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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/sodium-ion-battery-quality-control-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Updated 2026Sodium-Ion Battery Quality Control Patents: Filing Trends and Who Owns the Grading Claims
- Filing activity has plateaued, not accelerated. The 2022 midpoint (51 families) already sits close to the 2024 peak (76), and momentum at several leading filers has dropped sharply in the latest year.
- One family dominates citation influence. A 2008-era lithium/sodium iron fluorophosphate cathode filing draws far more citations than any capacity-grading or in-line-inspection filing that followed it.
- Cathode-adjacent chemistry outweighs test methodology in claim volume. C01G and C01B compound classes carry more filings than the measurement-specific G01R class, meaning most 'quality control' claims are anchored to material composition, not to instrumentation.
480
Published Records
70%
Top-5 Share of All Records
+300%
Filing Growth 2021→2024
EP
Leading Jurisdiction
Filing growth compares 2021 (19 records) with 2024 (76) — 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 480 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Field Overview
What sodium-ion battery quality control patenting actually covers
Sodium-ion battery quality control, as claimed across this dataset, spans cell testing, in-line inspection and capacity grading methods layered on top of sodium-ion cell and cathode chemistry. Most records are not pure test-equipment patents; they are cathode or electrolyte composition filings that fold a grading or inspection step into the claim to establish a manufacturing-quality tie-in. That pattern shows up directly in the IPC mix: H01M (batteries, cells and fuel cells) and C01G/C01B (metal and non-metallic inorganic compounds) dominate, while G01R (electric and magnetic measurement) — the class most associated with dedicated test instrumentation — accounts for a small fraction of filings.
That composition matters for freedom-to-operate work: a search limited to measurement and instrumentation classes will miss the majority of relevant prior art, because most quality-control claims in this space are written as method-of-manufacture or composition claims with an inspection or grading step attached, not as standalone test-equipment patents.
Filing volume by year, 2017-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Sodium-Ion Battery Quality Control 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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Filing & Classification Data
Filing trend and technology composition
480 patent families published between 2015 and mid-2026 make up this dataset, filed across six major receiving offices led by the EPO and the United States. The trend line and IPC breakdown below frame where activity has concentrated and where it has thinned out.
A plateau, not a ramp
Filings rose from 5 in 2017 to a peak of 76 in 2024, but the 2022 figure of 51 was already most of the way there — growth flattened well before the peak year, and the partial 2026 count (8, likely understated given publication lag) does not suggest a renewed climb.
Chemistry classes outnumber measurement classes
H01M carries 391 of 480 records and C01G and C01B together add 170 more, while G01R — the class most tied to dedicated measurement and electrical/magnetic sensing — holds only 7. Quality-control claims in this field are overwhelmingly chemistry-first.
Shares are the percentage of the 480 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 Sodium-Ion Battery Quality Control covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The filings shaping this landscape
Representative Recent Filing
A high safety sodium ion battery and its capacity grading method and application
BENAN ENERGY TECHNOLOGY (SHANGHAI) CO., LTD
Filed by BENAN ENERGY TECHNOLOGY (SHANGHAI) CO., LTD, this filing pairs a sodium-ion cell construction with a capacity-grading method and its downstream application, reflecting the dataset's dominant pattern of tying a grading or inspection step to a specific cell chemistry rather than claiming a generic test method.Publication date 2025-12-30 — near the edge of the dataset's coverage window, so its claim scope has not yet been tested by later filings.
View filing detailsMost-cited records in the corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080153002A1 | Mixed Lithium/Sodium Ion Iron Fluorophosphate Cathodes for Lithium Ion Batteries | 59 |
| 2 | WO2014009710A1 | Doped nickelate compounds | 35 |
| 3 | WO2014057258A1 | Doped nickelate compounds | 27 |
| 4 | US20150194672A1 | Doped nickelate compounds | 26 |
| 5 | WO2014009724A1 | Doped nickelate compounds | 26 |
| 6 | WO2014009722A1 | Doped nickelate compounds | 26 |
| 7 | US20180301696A1 | X/hard carbon composite material and method of preparing the x/hard carbon composite material | 23 |
| 8 | WO2022238985A2 | Electrolyte compositions | 22 |
| 9 | US20220069313A1 | Graphene-protected lithiophilic or nathiophilic metal anode for an alkali metal battery | 20 |
| 10 | WO2013140174A2 | Metallate electrodes | 20 |
Citation counts favour older filings simply by virtue of having had more time to be cited; treat this table as a map of influence, not of current commercial relevance.
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 Sodium-Ion Battery Quality Control 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 say about this field
Four patterns stand out once filing volume, citation weight and classification are read together.
Filing Trend
51 → 76
2022 to 2024 families
Growth flattened before the peak
The jump from 51 families in 2022 to 76 in 2024 looks like acceleration until you note that 2017's count was just 5 — most of the multi-year growth had already happened by the midpoint. The most recent partial year (8 in 2026) is not evidence of a slowdown by itself given publication lag, but it is not evidence of continued growth either.
Read the trend as plateaued pending the next 12-18 months of filings.
Citation Influence
59 citations
Top-cited record
Influence sits with a 2008-era cathode patent, not a QC method
The most-cited record in the corpus is a lithium/sodium iron fluorophosphate cathode filing from 2008, cited 59 times — well ahead of anything filed as a dedicated grading or inspection method. Several of the next most-cited records are also cathode composition filings (doped nickelate compounds), not test methodology.
Citation leadership here tracks cathode chemistry, not QC instrumentation.
Classification Mix
7 of 480
G01R (measurement) records
Measurement-class claims are a small minority
Only 7 of 480 records sit in G01R, the class built for electric and magnetic measurement. The overwhelming majority of 'quality control' claims are filed under battery/cell classes or inorganic-compound classes, with the QC step embedded as a method claim inside a chemistry patent.
Searching G01R alone would miss most of this landscape.
Collaboration
6 pairs
Co-assignee filings
Co-filing is rare and mostly academic-industry
Only six co-assignee pairs appear in the dataset. The strongest pairing links a battery materials company with an electronics manufacturer, while other pairings connect a US research university with another US research university, and a French national research body with a university — suggesting most collaboration here is either commercial-supply-chain or academic, with little cross-over between the two.
Co-filing volume is too thin to signal a consolidating ecosystem yet.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sodium-ion battery quality control, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Sodium-Ion Battery Quality Control 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
Who's Filing
Assignee landscape and recent momentum
Filing activity is led by a small number of specialist and diversified filers, several of which have pulled back sharply in the most recent tracked year — a signal worth separating from genuine field-wide decline given publication lag.
Momentum Leader
3 filings
Latest year, 0% YoY
One filer held steady while others pulled back
The leading filer in the latest tracked year posted 3 families with flat year-on-year momentum, in contrast to several other named filers whose latest-year counts dropped to zero.
Flat momentum here reads as resilience relative to peers.
Sharp Pullback
-90% YoY
One major Chinese cell maker
A steep drop from a high-volume filer
One of the dataset's more active assignees shows a 90% year-on-year decline in the latest tracked period, and a related entity in the same corporate family shows a full drop to zero — a pattern consistent with either a filing pause or a lag in publication rather than an abandoned program.
Treat single-year drops as provisional until the next data cut.
Zero-Activity Filers
0 in latest year
Multiple named assignees
Several historically active filers show no latest-year output
A number of assignees that have contributed meaningfully to the corpus — including a major electronics manufacturer and a national research organisation — show zero filings in the latest tracked year. Given the 18-month publication lag typical for this field, this is more likely a reporting gap than a full stop.
Watch the next 12-18 months before reading this as retreat.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Faradion Limited | 3 | 0% |
| Ningde Amperex Technology Limited (ATL) | 1 | -90% |
| Contemporary Amperex Technology Co., Ltd. (CATL) | 0 | -100% |
| Sharp Corporation | 0 | — |
| French National Centre for Scientific Research (CNRS) | 0 | — |
| ATLAS POWER TECHNOLOGIES INC | 0 | -100% |
| Hong Kong CATL New Energy Technology Co., Ltd. | 0 | -100% |
| Massachusetts Institute of Technology (MIT) | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Sodium-Ion Battery Quality Control 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
Next Steps
Where to take this analysis
The dataset points to specific follow-up work depending on whether you are scoping freedom-to-operate, tracking a competitor, or looking for open claim space.
Map claim scope against your own process
Run the capacity-grading and in-line-inspection claim language from the most-cited and most-recent filings against your own manufacturing test steps to spot overlap early.
Explore claims in EurekaTrack the momentum shift
Several leading filers show sharp year-on-year drops; confirm whether that reflects a real pullback or a publication-lag gap before making a competitive call.
Set up monitoring in EurekaScope the under-claimed branches
Measurement-class filings are thin relative to chemistry claims — sub-areas like non-destructive capacity-fade sensing warrant a dedicated novelty search before drafting.
Run a white space search in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Sodium-Ion Battery Quality Control 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 sodium-ion battery QC patents
This dataset contains 480 published patent families filed between 2015 and mid-2026 that combine sodium-ion battery chemistry with cell testing, in-line inspection or capacity grading claims. That figure covers records filed across the EPO, the US, WIPO/PCT, India, China and Germany, and it will grow as more recent filings publish, since patent publication typically lags filing by around 18 months. Because families rather than raw document counts are used, the number reflects distinct inventions rather than duplicate filings across jurisdictions.
Growth has flattened rather than continued to accelerate. Filings rose from 5 in 2017 to a peak of 76 in 2024, but the 2022 count of 51 shows that most of the growth had already happened by the midpoint of the period, and the partial 2026 figure of 8 does not point to renewed acceleration. Anyone using this trend to justify a filing decision should treat the most recent one to two years as understated rather than as evidence of a slowdown, given normal publication lag.
Filing is led by a mix of specialist battery-materials firms, diversified electronics manufacturers, and academic or national research institutions, with momentum varying sharply between them in the most recent tracked year. Some leading filers have held steady, while others — including at least one major cell manufacturer — show year-on-year declines as steep as 90% or a full drop to zero. Co-assignee filing is rare, appearing in only six pairings across the whole dataset, so most activity is single-assignee rather than joint-venture driven.
SG10202401468RA is a Singapore filing from BENAN ENERGY TECHNOLOGY (SHANGHAI) CO., LTD, published 2025-12-30, titled 'A high safety sodium ion battery and its capacity grading method and application.' It combines a specific sodium-ion cell construction with a capacity-grading method and a stated downstream application, following the dataset's dominant pattern of pairing a chemistry claim with a grading step rather than claiming a standalone test method. Because it sits near the edge of the coverage window, its practical claim scope has not yet been tested against later filings.
The clearest gap sits in dedicated measurement and instrumentation claims: only 7 of 480 records fall under G01R, the electric/magnetic measurement class, against 391 under H01M and 170 combined under the C01G and C01B compound classes. That imbalance suggests under-claimed territory in areas like non-destructive capacity-fade sensing, in-line electrode thickness inspection, and impedance-based automated cell sorting — branches that are logically necessary for manufacturing quality control but are thinly represented as standalone claims rather than embedded method steps inside chemistry patents.
Answers are grounded in the same dataset. Derived from a Patsnap search on Sodium-Ion Battery Quality Control 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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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.