrants with smaller filing counts each.
Battery-side claims dominate over vessel-side claims
H01M (batteries, cells & fuel cells) touches 64.0% of records, well ahead of B63H marine propulsion (9.8%) and B63B ships and marine vessels (5.8%). Most of the claimed innovation sits in the cell and pack, not the hull integration.
US and Europe lead receiving offices
The United States accounts for 243 records and Europe (EPO) for 134, with WIPO PCT filings at 76. China, India and the UK each sit well below that, suggesting the commercial centre of gravity for this art is still US/EU-led.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electric & hybrid vessels: marine battery thermal management patent landscape, with the prior art for and against each one.
Where to take this analysis
The landscape points to specific next steps depending on whether the goal is freedom-to-operate, R&D targeting or competitive tracking.
Check freedom-to-operate on vessel-side claims
With B63H and B63B claim density well below H01M's, a new hull-integrated cooling design may face less blocking prior art than a new cell chemistry would.
Explore in EurekaTrack the long tail of single-filing entrants
With ownership this fragmented past the top ranks, new entrants and licensing targets are easier to miss using ranking tables alone.
Explore in EurekaWatch 2025–2026 filings as they publish
Current-year figures will keep rising as publication catches up to filing dates; re-check the trend before concluding momentum has slowed.
Explore in EurekaCommon questions
This landscape identifies 623 published records matching marine battery thermal management and closely related battery-cooling art applied to ships, boats and ferries, covering publication years 2015 through the mid-2026 data cut-off. That figure counts records, and because publication lags filing by roughly 18 months, the most recent one to two years will keep growing as more filings publish. Family-level counting is used to avoid double-counting continuations and multi-jurisdiction filings of the same invention.
The assignee ranking covers 100 companies, with the leader holding 48 of the 623 records in scope — a meaningful position but far from a monopoly. The top 5 assignees combined account for only 22.0% of all records, and the top 10 for 34.2%, which points to a fragmented field rather than one dominated by a handful of firms. Anyone doing competitive tracking should watch the long tail as closely as the named leaders, since most filings sit outside the top ranks.
Filings rose from 35 records in 2017 to a peak of 129 in 2022, and the last complete filing year shows continued growth: 63 records in 2021 to 80 in 2024, up 27% over that span. Figures for 2025 and 2026 appear lower only because publication has not caught up with filing dates yet, not because activity has actually dropped. Any conclusion about a slowdown should wait for those years to fully publish.
H01M, covering batteries, cells and fuel cells, appears in 64.0% of the 623 records in scope, making it by far the densest claim area. B60L (electric vehicle propulsion) and H02J (power supply and grid systems) follow at 24.1% and 15.6%. Marine-specific classes such as B63H (marine propulsion and steering) and B63B (ships and marine vessels) are comparatively thin, at 9.8% and 5.8%, suggesting vessel-side integration is less crowded than cell-and-pack level innovation.
The gap between heavy claim density in H01M battery technology and much lighter density in the marine-specific classes (B63H, B63B) suggests vessel-side integration work — hull-integrated coolant routing, propulsion-linked thermal load balancing, and marine-specific enclosure sealing — is comparatively under-claimed. This does not mean the technology is unsolved, only that fewer patents currently occupy that claim space relative to core battery cooling. A freedom-to-operate check focused on those specific sub-areas is a reasonable first step before investing in vessel-side designs.
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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.