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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/sodium-ion-cell-design-for-grid-and-start-stop-duty-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Emerging Battery ChemistriesSodium-ion cell design patents for grid storage and start-stop duty
- Concentration is shallow. the top 5 assignees hold just 31.8% of all 22 records in scope, and the top 10 combined reach only 54.5% — most of the field is single-filing entrants.
- Filing has already peaked. activity climbed to 10 records in 2024 before the trend flattened, with the 2022 midpoint sitting at just 1 record.
- Claims cluster on cells, not systems. H01M battery/cell classes cover 72.7% of records and H02J grid-power classes cover 54.5%, while vehicle, lighting and cycle-accessory integration each sit at 4.5%.
22
Published Records
32%
Top-5 Share of All Records
+900%
Filing Growth 2021→2024
CN
Leading Jurisdiction
Filing growth compares 2021 (1 records) with 2024 (10) — 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 22 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This review tracks 22 published patent families matching sodium-ion cell design language combined with grid, transport, low-temperature discharge, cycle-life or LFP-comparison claim terms. Every record in scope was filed through a China receiving office, which frames this as a snapshot of a domestic filing wave rather than a globally distributed one. The scope spans 2015 through the 2026-07-31 data cut-off, though the most recent year is necessarily partial.
Because publication typically lags filing by around 18 months, the 2025 and 2026 figures in the trend line understate real filing activity for those years. Read the 2024 peak as the clearest full-year signal currently available, and treat anything after it as a floor, not a ceiling.
Filing activity, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty 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
Two views of the same 22 records: how filing activity has moved over time, and which IPC subclasses the claims actually sit in.
A flat-to-declining curve after a 2024 peak
Filing moved from zero in 2017 to a peak of 10 records in 2024, but the 2022 midpoint recorded just 1 filing, meaning growth across the window has been uneven rather than steadily compounding. The most recent year (2026) is partial and will understate final volume once publication catches up.
Cell-level claims dominate; system integration is thin
H01M (batteries, cells and fuel cells) appears on 72.7% of the 22 records and H02J (power supply and grid systems) on 54.5%, confirming this is primarily a cell-and-grid-interface field. Measurement (G01R, 18.2%) has a real foothold; fire safety, EV propulsion, cycle accessories and lighting each appear on a single record (4.5%), marking them as edge applications rather than filing centers. Since records can carry multiple classes, these shares sum past 100% by design.
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%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and most-cited records
Representative Record
CN121425037A — power battery system for a heavy-duty new-energy commercial vehicle
安徽江淮汽车集团股份有限公司
Filed by Anhui Jianghuai Automobile Group (JAC), this record describes a power battery system pairing sodium-ion battery packs in series with parallel LFP battery packs, switched through a battery disconnect unit (BDU) under battery-management-system control based on available SOC and cell temperature. The stated aim is improving low-temperature environmental adaptability for heavy commercial vehicles.Dated 2026-01-30 — among the most recent filings in scope.
Most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN119853229A | 基于电芯单体容量修正的钠离子电池组均衡方法及系统 | 1 |
| 2 | CN217182962U | 一种飞轮与钠离子电池的复合储能系统 | 1 |
Citation counts inside this corpus favor older records simply by virtue of having had more time to accrue citations — treat them as a signal of influence, not current relevance.
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 (2 of 2 rows); clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty 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
Three read-throughs from the assignee, technology and timing data — useful for deciding where to file and where the field is already crowded.
Concentration
31.8% / 54.5%
top 5 / top 10 share of 22 records
No single owner controls the field
The leader holds only 2 of the 22 records in scope, and even the combined top 10 assignees reach just over half of all filings. This is a field of many small, defensive filers rather than one dominated by a handful of blocking portfolios.
Ranking covers 28 companies total
Timing
10 in 2024
peak-year filings, up from 1 in 2022
Activity has already crested
Filing rose unevenly to a 2024 peak before flattening. Because publication lags filing by roughly 18 months, 2025–2026 figures will rise as more records surface, but the underlying shape — a spike rather than sustained compounding growth — is unlikely to reverse.
2026 figure is partial
Claim geography
72.7% H01M
share of records touching battery/cell claims
Cell-level claim space is the densest
Battery and cell claims (H01M) and grid-power claims (H02J) together account for most filing activity, while integration into vehicles, lighting or cycle equipment remains claimed by single records each — signaling those application layers are still open rather than occupied.
Shares sum past 100% — records carry multiple IPC classes
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 sodium-ion cell design for grid and start-stop duty, 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 Cell Design for Grid and Start-Stop Duty 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 what they are not yet claiming
The assignee base is wide and shallow: a small lead position, a modest second tier, and a long tail of single-record filers spanning research institutes, state grid entities and automakers.
Leader position
2 records
held by the top-ranked assignee
A narrow lead, not a moat
The top-ranked assignee holds only 2 of the 22 records in scope — enough to lead the ranking, but far short of a blocking position. Fifth place already drops to 1 record, and tenth place holds 1 as well, showing how quickly the ranking flattens.
28 companies ranked in total
Institutional mix
State grid & rail research
entities present in the filer base
Utility and rail research bodies are active filers
Beyond battery makers, the filer base includes a state grid power supply company and rail-sector research and testing entities, reflecting sodium-ion's pull for grid storage and railway auxiliary power rather than purely EV-driven demand.
Co-assignee pairs: 10 identified
Momentum
1 filing
latest-year filing by the most active recent filer
Recent-year activity is thin across the board
Among tracked assignees, latest-year filing counts are mostly zero, with one university-linked filer showing a single filing in the latest year. No assignee shows sustained latest-year momentum, consistent with the post-2024 flattening seen in the overall trend.
YoY changes are small on a low base
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Chongqing University of Technology | 1 | — |
| Liaoning Starry Sky Sodium Battery Co., Ltd. | 0 | — |
| Jiangsu Zhitai New Energy Technology Co., Ltd. | 0 | — |
| Qingdao Haifa Environmental Protection Industry Holdings Co., Ltd. | 0 | -100% |
| Changjiang Institute of Survey, Planning, Design and Research Co., Ltd. | 0 | — |
| Tieke Jinhua Technology Co., Ltd. | 0 | — |
| Tieke Jinhua Testing Center Co., Ltd. | 0 | — |
| Ordos Carbon Neutrality Research and Application Co., Ltd. | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty 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
This landscape identifies the shape of the field. Turning it into a filing or freedom-to-operate decision requires drilling into specific claims.
Map claim scope on the leading records
Concentration is shallow here, but the specific independent claims on the top-held records still define what a new filing must design around, particularly in the dense H01M and H02J classes.
Explore claims in EurekaTrack the white-space branches
Vehicle integration, cycle accessories, fire safety and lighting each carry a single filing — worth monitoring for the next entrant rather than assuming they stay open.
Set up monitoring in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty 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 cell design patents
The dataset behind this landscape ranks 28 companies across 22 published patent families, all filed through a China receiving office. The leader holds only 2 records, and the top 5 combined account for 31.8% of all 22 records in scope, so no single filer controls the space. This points to an early-stage, fragmented field rather than one with an established gatekeeper.
Not steadily. Filing rose from zero in 2017 to a peak of 10 records in 2024, but the 2022 midpoint recorded just 1 filing, showing the growth was uneven rather than compounding year over year. Because publication lags filing by roughly 18 months, the 2025 and 2026 figures will likely rise as more records surface, but the overall shape looks like a spike that has already crested rather than a sustained climb.
CN121425037A, filed by Anhui Jianghuai Automobile Group (JAC) and dated 2026-01-30, describes a power battery system that pairs sodium-ion battery packs in series with parallel lithium iron phosphate (LFP) packs, switched by a battery disconnect unit under battery-management-system control based on state of charge and cell temperature, aimed at improving low-temperature adaptability in heavy commercial vehicles. Anyone designing a dual-chemistry pack switching architecture for cold-climate heavy vehicles should review its claim scope closely, since it sits among the most recent filings in this dataset. It is a useful reference point for how sodium-ion and LFP are being combined rather than treated as competing chemistries.
Application-layer integration is the clearest gap: electric vehicle propulsion integration, cycle and e-bike accessory mounting, fire-suppression system integration, and non-portable lighting power interfaces each appear on only a single record in this 22-record dataset. The core cell chemistry and grid-interface claim space (H01M and H02J classes) is far more heavily claimed, at 72.7% and 54.5% of records respectively. A first mover into one of these thinly-claimed application layers would face comparatively little prior art to design around, though that also means limited precedent to build on.
All 22 records in this scope were filed through a China receiving office, reflecting the search construction and the concentration of near-term commercial sodium-ion activity — including grid storage and rail auxiliary power projects — within Chinese state grid entities, automakers and research institutes. This does not necessarily mean sodium-ion cell design activity is absent elsewhere; it means this particular dataset, built around this search string and date range, surfaced only China-filed records. Broader geographic coverage would require widening the search terms or jurisdictions.
Answers are grounded in the same dataset. Derived from a Patsnap search on Sodium-Ion Cell Design for Grid and Start-Stop Duty 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.