Lithium Iron Phosphate Battery Safety Patent Landscape 2026
- 23 families, no runaway filer. the strongest co-assignee pair appears just twice — this is still an open field, not one owned by a dominant player.
- Filing has already peaked. 2021 was the high point at 5 families; the 2022 midpoint holds at 5, and the curve since reads flat to declining, not accelerating.
- China leads filing location by a wide margin. 11 of the tracked families route through China's receiving office, versus 7 for the US and 3 for the EPO.
What this landscape covers
This landscape tracks patent families at the intersection of lithium iron phosphate (LFP) chemistry and battery safety engineering — thermal runaway prevention, overcharge protection and venting design — restricted to core battery IPC classes (H01M10/42, H01M50/50, H01M10/48). It is a narrow, purpose-built slice: 23 published families between 2015 and mid-2026, not the whole LFP or battery-safety universe.
Because publication lags filing by roughly 18 months, the 2025-2026 count is understated and should not be read as a drop-off yet. The picture that does hold up: filing activity crested in 2021 and has not exceeded that level since, while the applicant base remains fragmented rather than consolidated around one or two repeat filers.
Filing trend and technology mix
Two views of the same 23-family dataset: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend: a 2021 peak, not a ramp
Filings rose from zero in 2017 to a peak of 5 families in 2021, held at 5 through the 2022 midpoint, and have not broken above that level since. Read against the 18-month publication lag, the tail years understate true activity, but even generously interpreted this is a plateau, not a growth curve.
IPC composition: safety claims dominate, adjacent fields are thin
All 23 families sit in H01M (batteries, cells & fuel cells), as the search scope requires. The next-largest subclass, G01R (electric & magnetic measurement), appears in only 5 families, and A62C (fire-fighting), C08G (condensation polymers) and G06F (digital data processing) each appear in just 3. That drop-off from 23 to single digits shows how concentrated the claim language is on the core cell/pack safety mechanism itself, with measurement, materials and software framing still lightly claimed.
Go deeper on Lithium Iron Phosphate Battery Safety and Protection with Eureka
This page is one run against one query. Ask Eureka your own question about lithium iron phosphate battery safety and protection and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing
Battery pack, method and vehicle
The invention provides a battery pack, a method and a vehicle. The battery pack battery has a cell group. The cell group comprises a lithium iron phosphate cell and a ternary lithium-ion cell, wherein the lithium iron phosphate cell and the ternary lithium-ion cell are arranged in series with each another.Filed by NIO Technology (Anhui) Co., Ltd, published 2022-07-14.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20220013807A1 | Dendrite-Free, Wide Temperature Range Lithium Metal Batteries Enabled by Hybrid Network Ionic Liquids | 14 |
| 2 | CN110828920A | 船舶磷酸铁锂电池系统及其热失控防控方法 | 9 |
| 3 | US20220223901A1 | Battery pack, method and vehicle | 8 |
| 4 | CN115882088A | 一种磷酸铁锂电池安全性评价方法、系统、设备及介质 | 4 |
| 5 | CN119050523A | 一种磷酸铁锂电池热失控的多级预警方法及系统 | 3 |
| 6 | US11848417B2 | Gel polymer electrolyte including crosslinked network of poss and peg, ionic liquid, and lithium salt, lithiu… | 3 |
| 7 | EP4027444A1 | Battery pack, method and vehicle | 2 |
| 8 | CN210984881U | 船舶磷酸铁锂电池系统 | 2 |
| 9 | CN110556595A | 储能用磷酸铁锂电池安全管理系统的质态失衡预测方法 | 2 |
Citation counts reflect influence within this searched corpus and favour older filings; they are not a measure of current commercial importance.
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 (9 of 9 rows); clicking a row searches Eureka by that number.
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Three cuts of the same dataset — geography, citation pattern and claim concentration — point at where the field is crowded and where it is not.
China is the primary filing venue
China accounts for 11 of the tracked families, roughly 1.5x the US total of 7 and well ahead of the EPO's 3. For a company deciding where enforcement risk concentrates, China is where the claim density is highest — and where freedom-to-operate checks matter most.
Influence skews toward the oldest filings
The most-cited record in the set, US20220013807A1 on dendrite-free wide-temperature electrolytes, sits well above the next tier. Citation counts in a searched corpus like this reward age, not present relevance, so treat the ranking as a map of prior art density rather than a leaderboard of current best practice.
Everything sits inside the core battery class
Every family in this set carries an H01M classification; the next-largest adjacent subclass, G01R, only reaches 5. That is a tight cluster: safety mechanism claims are being written directly against cell and pack architecture, with comparatively little claim activity in measurement, fire suppression or materials framing.
Collaboration is thin and mostly bilateral
Only 4 co-assignee pairs appear across 23 families, and the strongest of them — a state grid research institute paired with a university — appears just twice. This is not a field organised around joint ventures or consortia; most filings are solo efforts.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to lithium iron phosphate battery safety and protection, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| State Grid Jiangsu Electric Power Co., Ltd. Economic and Technology Research Institute | Southeast University | 2 |
| ZHENG YONGWEI | LI XIAOWEI | 2 |
| ZHENG YONGWEI | LI CHRISTOPHER | 2 |
| LI XIAOWEI | LI CHRISTOPHER | 2 |
The strongest pairing (state grid research institute + university, 2 families) is grid-infrastructure focused, not vehicle-OEM focused — a different risk profile from the automotive filers in the ranking.
Who is filing, and how active are they now
The named assignees in this set are automakers, a naval research institute, a grid-infrastructure research arm, a university and battery cell makers — a mixed field with no single repeat filer pulling ahead.
NIO Technology (Anhui)
NIO's tracked filing, a battery pack combining an LFP cell with a ternary lithium-ion cell in series, addresses a mixed-chemistry safety architecture rather than LFP alone. Momentum in the latest tracked year is flat.
State Grid Jiangsu Economic & Technology Research Institute
This is the strongest collaboration signal in the dataset, pairing a grid-side research institute with an academic partner. The focus reads as stationary storage safety rather than vehicle pack design, a distinct risk pool from automotive filers.
704 Research Institute, CSSC
Filing here targets shipboard LFP systems and thermal runaway control methods — a niche application context distinct from EV or grid storage, and one of the few naval-specific entries in the set.
Shanghai Ruijian New Energy Technology
A cell-maker presence in the ranking without recent-year activity showing yet, consistent with the broader plateau: publication lag means 2025-2026 filings from active manufacturers may not have surfaced.
| Assignee | Recent year | YoY |
|---|---|---|
| NIO Technology (Anhui) Co., Ltd. | 0 | — |
| State Grid Jiangsu Electric Power Co., Ltd. Economic and Technology Research Institute | 0 | — |
| The 704 Research Institute of China Shipbuilding Industry Corporation (CSIC) | 0 | — |
| Southeast University | 0 | — |
| Shanghai Ruijian New Energy Technology Co., Ltd. | 0 | — |
| ZHENG YONGWEI | 0 | — |
| LI XIAOWEI | 0 | — |
| LI CHRISTOPHER | 0 | — |
Where to take this
The dataset points at questions worth running down before committing a filing strategy or a design-around plan.
Check freedom-to-operate in China first
With 11 of 23 families routed through China's receiving office versus 7 in the US, a China-first FTO check will surface more of the relevant prior art than a US-only search.
Run a China FTO scanWatch the grid-storage / university pairing
The State Grid Jiangsu Institute + Southeast University collaboration is the only repeated co-filing pattern in the set. If stationary storage is your application, this pairing's future filings are worth tracking directly.
Track this collaborationRe-run the trend after the lag window closes
2025-2026 figures are understated by the ~18-month publication lag. A re-run in 12 months will show whether the 2021 peak was a ceiling or a temporary dip.
Set a re-run reminderCommon questions on LFP battery safety patents
This landscape tracks 23 patent families published between 2015 and mid-2026 within the defined scope of thermal runaway prevention, overcharge protection and venting design for lithium iron phosphate batteries. That count reflects a narrow search restricted to core battery IPC classes, not the entire LFP or battery-safety literature. Broader searches without the safety-specific claim terms would return a larger, less targeted set.
No — filing activity peaked in 2021 at 5 families and has not exceeded that level since, including at the 2022 midpoint, which also sits at 5. Because publication lags filing by around 18 months, the most recent one to two years will always look lower than they eventually turn out to be, but even accounting for that, this reads as a plateau rather than continued growth. Anyone using this as a market-entry signal should treat it as a mature, not accelerating, filing environment.
China, based on receiving-office volume: 11 of the 23 tracked families were filed there, compared with 7 in the United States and 3 at the EPO. That does not mean US or European filings are safe to ignore, but a China-first prior art and FTO search will surface the largest share of relevant claims before you commit engineering resources. India appears with 2 families, a smaller but non-zero signal worth a secondary check if you plan to manufacture or sell there.
The named assignees in this dataset span automotive (NIO Technology), grid infrastructure (State Grid Jiangsu Economic & Technology Research Institute), marine research (the 704 Research Institute of CSSC), academia (Southeast University) and cell manufacturing (Shanghai Ruijian New Energy Technology), among others. No single assignee dominates: the strongest co-assignee pairing appears in only 2 families, and most entities in the ranking show no filings in the latest tracked year. This is a fragmented field rather than one controlled by a small number of repeat filers.
US20220223901A1, assigned to NIO Technology (Anhui), claims a battery pack in which a lithium iron phosphate cell and a ternary lithium-ion cell are arranged in series within the same cell group. It is specific to that mixed-chemistry series architecture and to the vehicle context described in the claims, so it does not automatically block pure-LFP packs, parallel arrangements, or non-automotive applications such as stationary or marine storage. Anyone designing a mixed-chemistry pack in series should read the claim scope in full rather than relying on the abstract, since narrow architectural claims like this one are exactly the kind that a small design change can route around.
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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.