Sodium-Ion Battery Safety Patents: Who Leads, Where Gaps Remain 2026
- Only 14 families worldwide. filing activity peaked in 2021 at five records and has not repeated that level since, with the midpoint year showing no filings at all.
- China dominates the filing venue, with seven of the tracked records filed there against three in the United States and two at the EPO.
- Cross-domain claims are rare, with fire-fighting, AI-based prediction and grid-power integration each appearing in only one record apiece alongside the core battery IPC class.
A narrow, recently active corner of battery-safety IP
Sodium-ion battery safety and protection patenting is a small field by patent-count standards: 14 families across roughly a decade of possible filing activity, concentrated almost entirely within the core battery IPC class H01M. The filing history is uneven rather than steadily rising — a peak of five records in 2021 was not sustained, and the following year produced none at all, which points to a field still forming around specific problems rather than following a smooth adoption curve.
Because publication typically lags filing by around 18 months, the most recent filing years in this dataset understate real activity; applications from 2025 and 2026 will keep surfacing in searches for some time. Read the trend as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 14-family dataset: how filings moved year over year, and which IPC subclasses the claims actually sit in.
An uneven filing curve, not a steady ramp
Filings rose to a peak of five in 2021, then dropped to zero at the 2022 midpoint before intermittent activity resumed. That pattern is more consistent with a handful of applicants responding to specific safety incidents or standards pushes than with a maturing, continuously invested field.
Battery class dominates; safety-adjacent classes barely register
H01M accounts for 13 of 14 records, confirming this is fundamentally a battery-construction dataset with safety framing layered on top. H02J appears in seven records, suggesting a meaningful share of the claims tie protection functions to power-supply or grid-interface design rather than to the cell alone. Fire-fighting (A62C), digital processing (G06F) and AI-based modelling (G06N) each appear exactly once — thin enough that none can be called an established sub-field yet.
Shares are the percentage of the 14 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Sodium-Ion Battery Safety and Protection with Eureka
This page is one run against one query. Ask Eureka your own question about sodium-ion battery safety and protection and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN121835351A | 一种基于仿真数字孪生的钠离子电池储能系统健康状态动态预测方法 | 2 |
| 2 | WO2021161044A1 | Sodium-ion battery pack | 2 |
| 3 | US20240234796A1 | Sodium-ion battery pack | 1 |
Citation counts are drawn from a corpus of only 14 families, so a single citation carries more weight here than it would in a larger field; treat the ranking as directional.
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. Publication numbers are shown where the record carries one (3 of 3 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the filing pattern says about the state of the art
With only 14 families to work from, conclusions have to stay close to what is actually filed rather than extrapolate a trend line.
Activity is episodic, not compounding
A single peak year followed by a flat-to-zero midpoint suggests filings cluster around specific triggers — a safety incident, a standards deadline, a product launch — rather than reflecting continuous R&D investment across many applicants.
China is the primary filing venue by a wide margin
Half the dataset was filed in China, with the US, EPO, Australia and WIPO splitting the remainder. For counsel assessing freedom to operate outside China, the enforceable prior art base thins out quickly.
Safety claims are still framed as battery claims
Almost every record sits in the core battery-construction IPC class rather than in a dedicated protection-circuit or fire-safety class, meaning safety mechanisms are typically claimed as part of the cell or pack design rather than as standalone protection systems.
Almost no joint filing activity
Only one co-assignee pairing appears in the dataset, between a battery electrolyte materials firm and a university partner. Collaborative filing is not yet a pattern here — most applicants are filing solo.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery safety and protection, with the prior art for and against each one.
Who is filing, and how active are they right now
The assignee set is small and, based on the most recent tracked year, largely inactive — several named filers show zero activity in the latest year and year-over-year declines of 100%.
Recent-year momentum has stalled across the board
Every assignee surfaced in the recent-momentum data shows zero filings in the latest tracked year, and two show a full year-over-year drop from prior activity. None of the named filers is currently accelerating.
Domestic Chinese filers anchor the dataset
The receiving-office split, combined with the assignee names in the dataset, points to Chinese battery-materials and energy-technology firms as the core filer base, with international pack-level claims (WO, US) filed by a smaller separate set.
Materials suppliers and academia show an early link
The one identified co-assignee pair links a battery electrolyte materials manufacturer with a university, hinting that materials-side safety work (electrolyte stability, thermal behaviour) is where academic collaboration is starting to appear.
| Assignee | Recent year | YoY |
|---|---|---|
| Faradion Limited | 0 | — |
| SVOLT Energy Technology Co., Ltd. | 0 | -100% |
| Zhuhai Saiwei Electronic Materials Co., Ltd. | 0 | — |
| Shenzhen Capchem Technology Co., Ltd. | 0 | — |
| Jiangsu Zhongna Energy Technology Co., Ltd. | 0 | — |
| Wuxi Anna Energy Technology Co., Ltd. | 0 | -100% |
| Electric Power Research Institute of Guangxi Power Grid Co., Ltd. | 0 | -100% |
| Guangdong Highpower New Energy Co., Ltd. | 0 | -100% |
Where to take this analysis
A 14-family dataset is small enough to review claim-by-claim rather than by statistics alone.
Check the cited records against your own claims
The top-cited pack-level filings (WO2021161044A1 and its US counterpart) are the closest thing this field has to anchor prior art. Any pack-architecture safety claim should be checked against them first.
Run a claim comparisonWatch the under-claimed digital-monitoring branch
Digital-twin and AI-based state prediction appear only once each in this dataset but sit adjacent to a fast-growing battery-management-systems field elsewhere. Early filers here face little direct prior art.
Explore adjacent filingsTrack China-first filings before they enter other jurisdictions
With half the dataset filed only in China and publication lagging filing by roughly 18 months, monitoring Chinese filings early gives the longest runway before equivalent claims appear in the US or EPO.
Set up filing alertsCommon questions on sodium-ion battery safety patents
This dataset identifies 14 patent families published between 2015 and mid-2026 that combine sodium-ion battery terminology with safety, overcharge-protection or thermal-runaway-prevention language and sit within the relevant protection-circuit and battery-construction IPC classes. That is a small field compared to sodium-ion battery chemistry patenting overall, which suggests safety and protection is still a specialised sub-topic rather than a mainstream filing category. Because publication lags filing by roughly 18 months, the true count for 2025 and 2026 will be higher than currently visible.
The dataset shows five filings in 2021, the highest single-year total, followed by zero filings at the 2022 midpoint. Patent filing spikes like this typically follow a specific trigger — a safety incident, a new commercial product entering the market, or a regulatory deadline — rather than reflecting steady R&D investment. A single flat or down year in a 14-family dataset is not necessarily a sign of declining interest; it may just as easily reflect the small sample size and the reporting lag inherent in patent publication.
China is the dominant filing venue in this dataset, with seven of 14 records filed there, roughly half the total. The United States accounts for three records, the European Patent Office for two, and Australia and the WIPO PCT route one each. This venue split suggests that companies developing sodium-ion safety technology in China are largely filing domestically first, with a smaller subset pursuing international protection through PCT or direct EPO/US filings.
The core class is H01M, covering batteries, cells and fuel cells, which appears in 13 of the 14 records. H02J, covering power supply and grid systems, appears in seven records, indicating meaningful overlap between cell-level protection and power-delivery or grid-interface design. Fire-fighting (A62C), general digital data processing (G06F) and AI-based modelling (G06N) each appear in only a single record, marking them as emerging rather than established overlaps worth watching for future filing growth.
Collaboration appears minimal in this dataset: only one co-assignee pairing was identified, linking a battery electrolyte materials manufacturer with a university research partner. The great majority of the 14 tracked families were filed by a single assignee, which is typical for a young, narrowly defined technology area where companies are still establishing individual claim positions before entering joint development agreements.
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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.