Charging Cable and Connector Cooling Patents: Who Leads 2026
- One assignee accounts for all 22 records in scope. Southwire Company, LLC holds 100% of the filings this dataset returns — there is no second filer to speak of.
- Filing peaked in 2017 and has not repeated that level since. 13 filings that year against a 2022 midpoint of 4, with the most recent year showing no new publications yet.
- Almost every record touches EV propulsion class B60L. 95.5% of the 22 records sit in B60L, with cable and conductor class H01B close behind at 77.3%.
What this landscape covers
Liquid-cooled charging cables move more current through a smaller conductor cross-section than air-cooled equivalents, which matters directly for cable weight and flexibility at the connector end. This landscape tracks 22 published records matching claims and abstracts around liquid-cooled charging cable systems, connector cooling and high-power charging cable design, filed between 2015 and the 2026 cut-off. The representative filing, US20170338006A1 “Liquid Cooled Charging Cable System”, describes a supply and return conductor immersed directly in a pumped coolant loop — a design that later filings in the set build on rather than replace.
Because publication lags filing by roughly 18 months, the apparent drop-off in the most recent years understates real filing activity rather than reflecting a genuine slowdown. The dataset is small enough that a single assignee's filing decisions move every headline figure, which is itself a finding worth reading carefully.
Filing trend and technology composition
22 records in scope, filed between 2015 and the 2026 data cut-off, classified across three dominant IPC subclasses.
Filing activity peaked early and has not recovered
Filings ran to 13 in 2017, the peak year so far, then eased toward a midpoint of 4 in 2022. The 2026 figure of 0 reflects the publication lag rather than a stop in R&D — cases filed in the last 18 months will not have published yet.
Three IPC subclasses carry almost the entire set
B60L (electric vehicle propulsion) appears in 95.5% of the 22 records, H01B (cables, conductors and insulators) in 77.3%, and H01R (connectors and current collectors) in 50.0%. Because records can carry more than one class, these shares add up to more than 100% of the record total — the overlap shows that most filings claim the cable, the coolant path and the connector together rather than any one component in isolation.
Shares are the percentage of the 22 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Charging Cable and Connector Cooling with Eureka
This page is one run against one query. Ask Eureka your own question about charging cable and connector cooling and every answer comes back with the patent numbers behind it.
Try EurekaThe filing that most of the set cites
US20170338006A1 — Liquid Cooled Charging Cable System
A liquid cooled charging cable system may be provided. The liquid cooled charging cable system may comprise a source, a load, a liquid cooled charging cable, and a cooling device. The liquid cooled charging cable may connect the source to the load, and may supply electric energy from the source to the load. The liquid cooled charging cable may comprise a supply conductor and a return conductor. The cooling device may pump a coolant around the supply conductor and the return conductor where the supply conductor and the return conductor may be immersed in the coolant.Filed by Southwire Company, LLC, published 2017-11-23. Cited 60 times within this dataset — the highest count of any record in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20170338006A1 | Liquid Cooled Charging Cable System | 60 |
| 2 | WO2017201017A2 | Liquid cooled charging cable system | 11 |
| 3 | US10811170B2 | Liquid cooled charging cable system | 7 |
| 4 | US20220212554A1 | Liquid Cooled Charging Cable System | 5 |
| 5 | US20200243221A1 | Liquid Cooled Charging Cable System | 4 |
| 6 | EP3459087B1 | Liquid cooled charging cable system | 4 |
| 7 | US11472304B2 | Liquid cooled charging cable system | 3 |
| 8 | CA3025028A1 | Liquid cooled charging cable system | 3 |
| 9 | EP3459087A2 | Liquid cooled charging cable system | 3 |
| 10 | US11760217B2 | Liquid cooled charging cable system | 2 |
Citation counts favour older filings in any searched corpus; treat this as a measure of influence within the dataset, not of current technical importance.
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Browse MCP servers →What the filing pattern tells you
A small, concentrated dataset with one dominant assignee and a peak that is nearly a decade old.
One assignee holds the entire ranked set
Southwire Company, LLC accounts for all 22 records in the assignee ranking. There is no second or third filer visible in this dataset, so the usual question of a leader versus a long tail does not apply here — the field is effectively a single filer's claim space.
Activity has not returned to its 2017 peak
Filings ran at 13 in 2017, the high point so far, eased to a midpoint of 4 by 2022, and show 0 published in the most recent year. Given the 18-month publication lag, recent-year figures should be read as a floor, not a ceiling, on actual filing activity.
Claims cluster on the vehicle-charging interface
Almost every record in scope sits in B60L (electric vehicle propulsion), with strong overlap into H01B (cables and conductors) and H01R (connectors). That overlap indicates filings are built around the whole cable-connector-coolant assembly rather than one isolated component.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to charging cable and connector cooling, with the prior art for and against each one.
Who is filing, and where the gaps sit
A single assignee dominates the ranked filings; the openings for new entrants sit in the sub-areas the claims have not yet crowded.
Southwire Company, LLC
Southwire's filings, led by the widely cited US20170338006A1, define the core architecture in this dataset: a supply and return conductor immersed together in a pumped coolant loop. Every other record in scope sits within this same assignee's portfolio.
No new publications in the most recent year
The leading assignee shows 0 filings published in the latest year on record. Combined with the publication lag, this does not confirm that filing activity has stopped — only that nothing from the last 18 months has surfaced yet.
Filing activity is concentrated in the United States
The United States accounts for the largest share of receiving offices at 11 records, followed by smaller counts through Canada, the EPO, WIPO/PCT, Austria and Denmark. That spread suggests protection is being sought in North America first, with selective international coverage rather than broad global filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Southwire Company, LLC | 0 | — |
Where to take this next
The dataset points to a narrow but active claim space built around one assignee's core architecture, with several adjacent sub-areas still open.
Check freedom-to-operate against the core coolant-loop claims
Before designing a liquid-cooled charging cable, review the claim scope of US20170338006A1 and its related filings directly rather than relying on the abstract alone — the immersed supply-and-return conductor design is the anchor claim most later work has to design around.
Explore the full filing set in EurekaWatch for renewed filing once the lag window closes
The 0 filings shown in the latest year reflect an 18-month publication lag more than a real stop in R&D. Re-check this landscape in the next reporting cycle to see whether filing activity picks back up.
Track filing trends in EurekaTest claims in the under-claimed sub-areas
Temperature sensing, coolant loop reliability and conductor cross-section reduction for megawatt charging show little dense coverage in this dataset. These are reasonable starting points for a differentiated first claim.
Search adjacent claim space in EurekaCommon questions on charging cable and connector cooling patents
In this dataset, Southwire Company, LLC accounts for all 22 published records in the assignee ranking, which is 100% of the field in scope. This is an unusually concentrated result compared with most patent landscapes, and it reflects the specific search scope used here rather than a claim that no other company works on cable cooling. Anyone assessing freedom to operate in this space should start by reviewing Southwire's core filings, particularly the widely cited US20170338006A1.
Liquid cooling lets a cable carry more current through a smaller conductor cross-section, because the coolant removes heat that would otherwise force a larger, heavier conductor to stay within thermal limits. The representative filing in this dataset, US20170338006A1, describes a supply and return conductor immersed directly in a pumped coolant, which is the architecture most later filings build from. This approach trades a sealed coolant loop and pump for reduced cable weight and improved flexibility at the connector end.
Filing in this dataset peaked in 2017 at 13 records, then declined toward a midpoint of 4 by 2022, with the most recent year showing no published filings yet. Because patent publication typically lags the actual filing date by around 18 months, the low recent-year figures likely understate real activity rather than showing a genuine halt in R&D. A clearer picture of the last two years will only emerge as those applications publish.
Almost all records in this dataset, 95.5% of 22, fall under IPC class B60L, which covers electric vehicle propulsion systems, with strong overlap into H01B for cables, conductors and insulators at 77.3% and H01R for connectors and current collectors at 50.0%. Because a single record can carry multiple IPC classes, these figures add up to more than 100% of the record total, which shows that most filings claim the cable, coolant path and connector as one integrated system rather than as separate components. This pattern is a useful signal for anyone deciding whether to file a component-only claim or a system-level claim.
Based on this dataset's classification pattern, sub-areas such as inline temperature sensing at the connector tip, coolant loop reliability under repeated thermal cycling and conductor cross-section reduction specifically for megawatt charging standards show comparatively little dense, dedicated claim coverage. These sit adjacent to the core immersed-conductor coolant loop architecture that dominates the existing filings. A first claim built around fault detection for coolant leaks or flexible jacket design at high flow rates would likely face less crowded prior art than a claim on the core cooling architecture itself.
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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.