Solid-State Battery State Estimation Patent Landscape 2026
Toyota Motor Corporation commands the solid-state battery state estimation space with 26 of 44 total patent families, producing a level of concentration rare even in early-stage technical fields. The corpus is in active growth, with annual filing volume rising sharply from 2021 onward and the most recent periods expected to gain further records as publication lag resolves.
Toyota leads a highly concentrated field with a clear two-tier structure
Toyota Motor Corporation holds 26 patent families in solid-state battery state estimation, placing it far ahead of every other filer. Honda Motor Co., Ltd. is the only other applicant with more than two patent families, filing five. The remaining applicants each hold one or two families.
The top five filers account for 73% of the combined output of the hundred largest filers — an unusually high concentration for a technology still in its growth phase. The gap between Toyota and the second-ranked Honda is wide enough that no single challenger can close it quickly through organic filing alone.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Toyota Motor Corporation | 26 | |
| 2 | Honda Motor Co., Ltd. | 5 | |
| 3 | Geely Automobile Institute (Ningbo) Co., Ltd. | 2 | |
| 4 | Hyundai Motor Company | 2 | |
| 5 | China FAW Co., Ltd. | 2 | |
| 6 | Zhejiang Geely Holding Group Co., Ltd. | 2 | |
| 7 | State Grid Shandong Electric Power Co. Jimo Power Supply Company | 1 | |
| 8 | Hunan Kejian Energy Development Co., Ltd. | 1 | |
| 9 | Hanyang University Industry-University Cooperation Foundation | 1 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 10 | Panasonic Intellectual Property Management Co., Ltd. | 1 | |
| 11 | Central South University | 1 | |
| 12 | Mitsubishi Heavy Industries, Ltd. | 1 | |
| 13 | Shenzhen Guoyi Technology Development Co., Ltd. | 1 | |
| 14 | Taicang Akaxi Technology Co., Ltd. | 1 | |
| 15 | Factorial Inc. | 1 | |
| 16 | SHANDONG UNIV OF SCI & TECH | 1 | |
| 17 | Enpower (Peking) Inc. | 1 | |
| 18 | Dongfeng Motor Group | 1 |
Toyota’s dominant position, reinforced by strong coverage across battery cell, power supply, and measurement branches, suggests it has built a broad foundational estate. Any entrant must navigate this estate while identifying the adjacent branches where coverage is comparatively thin.
Filing counts for 2025 and 2026 are understated relative to their ultimate totals due to standard patent publication delays; the apparent recent softening should not be read as a real decline in activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual filings are rising and the technology mix is dominated by battery and power-supply branches
The filing trend and technology composition together reveal a field that is still expanding on a multi-year basis, with activity heavily anchored in core battery-cell and power-supply measurement classes and material-analysis and AI branches receiving comparatively little coverage to date.
Annual filing trend
Filings were low and uneven from 2017 through 2020 (one to three families per year), then climbed steadily from 2021 onward, reaching eleven families in 2024. The 2025 and 2026 figures are understated by publication lag and will revise upward as more applications publish.
↗ Hover for values · click a bar to ask EurekaTechnology composition
The H01M (batteries and cells) and H02J (power supply and grid systems) branches collectively dominate the composition, with G01R (electric and magnetic measurement) as the third pillar. The B60L (electric vehicle propulsion) branch reflects the automotive context of most filers. G01N (material analysis), G06F (digital data processing), and G06N (AI-based computing) each appear in only a handful of records, signalling under-served adjacent territory.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Regeneration method of all-solid-state battery, an…
A regeneration method of an all-solid-state battery includes a step of preparing an all-solid-state battery having a cathode that does not contain copper, and a step of executing overdischarge control of the all-solid-state battery. The overdischarge control is control of mitigating reaction variance that is variance in electrode reaction due to charging… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | All-solid-state battery system | 21 |
| 2 | Battery system and vehicle on which battery system… | 20 |
| 3 | Control device of all-solid-state battery | 13 |
| 4 | Calculation device and all-solid-state battery sys… | 6 |
| 5 | Method of evaluating all-solid-state battery | 5 |
| 6 | All-solid-state battery system | 4 |
| 7 | All-solid-state battery system | 4 |
| 8 | 一种应用于新能源的高效固态电池储能热管理系统 | 3 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
The combination of high concentration, a growth-stage lifecycle, thin coverage in AI and materials-characterisation branches, and an automotive-led collaboration ecosystem shapes where new entrants and incumbents alike should focus attention.
Growth stage with annual volume still rising
PatSnap Eureka classifies this field as Growth, with annual filings still rising and the most recent years understated by publication lag. The 283% multi-year growth rate confirms that this is not yet a mature, densely contested space. Early movers who build estate now will benefit from the widest available claim space before the field crowds.
Lifecycle: GrowthOne dominant filer, a thin second tier, many single-family entrants
Toyota’s 26 patent families represent more than half the entire corpus. Honda sits alone in a narrow second tier with five families. All remaining filers hold one or two families each. This structure means that licensing or collaboration discussions with Toyota are likely unavoidable for any player seeking broad freedom to operate in this domain.
High concentrationHyundai–Kia and Geely group partnerships are the active co-filing pairs
The most active co-filing relationships pair Kia Corporation with Hyundai Motor Company (two co-filed families) and Zhejiang Geely Holding Group with Geely Automobile Institute (Ningbo) (two co-filed families). Hanyang University has collaborated with both Kia and Hyundai on one family each, indicating a university-OEM bridge in the Korean cluster. Toyota and Honda show no co-filing within this corpus, suggesting both pursue independent estate-building strategies.
OEM-led co-filingJapan and China lead; US coverage is substantial; Korea and Europe remain thin
Japan leads with sixteen patent records, followed closely by China with fifteen and the United States with thirteen. South Korea, EPO, and WIPO collectively account for only four records, pointing to potential prosecution gaps for applicants who have not yet extended filings into those jurisdictions. For new entrants, South Korea and EPO may represent relatively accessible prosecution routes with limited incumbent density.
JP · CN · US dominantGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Kia Corporation | Hyundai Motor Company | 2 |
| Zhejiang Geely Holding Group Co., Ltd. | Geely Automobile Institute (Ningbo) Co., Ltd. | 2 |
| Kia Corporation | 汉阳大学校产学协力团 | 1 |
| Hyundai Motor Company | 汉阳大学校产学协力团 | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Toyota is the clear anchor; Honda enters as the sole meaningful challenger
Two Japanese OEMs define the competitive hierarchy. Toyota’s estate spans all three primary technical branches, while Honda concentrates on power-supply and battery-cell branches. Both are classified as new entrants in terms of momentum trajectory, reflecting that this specific sub-field is itself newly active rather than long-established.
Toyota Motor Corporation
Toyota holds 26 patent families — more than five times any other applicant — with its strongest technical focus in H01M (batteries and cells, 26 records), H02J (power supply and grid systems, 21 records), and G01R (electric and magnetic measurement, 8 records). Its momentum trend is classified as a new entrant, consistent with the field’s own recent emergence. The breadth across all three core branches suggests Toyota is pursuing a foundational blocking position rather than a narrow niche.
26 patent familiesHonda Motor Co., Ltd.
Honda holds 5 patent families, placing it as the sole filer in the second tier. Its emphasis falls on H02J (power supply and grid systems, 5 records) and H01M (batteries and cells, 4 records), with additional coverage in H01M 50. Like Toyota, Honda’s momentum is classified as a new entrant, indicating concentrated recent activity. Its narrower scope compared to Toyota leaves room for targeted differentiation in measurement and diagnostics branches.
5 patent families| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Toyota Motor Corporation | 15 | ▲ new entrant |
| Honda Motor Co., Ltd. | 4 | ▲ new entrant |
Material characterisation, digital processing, and AI modelling are under-served adjacent branches
Three IPC branches appear in only two patent records each across the entire corpus, placing them well below the dominant battery-cell and power-supply branches. Each has plausible technical relevance to state estimation and merits closer examination before concluding that the low count reflects low value rather than low attention.
G01N · Material analysis and testing
With only two patent records, material-characterisation methods — such as impedance spectroscopy, X-ray diffraction, or electrochemical analysis applied to solid electrolytes — are sparsely covered relative to system-level estimation approaches. For researchers developing in-situ or operando diagnostic techniques that feed state estimators, this branch represents an under-served adjacent area. An entry path exists through the Kia, Hyundai, and Hunan Kejian filings that already touch G01N, which could inform a differentiated filing strategy.
Search this in Eureka →G06N · Computing based on AI models
AI-based computing methods appear in only two patent records, even though neural-network and physics-informed machine learning approaches to battery state-of-charge and state-of-health estimation are an active research direction in the broader lithium-ion literature. The sparse coverage here may reflect that practitioners have not yet systematically filed AI-specific claims for the solid-state context. Entrants with strengths in model-based or data-driven estimation algorithms could find relatively open territory in this branch.
Search this in Eureka →How leading applicants differ by technology branch emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 10 · Batteries, cells & fuel cells | H02J 7 · Power supply & grid systems | G01R 31 · Electric & magnetic measurement | B60L 58 · Electric vehicle propulsion | B60L 53 · Electric vehicle propulsion |
|---|---|---|---|---|---|
| Toyota Motor Corporation | Strong · 26 | Strong · 21 | Moderate · 8 | Moderate · 6 | Emerging · 5 |
| Honda Motor Co., Ltd. | Strong · 4 | Strong · 5 | Absent | Emerging · 1 | Emerging · 1 |
| Geely Automobile Institute (Ningbo) Co., Ltd. | Strong · 2 | Absent | Strong · 2 | Strong · 2 | Absent |
| Zhejiang Geely Holding Group Co., Ltd. | Strong · 2 | Absent | Strong · 2 | Strong · 2 | Absent |
| China FAW Co., Ltd. | Strong · 1 | Strong · 1 | Strong · 1 | Strong · 1 | Strong · 1 |
| Hyundai Motor Company | Strong · 2 | Absent | Strong · 2 | Absent | Absent |
Frequently asked questions
PatSnap Eureka identifies 44 patent families in scope for solid-state battery state estimation. Filing activity has grown sharply since 2021, and the most recent filing years will gain additional records as patent applications clear the standard publication delay.
Toyota Motor Corporation leads with 26 patent families — more than five times the count of the next-ranked applicant. Honda Motor Co., Ltd. is the sole second-tier filer with five families. All other identified applicants hold one or two families each.
PatSnap Eureka classifies the field as Growth. Annual filings are still rising, with the most recent years understated by publication lag. The multi-year growth rate across the corpus is 283%.
Japan leads with 16 patent records, followed by China with 15 and the United States with 13. South Korea holds 2 records, while EPO and WIPO each account for 1 record, indicating limited but non-zero international prosecution outside the three main offices.
The most active co-filing pairs are Kia Corporation with Hyundai Motor Company (2 co-filed families) and Zhejiang Geely Holding Group with Geely Automobile Institute (Ningbo) (2 co-filed families). Hanyang University has co-filed with both Kia and Hyundai on one family each. Toyota and Honda show no co-filing activity within this corpus.
G01N (material analysis and testing), G06F (electric digital data processing), and G06N (computing based on AI models) each appear in only two patent records across the corpus, compared to 39 records in H01M and 33 in H02J. These branches may represent areas where differentiated technical contributions face less established prior art.
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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.
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