Rechargeable Battery Technology Patent Landscape 2026
Rechargeable Battery Technology Patent Landscape in 2026
Rechargeable battery technology is a heavily concentrated, mature field: a small group of Korean and Japanese cell makers dominates the top of the applicant ranking, with LG Energy Solution holding the leading position by a wide margin. The field reached peak annual filing volume in 2022 and has since eased, consistent with a maturing innovation cycle, though the most recent years remain undercounted due to publication lag.
LG Energy Solution leads a concentrated field of Korean and Japanese incumbents
LG Energy Solution holds the top-ranked position by a substantial margin, followed by Samsung SDI, Toyota Motor Corporation, LG Chem, and Panasonic Holdings — all five of whom together account for 42% of the combined patent records of the hundred largest filers.
The gap between first and second place is large, and the top five are drawn entirely from Korea and. Japan, indicating a two-region oligopoly at the frontier of rechargeable battery IP. Chinese players, notably Contemporary Amperex Technology (CATL) and its affiliates, appear in the mid-tier but are growing in filing momentum.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | LG Energy Solution Ltd | 50,052 | |
| 2 | Samsung SDI Co Ltd | 20,247 | |
| 3 | Toyota Motor Corporation | 15,120 | |
| 4 | LG Chem Ltd | 12,038 | |
| 5 | Panasonic Holdings Corporation | 9,459 | |
| 6 | Panasonic Intellectual Property Management Co Ltd | 8,003 | |
| 7 | Sanyo Electric Co Ltd | 6,477 | |
| 8 | Contemporary Amperex Technology Co Ltd (CATL) | 6,208 | |
| 9 | SK On Co Ltd | 5,870 | |
| 10 | Contemporary Amperex Technology (Hong Kong) Limited | 5,829 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Murata Manufacturing Co Ltd | 5,296 | |
| 12 | Toshiba Corporation | 5,035 | |
| 13 | Sony Group Corporation | 3,837 | |
| 14 | Nissan Motor Co Ltd | 3,674 | |
| 15 | Mitsubishi Chemical Corporation | 3,648 | |
| 16 | Zeon Corporation | 3,455 | |
| 17 | Sumitomo Metal Mining Co Ltd | 3,420 | |
| 18 | Semicon Energy Lab Co Ltd | 3,202 | |
| 19 | Ningde Amperex Technology Ltd | 3,147 | |
| 20 | Samsung Electronics Co Ltd | 2,534 |
Incumbents’ deep H01M portfolios — covering cell chemistry, electrode materials, and structural components — create broad defensive positions that raise the cost of entry for challengers pursuing incremental improvements along established lithium-ion pathways.
Filing counts for 2024 and 2025 are materially undercounted due to typical patent publication lag of 12–18 months; apparent declines in those years should not be interpreted as real-world reductions in inventive activity.
Filing volume peaked in 2022; cell-chemistry IP dominates the technology mix
Two charts together reveal how activity has evolved over time and where technical attention is concentrated: the annual filing trend shows a field that built steadily from 2017 through a 2022 peak, while the technology composition chart shows overwhelming focus on the core H01M battery class.
Annual filing trend
Filings grew from 1,053 in 2017 to a peak of 1,700 in 2022, then eased to 1,406 in 2023. The 2024 figure of 911 and the 2025 figure of 759 are materially undercounted due to publication lag and do not represent real declines; the 2026 figure of 21 is a near-real-time artifact only.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (Batteries, cells and fuel cells) dominates with 19,997 patent records — far exceeding every other class. Adjacent classes including C01G (compounds of other metals), C01B (non-metallic elements and inorganic compounds), H02J (power supply and grid systems), and G01R (electric and magnetic measurement) each account for only a low single-digit share, signaling that innovation outside the core cell-chemistry domain remains relatively sparse.
↗ 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.
Solid electrolyte film for all-solid state seconda…
Provided are an inorganic solid electrolyte material including a sulfide-based inorganic solid electrolyte and an electron-insulating inorganic material that coats a surface of the sulfide-based inorganic solid electrolyte, is solid at 100° C., and fuses at a specific temperature, a slurry using the same, a solid electrolyte film for an all-solid state… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Lithium-Ion Secondary Battery | 1,027 |
| 2 | Nonaqueous secondary battery containing silicic ma… | 462 |
| 3 | Secondary battery | 418 |
| 4 | Secondary battery | 375 |
| 5 | Electrode material for lithium secondary battery a… | 304 |
| 6 | Non-aqueous electrolyte secondary battery | 275 |
| 7 | Non-aqueous secondary battery | 269 |
| 8 | Sulfide-series electrode material and secondary ba… | 246 |
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 patent structure means for R&D investment decisions
Four structural signals — maturity stage, concentration, collaboration networks, and geographic coverage — each carry distinct implications for where new investment is most or least likely to yield differentiated IP.
A mature field with annual volume easing from its 2022 peak
The lifecycle assessment places rechargeable battery technology in the Maturity stage: annual filings plateaued near their peak and have eased since 2022. On a multi-year basis the corpus remains large and active, but the rate of net new family creation has slowed. For R&D teams, this signals that broad, undifferentiated filings in core lithium-ion chemistry face a crowded prior-art landscape; value creation increasingly requires targeted claims in adjacent or next-generation domains.
Lifecycle: MaturityTop five filers hold 42% of the leading hundred filers’ combined records
The top five applicants — LG Energy Solution, Samsung SDI, Toyota Motor Corporation, LG Chem, and Panasonic Holdings — collectively hold 42% of the combined patent records of the hundred largest filers, indicating high concentration. The tier gap between first-place LG Energy Solution and second-place Samsung SDI is large, and all five leaders are Korean or Japanese incumbents. New entrants face substantial freedom-to-operate challenges in mainstream cell architectures and must either design around existing IP or pursue white-space branches.
Concentration: HighIntra-group and strategic industrial partnerships dominate co-filing activity
The most active co-filing pair is SK On and SK Innovation, with 204 jointly filed records, reflecting intra-group IP coordination within the SK ecosystem. Samsung SDI and Samsung Electronics co-filed 74 records, again an intra-conglomerate pairing. Cross-company strategic links include Toyota Motor Corporation with Sumitomo Metal Mining (29 records) and with Panasonic (28 records), and the SK Innovation–SK Advanced (19 records) pairing. Academic linkages are also present: Samsung SDI with UNIST (15 records), LG Chem with UNIST (13 records), and LG Energy Solution with KAIST (12 records), suggesting that university partnerships are a secondary but active channel for frontier research.
Collaboration: Industrial + AcademicU.S. and EPO are the primary enforcement jurisdictions
The United States leads all jurisdictions with 14,792 patent records, followed by Europe (EPO) with 4,965 records — together representing the two markets where the largest commercial and litigation stakes lie. Canada (140 records) and WIPO PCT (75 records) are smaller but indicate selective international prosecution strategies. Australia, the United Kingdom, and Singapore each have fewer than 20 records, suggesting limited direct filing outside the major markets. R&D teams should prioritize freedom-to-operate analysis in the U.S. and Europe first.
Lead office: United StatesGo 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 |
|---|---|---|
| SK On Co Ltd | SK Innovation Co Ltd | 204 |
| Samsung SDI Co Ltd | Samsung Electronics Co Ltd | 74 |
| Toyota Motor Corporation | Sumitomo Metal Mining Co Ltd | 29 |
| Toyota Motor Corporation | Panasonic Holdings Corporation | 28 |
| SK Innovation Co Ltd | SK Advanced Inc | 19 |
| Samsung SDI Co Ltd | UNIST (Ulsan National Institute of Science and Technology) | 15 |
| Sanyo Electric Co Ltd | Panasonic Holdings Corporation | 14 |
| Sanyo Electric Co Ltd | Mitsubishi Chemical Corporation | 14 |
| LG Chem Ltd | UNIST (Ulsan National Institute of Science and Technology) | 13 |
| LG Energy Solution Ltd | Korea Advanced Institute of Science and Technology (KAIST) | 12 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
LG Energy Solution leads; SK On is a fast-rising challenger
The leading players all concentrate their portfolios within the core H01M battery and electrode class, but differ materially in filing trajectory — LG Energy Solution is accelerating while several established names are contracting.
LG Energy Solution
LG Energy Solution holds the top-ranked position with 50,052 patent records and is filing at an accelerating pace (+36% recent trend), making it both the largest and among the fastest-growing major incumbents. Its portfolio is concentrated in H01M 10 (secondary cell systems), H01M 4 (electrode materials), and H01M 50 (structural components), covering the full cell architecture from chemistry through mechanical design. This breadth makes it the reference portfolio against which any new entrant must assess freedom-to-operate.
patent records: 50,052SK On
SK On, a recent corporate spin-off from SK Innovation, is recorded as a new entrant in the momentum data and has already accumulated 5,870 patent records — placing it ninth in the overall ranking — with 566 patent records in the recent window. Its technology focus mirrors the leaders (H01M 10, H01M 4, H01M 50), but its rapid ramp from a standing start signals aggressive portfolio building, likely in support of its large-format EV battery supply agreements. SK On and SK Innovation together account for the most active co-filing pair in the dataset.
patent records: 5,870| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| LG Chem Ltd | 71 | ▼ -89% |
| LG Energy Solution Ltd | 1,046 | ▲ +36% |
| Samsung SDI Co Ltd | 221 | ▼ -12% |
| SK On Co Ltd | 566 | ▲ new entrant |
| Zeon Corporation | 94 | ▼ -63% |
| SK Innovation Co Ltd | 225 | ▼ -7% |
| Toyota Motor Corporation | 65 | ▼ -59% |
| Contemporary Amperex Technology Co Ltd (CATL) | 278 | ▬ -3% |
Under-served branches adjacent to the dominant H01M core
Several IPC classes appear at the periphery of the rechargeable battery corpus with low relative filing share; where they also carry plausible technical value and a realistic entry path, they represent areas worth monitoring for differentiated IP strategy.
H02J · Power supply and grid systems
H02J accounts for 692 patent records — roughly 3% of the dominant H01M class — despite being the natural integration layer between rechargeable battery packs and the broader electrical grid, EV charging infrastructure, and stationary storage systems. As battery hardware matures, competitive differentiation is increasingly shifting to power management, bidirectional charging, and grid-balancing firmware. Entrants with strong power-electronics or grid-integration expertise may find room to build differentiated positions here with less exposure to the crowded cell-chemistry prior art.
Search this in Eureka →G01R · Electric and magnetic measurement
G01R holds 604 patent records — approximately 2% of H01M — covering sensing, measurement, and diagnostic instrumentation applied to battery systems. State-of-health estimation, in-situ electrochemical sensing, and non-destructive fault detection are active research areas directly relevant to battery management systems and second-life applications. This branch is adjacent to the dominant chemistry-focused core but draws on different technical disciplines (instrumentation, signal processing, machine learning), lowering overlap with incumbent portfolios and offering a plausible entry path for instrumentation or semiconductor-sensor players.
Search this in Eureka →How leading filers differ across technology sub-routes
Strength of each leader across the main technology routes.
| Player | H01M 10 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | H01M 50 · Batteries, cells & fuel cells | H01M 2 · Batteries, cells & fuel cells | C01G 53 · Compounds of other metals |
|---|---|---|---|---|---|
| LG Chem Ltd | Strong · 2,541 | Strong · 1,884 | Moderate · 702 | Moderate · 564 | Emerging · 154 |
| LG Energy Solution Ltd | Strong · 1,807 | Strong · 1,348 | Moderate · 394 | Absent | Emerging · 68 |
| Samsung SDI Co Ltd | Strong · 1,210 | Strong · 768 | Moderate · 538 | Moderate · 296 | Emerging · 79 |
| Zeon Corporation | Strong · 550 | Strong · 685 | Moderate · 279 | Moderate · 167 | Absent |
| SK On Co Ltd | Strong · 677 | Strong · 620 | Absent | Absent | Emerging · 71 |
| SK Innovation Co Ltd | Strong · 616 | Strong · 464 | Moderate · 151 | Emerging · 84 | Emerging · 39 |
| Sanyo Electric Co Ltd | Strong · 520 | Strong · 472 | Moderate · 127 | Emerging · 98 | Absent |
Frequently asked questions
The corpus covers 11,793 patent families in rechargeable battery technology. Separately, patent records (which count each national filing individually) are used for applicant rankings and jurisdiction breakdowns, so those figures can exceed the family total — a single family can have filings in multiple countries.
LG Energy Solution holds the top-ranked position with 50,052 patent records, well ahead of the second-ranked Samsung SDI at 20,247 patent records. LG Energy Solution’s recent filing trend is also accelerating at +36%, reinforcing its leading position.
The field is assessed as mature: annual filings peaked at 1,700 in 2022 and eased to 1,406 in 2023. The 2024 and 2025 figures are materially undercounted due to patent publication lag and do not represent genuine declines. On a multi-year basis the field remains large and active, but the pace of new family creation has slowed from its peak.
The United States leads with 14,792 patent records, followed by Europe (EPO) with 4,965 records. Canada (140 records) and WIPO PCT (75 records) are significantly smaller. Australia, the United Kingdom, and Singapore each have fewer than 20 records, indicating that most filers concentrate enforcement coverage in the U.S. and Europe.
The most active co-filing relationship is between SK On and SK Innovation (204 jointly filed records), an intra-group pairing within the SK ecosystem. Other notable pairs include Samsung SDI with Samsung Electronics (74 records), Toyota Motor Corporation with Sumitomo Metal Mining (29 records), and Toyota Motor Corporation with Panasonic (28 records). Academic co-filing links Samsung SDI with UNIST (15 records) and LG Chem with UNIST (13 records).
Based on evidence of relative filing sparsity alongside plausible technical relevance, H02J (power supply and grid systems, 692 patent records) and G01R (electric and magnetic measurement, 604 patent records) are the most notable under-served adjacent branches. Both sit at natural integration points with the dominant cell-chemistry core but draw on different technical disciplines, potentially offering differentiated IP opportunities for entrants from power-electronics or instrumentation backgrounds.
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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.