Li-Ion Energy Density & Fast Charging Patent Landscape
The Li-ion energy density and fast charging patent space is dominated by a tight cluster of Chinese battery makers, with Contemporary Amperex Technology (Hong Kong) Limited holding the top position among 3,002 patent families in scope. Annual volume peaked in 2023 and has since eased, placing the field at a mature stage where differentiation increasingly turns on adjacent material science and charging-system routes.
CATL entities dominate a moderately concentrated field
Contemporary Amperex Technology (Hong Kong) Limited sits at the top of the applicant ranking, followed closely by its affiliate Contemporary Amperex Technology Co Ltd and Zhuhai CosMX Battery Co Ltd—three filers whose combined output reflects the scale advantage of. China’s largest battery manufacturers.
The top five filers account for 25% of the combined output of the hundred largest filers, signaling moderate-to-high concentration at the summit but meaningful activity across a broad mid-tier. A second tier anchored by Robert Bosch GmbH and Medtronic Inc shows that automotive Tier-1 and medical-device interests maintain substantial positions alongside pure-play cell makers.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Contemporary Amperex Technology (Hong Kong) Limited | 255 | |
| 2 | Contemporary Amperex Technology Co., Ltd. | 115 | |
| 3 | Zhuhai CosMX Battery Co., Ltd. | 110 | |
| 4 | Ningde Amperex Technology Ltd. | 102 | |
| 5 | Robert Bosch GmbH | 81 | |
| 6 | Medtronic Inc. | 72 | |
| 7 | Sila Nanotechnologies Inc. | 66 | |
| 8 | BYD Co., Ltd. | 61 | |
| 9 | A123 Systems LLC | 61 | |
| 10 | Hydro-Québec | 61 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Toyota Motor Corporation | 60 | |
| 12 | GRST International Ltd. | 57 | |
| 13 | Regents of the University of California | 57 | |
| 14 | SVOLT Energy Technology Co., Ltd. | 54 | |
| 15 | Beijing Easpring Material Technology Co., Ltd. | 51 | |
| 16 | BTR New Material Group Co., Ltd. | 46 | |
| 17 | Shenzhen Capchem Technology Co., Ltd. | 45 | |
| 18 | AESC Japan Ltd. | 38 | |
| 19 | GM Global Technology Operations LLC | 36 | |
| 20 | Graphenix Development Inc. | 34 |
CATL’s multi-entity strategy—spanning its Hong Kong holding vehicle, the mainland operating entity, and the Ningde Amperex subsidiary—suggests that freedom-to-operate analyses must treat affiliated filings as a coordinated portfolio rather than independent applicants. Challengers seeking space should map claims at the sub-group level to identify gaps within this consolidated block.
Filings from 2024 onward are subject to standard patent-publication lag and will appear under-counted until processing is complete; the apparent step-down in those years does not reflect real activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Volume plateaued near a 2023 peak; H01M overwhelmingly dominant
Two complementary views—annual filing volume and IPC class composition—reveal a maturing field whose core electrochemical classes are well-occupied while adjacent material and system classes remain comparatively sparse.
Annual filing trend
Filings grew from 234 in 2017 to a high of 429 in 2023, then receded to 331 in 2024 and 231 in 2025—consistent with publication lag rather than a real drop. The 9% recent-window growth figure confirms the multi-year trajectory remains positive even as the annual pace has eased from its 2023 peak. The 2026 figure of 23 reflects only the earliest published applications and should not be read as a trend.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (Batteries, cells & fuel cells) accounts for the vast majority of IPC records, establishing it as the unambiguous core class. The next-largest classes—C01B (Non-metallic elements & inorganic compounds), C01G (Compounds of other metals), and H02J (Power supply & grid systems)—are each far smaller, pointing to areas where applied material chemistry and charging-system integration remain less densely patented relative to core cell engineering.
↗ 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.
Method for configuring and prelithiating a fast ch…
Prelithiation methods and fast charging lithium ion cell are provided, which combine high energy density and high power density. Several structural and chemical modifications are disclosed to enable combination of features that achieve both goals simultaneously in fast charging cells having long cycling lifetime. The cells have anodes with high content of… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Cathode materials for secondary (rechargeable) lit… | 1,119 |
| 2 | Cathode materials for secondary (rechargeable) lit… | 516 |
| 3 | Medical device having lithium-ion battery | 468 |
| 4 | Materials for solid state electrolytes and protect… | 399 |
| 5 | Flotation method for recovering lithium-ion batter… | 256 |
| 6 | Data-driven Model for Lithium-ion Battery Capacity… | 199 |
| 7 | Cathode materials for secondary (rechargeable) lit… | 185 |
| 8 | Dual battery charging device for charging nickel m… | 177 |
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
Taken together, the lifecycle stage, concentration profile, collaboration network, and jurisdiction footprint shape where incremental R&D spend is likely to find freedom to operate and where it faces the densest prior-art.
Field is at maturity with annual volume easing from a 2023 peak
The lifecycle stage is classified as Maturity because annual filings have plateaued near their 2023 peak of 429 patent families. On a multi-year basis the 9% recent-window growth still marks net expansion, but the pace of new entrants and core-cell claims is slowing. R&D teams entering now face a denser prior-art landscape and should prioritize claim mapping before committing to core H01M territory.
Lifecycle: MaturityTop five filers hold 25% of the leading hundred’s output
The field is moderately concentrated: CATL-affiliated entities occupy three of the top four positions, and the top five collectively account for 25% of the hundred largest filers’ combined patent families. A broad mid-tier—including Sila Nanotechnologies, BYD, A123 Systems, and Hydro-Québec—indicates that well-resourced challengers can still build meaningful portfolios. The tier gap between rank 1 (255 patent families) and rank 5 (81 patent families) is significant but not prohibitive for focused new entrants.
Concentration: Moderate-HighBosch is the most active co-filer; academia-industry links visible
Robert Bosch GmbH is the most networked co-applicant, filing jointly with GS Yuasa International, Lithium Energy and Power GmbH & Co. KG, Robert Bosch Battery Systems, and Samsung SDI. Sila Nanotechnologies co-files with Georgia Tech Research Corporation and Battelle Memorial Institute, illustrating an active startup-to-lab pipeline. Zhuhai CosMX Battery and its affiliate Zhuhai Guanqi New Materials show intra-group coordination. These clusters suggest that licensing or co-development approaches targeting Bosch’s or Sila’s ecosystems could accelerate entry.
Collaboration: Ecosystem clustersUS leads on filings; EPO and PCT are the key secondary routes
The United States is the primary prosecution jurisdiction. Europe (EPO) and WIPO (PCT) are the next most active routes, followed by China and India. The relatively high India count signals growing commercial interest in South Asian EV and consumer-electronics markets. Japan and South Korea—home to major cell manufacturers—show lower filing counts in this corpus, which may reflect domestic prosecution strategies that route through EPO or PCT rather than direct national filings.
Geography: US-led, global spreadGo 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 |
|---|---|---|
| Zhuhai CosMX Battery Co., Ltd. | Zhuhai Guanqi New Materials Co., Ltd. | 4 |
| Ningde Amperex Technology Ltd. (ATL) | Dongguan Amperex Technology Ltd. | 3 |
| Robert Bosch GmbH | GS Yuasa International Ltd. | 3 |
| Sila Nanotechnologies Inc. | Georgia Tech Research Corporation | 3 |
| Robert Bosch GmbH | Lithium Energy and Power GmbH & Co. KG | 2 |
| Robert Bosch GmbH | Robert Bosch Battery Systems GmbH | 1 |
| Robert Bosch GmbH | Samsung SDI Co., Ltd. | 1 |
| Medtronic Inc. | McGill University | 1 |
| Sila Nanotechnologies Inc. | Battelle Memorial Institute | 1 |
| BYD Co., Ltd. | Chuzhou FinDreams Battery Co., Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
CATL entities lead; Sila Nanotechnologies is the fastest-rising challenger
The leading positions are dominated by Chinese cell makers operating through multiple legal entities, while Western challengers differentiate on advanced materials and automotive integration. Momentum signals from recent-versus-prior filing periods highlight diverging trajectories within the top tier.
Contemporary Amperex Technology (Hong Kong) Limited
The top-ranked applicant holds 255 patent families, concentrated heavily in H01M 10 and H01M 4—core battery-cell and electrode classes. Its mainland affiliate Contemporary Amperex Technology Co Ltd (115 patent families) and Ningde Amperex Technology Ltd (102 patent families) extend this dominance across multiple legal entities. The group’s recent momentum shows a -52% trend for the mainland entity, consistent with a maturing portfolio strategy shifting from volume to quality and litigation positioning.
families: 255Sila Nanotechnologies Inc
Sila Nanotechnologies holds 66 patent families and is the most dynamic filer in the top tier, posting a +163% momentum trend in recent filings versus the prior period. Its focus sits within H01M 10 and H01M 4—silicon-anode and next-generation electrode materials—and it co-files with Georgia Tech Research Corporation and Battelle Memorial Institute, signaling a research-pipeline-to-commercial strategy. The large momentum jump warrants monitoring for freedom-to-operate risks in silicon-dominant anode designs.
families: 66| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | 88 | ▼ -52% |
| Zhuhai CosMX Battery Co., Ltd. | 57 | ▲ +68% |
| Ningde Amperex Technology Ltd. (ATL) | 34 | ▲ +55% |
| Medtronic Inc. | 3 | ▼ -75% |
| Sila Nanotechnologies Inc. | 42 | ▲ +163% |
| A123 Systems LLC | 15 | ▬ 0% |
| BYD Co., Ltd. | 24 | ▬ 0% |
| SVOLT Energy Technology Co., Ltd. | 31 | ▲ +72% |
Under-served branches adjacent to the core cell-engineering space
Relative to the dominant H01M core, several IPC branches show materially lower patent density. These observations of sparsity do not automatically constitute commercial opportunities, but two branches have plausible technical relevance and realistic entry paths for teams with the right competencies.
H02J · Power supply & grid systems
H02J carries 173 IPC records against the much larger H01M base, making it one of the sparser branches among those with direct relevance to fast-charging deployment. Charging-protocol optimization, bidirectional grid integration, and smart-charging algorithms sit here. Entry is realistic for power-electronics and software teams, and the branch avoids the densest cell-chemistry prior-art. Teams combining BMS firmware expertise with H02J claims could carve a defensible position as fast-charging infrastructure scales.
Search this in Eureka →B82Y · Nanotechnology applications
B82Y shows 82 IPC records—sparse relative to the core—covering nano-structured electrode materials, carbon nanotubes, and quantum-dot electrolyte additives that can lift energy density without redesigning cell geometry. The branch intersects with Sila Nanotechnologies’ silicon-anode work (H01M 4) but from a different angle, suggesting differentiation is still achievable. Academic co-development routes, as evidenced by the Sila–Georgia Tech collaboration, represent a realistic entry path for teams without large internal synthesis capabilities.
Search this in Eureka →How leading applicants differ by IPC technology route
Route coverage across the main technology branches in the current evidence set.
| 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 |
|---|---|---|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | Strong · 318 | Strong · 232 | Emerging · 27 | Absent | Emerging · 12 |
| Zhuhai CosMX Battery Co., Ltd. | Strong · 109 | Strong · 95 | Moderate · 27 | Absent | Absent |
| Ningde Amperex Technology Ltd. (ATL) | Strong · 95 | Strong · 65 | Moderate · 30 | Emerging · 11 | Absent |
| Medtronic Inc. | Strong · 72 | Strong · 64 | Moderate · 18 | Absent | Absent |
| A123 Systems LLC | Strong · 62 | Strong · 60 | Absent | Absent | Emerging · 5 |
| Robert Bosch GmbH | Strong · 77 | Absent | Moderate · 26 | Moderate · 21 | Absent |
| Sila Nanotechnologies Inc. | Strong · 66 | Strong · 52 | Absent | Absent | Absent |
Frequently asked questions
The corpus covers 3,002 patent families identified by PatSnap Eureka for this technology topic. The 2024 and 2025 figures are subject to publication lag and will increase as applications are published and indexed.
Contemporary Amperex Technology (Hong Kong) Limited leads with 255 patent families, more than twice the count of the fifth-ranked applicant, Robert Bosch GmbH, which holds 81 patent families. The gap between rank 1 and rank 2—its mainland affiliate at 115 patent families—illustrates how CATL uses a multi-entity structure to distribute its portfolio.
The field is classified as Maturity. Annual filings plateaued near their 2023 peak of 429 patent families and have since eased. The multi-year recent-window growth remains positive at 9%, meaning the field is still expanding on a cumulative basis, but the pace of annual new filings has moderated.
The United States is the primary prosecution jurisdiction, followed by Europe (EPO) and WIPO (PCT). China and India are the next most active jurisdictions. Japan and South Korea, while home to major cell manufacturers, show lower direct-filing counts in this corpus, likely reflecting routing through EPO or PCT applications.
Sila Nanotechnologies Inc shows the strongest recent momentum among the tracked applicants, with a +163% trend in recent filings versus the prior period. Zhuhai CosMX Battery Co Ltd (+68%) and Ningde Amperex Technology Ltd (+55%) also show strong upward momentum. Note that a very high percentage jump can reflect a relatively small prior-period base.
Relative to the dominant H01M core, H02J (Power supply & grid systems, 173 IPC records) and B82Y (Nanotechnology applications, 82 IPC records) are among the sparser branches with plausible technical relevance to energy density and fast charging. C01G (Compounds of other metals, 261 records) and C01B (Non-metallic elements & inorganic compounds, 298 records) are also less densely occupied than H01M and may offer differentiation space in precursor material chemistry.
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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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