Bipolar Battery Cell Design Patent Landscape 2026
Bipolar Battery Cell Design Patent Landscape in 2026
The bipolar battery cell design space is a mature, concentrated field dominated by a small cluster of specialized firms, with Electro Energy Inc holding a commanding lead. Activity peaked around 2017 and has since settled into irregular, lower-volume filing, with the United States remaining the primary jurisdiction by a wide margin.
Electro Energy Inc leads a tightly concentrated field
Electro Energy Inc sits at the top of the top five filers together account for 48% of the combined total across the hundred largest filers, confirming a strongly concentrated competitive structure.
A visible tier gap separates the top three incumbents from mid-tier players such as Advanced Battery Concepts LLC and Ionic Materials Inc, and from single-digit filers further down. This two-tier structure leaves limited open ground in the core H01M space for new entrants without a differentiated technical angle.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Electro Energy Inc | 36 | |
| 2 | EXXONMOBIL TECHNOLOGY & ENGINEERING CO | 23 | |
| 3 | E C R Electro Chem Res | 21 | |
| 4 | 24M Technologies Inc | 20 | |
| 5 | Advanced Battery Concepts LLC | 16 | |
| 6 | Ionic Materials Inc | 12 | |
| 7 | EOS Energy Technology Holdings LLC | 12 | |
| 8 | Space Systems Loral Inc | 10 | |
| 9 | Fleischer Niles A | 7 | |
| 10 | BIPOLAR TECH | 6 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | ADA Technologies Inc | 6 | |
| 12 | Honeycomb Battery Co | 5 | |
| 13 | The Regents of the University of Michigan | 5 | |
| 14 | Altus Corp | 4 | |
| 15 | The Dow Chemical Company | 4 | |
| 16 | PolyPlus Battery Co Inc | 3 | |
| 17 | Catanzarite Vincent Owen | 3 | |
| 18 | The Board of Trustees of the Leland Stanford Junior University | 3 | |
| 19 | Klein Martin G | 3 | |
| 20 | Energy Development Associates Inc | 2 |
The leaders’ positions reflect deep, long-standing investment in stacked-wafer and solid-electrolyte bipolar cell architectures. Their accumulated citation mass — the most-cited work draws 206 forward citations — reinforces their role as the foundational reference points for this design space.
The most recent 18–24 months of filing data are subject to publication lag and likely under-represent current activity; interpret recent low counts accordingly. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Irregular filing cadence and an H01M-dominant technology mix
Two charts together capture where the field stands: the annual filing trend reveals a field that peaked around 2017 and has since filed at irregular, lower volumes, while the IPC composition shows that H01M remains overwhelmingly dominant with pockets of adjacent activity in coatings and capacitor-related classes.
Annual filing trend
Filings reached their clearest peak in 2017 at 15 records before falling sharply and becoming sporadic. The uptick visible in 2023 should be read with caution as a potential cluster of activity rather than a new trend; data for 2024–2026 are subject to publication lag and will likely revise upward.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) accounts for the large majority of IPC references at 224 records, confirming the field is tightly focused on core electrochemical cell engineering. H01G (capacitors, 31 records) and C23C (coating and surface deposition, 17 records) are the most substantial adjacent branches, pointing to hybrid-capacitor and surface-engineering sub-themes.
↗ 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.
Bipolar battery assembly
A bipolar battery having: a) two or more stacks of battery plates; b) a liquid electrolyte disposed in between the battery plates to form electrochemical cells; c) a plurality of separators, wherein each individual separator is located in each electrochemical cell; d) one or more dual polar battery plates disposed between two or more stacks of battery… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Bipolar electrochmeical battery of stacked wafer c… | 206 |
| 2 | Electrochemical cells and methods of manufacturing… | 181 |
| 3 | Cell structure for electrochemical devices and met… | 126 |
| 4 | Electrochemical cells and methods of manufacturing… | 124 |
| 5 | Electrochemical cell with a non-liquid electrolyte | 117 |
| 6 | Electrochemical cells and methods of manufacturing… | 111 |
| 7 | Electrochemical cells and methods of manufacturing… | 105 |
| 8 | Electrochemical cells and methods of manufacturing… | 95 |
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 allocation
Four structural reads — maturity, concentration, collaboration, and geography — shape the risk and opportunity calculus for any team considering entry or expansion in bipolar cell design.
Field is at maturity with eased annual volume since 2017 peak
The lifecycle stage is Maturity: annual filings plateaued near their peak and have eased since 2017, though the multi-year window still shows a 15% recent growth signal. For R&D teams, this means foundational cell architectures are well-covered, and differentiation must come through adjacent angles such as materials or manufacturing process rather than core cell topology.
Lifecycle: MatureTop five filers hold nearly half of the leading-100 filer share
The top five filers — Electro Energy Inc, ExxonMobil Technology & Engineering Co, E C R Electro Chem Res, 24M Technologies Inc, and Advanced Battery Concepts LLC — account for 48% of the combined total among the hundred largest filers. This level of concentration means that securing freedom-to-operate in core bipolar cell claims requires careful landscape clearance, and any new portfolio strategy should map against these incumbents’ claim perimeters.
High concentrationLimited co-filing activity; one notable inventor-firm pair
The evidence shows a single identified co-filing relationship: Niles A. Fleischer and E C R Electro Chem Res, with six joint records. This suggests that bipolar cell IP has largely been developed within individual organizations rather than through multi-party consortia, which may reflect the proprietary nature of the technology and the dominance of specialized small firms over large open-innovation networks.
Low collaboration densityUnited States dominates; secondary filing into EPO and PCT
The United States leads with 93 patent records, followed by Europe via EPO at 48 and WIPO PCT at 17. Secondary markets include Australia and Canada at 13 each, and Japan at 9. The limited presence in Asian manufacturing jurisdictions outside Japan points to a potential gap in protection strategy for teams targeting high-volume battery production markets.
US-centric, EPO secondaryGo 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 |
|---|---|---|
| Fleischer Niles A | E C R Electro Chem Res | 6 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Electro Energy Inc leads; ExxonMobil and 24M show contrasting trajectories
The top of the ranking is held by long-established specialists, while newer entrants such as 24M Technologies and EOS Energy Technology Holdings are building positions from a small base. The applicant momentum and technology-focus data together reveal meaningful strategic differences.
Electro Energy Inc
With 36 patent records, Electro Energy Inc is the clear volume leader. Their technology focus is tightly concentrated across H01M 10, H01M 4, and H01M 2 — the core battery cell, electrode, and cell-components sub-classes — indicating deep coverage of the fundamental bipolar stacked-cell architecture. No recent-period momentum data is flagged, consistent with a mature incumbent holding an established portfolio.
patent records: 3624M Technologies Inc
24M Technologies Inc holds 20 patent records and is flagged as a new entrant in recent-period momentum, with 3 recent records representing an emerging position rather than a long-standing one. Their focus spans H01M 50, H01M 10, and H01M 2, with particular weight on H01M 50 (cell housings and ancillary components), suggesting a manufacturing-process and cell-integration angle that complements rather than directly overlaps the core architecture claims of the top incumbent.
patent records: 20| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| 24M Technologies Inc | 3 | ▲ new entrant |
| Ionic Materials Inc | 2 | ▲ new entrant |
| EOS Energy Technology Holdings LLC | 8 | ▲ new entrant |
Under-served IPC branches adjacent to the core cell design space
Several IPC branches appear at low share relative to the dominant H01M cluster, indicating areas where patent density is thin. These are observations of relative sparsity; whether each represents a viable entry point depends on technical fit and commercial context.
C23C · Coating & surface deposition
With 17 patent records and a 6% share of IPC references, coating and surface deposition is the most substantial adjacent branch. In bipolar cell design, current-collector and electrode surface treatments are critical to cycle life and contact resistance — yet the coverage here is sparse relative to the core H01M claims. Teams with expertise in thin-film or electrochemical deposition processes could find less-crowded claim space by linking surface engineering innovations explicitly to bipolar cell performance metrics.
Search this in Eureka →H02J · Power supply and grid systems
H02J appears in only 6 patent records at a 2% share, suggesting that system-level integration of bipolar cells into power supply and grid management architectures is largely unclaimed territory within this corpus. Given growing interest in grid-scale storage, a filing strategy that bridges bipolar cell pack design with power electronics control and battery management systems could occupy ground that incumbent cell designers have not yet claimed.
Search this in Eureka →How leading filers differ by IPC technology route
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 | H01M 6 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Electro Energy Inc | Strong · 36 | Strong · 30 | Moderate · 16 | Strong · 24 | Moderate · 10 |
| ExxonMobil Technology & Engineering Co | Strong · 18 | Strong · 18 | Strong · 15 | Strong · 13 | Absent |
| E C R Electro Chem Res | Strong · 18 | Strong · 20 | Absent | Absent | Strong · 18 |
| 24M Technologies Inc | Strong · 18 | Absent | Strong · 20 | Strong · 14 | Absent |
| Advanced Battery Concepts LLC | Strong · 16 | Moderate · 6 | Strong · 13 | Strong · 12 | Absent |
| BIPOLAR TECH | Strong · 6 | Strong · 6 | Strong · 6 | Strong · 6 | Strong · 6 |
| Ionic Materials Inc | Strong · 12 | Strong · 12 | Absent | Absent | Absent |
Frequently asked questions
The corpus contains 53 patent families in scope. Activity peaked around 2017 and has been irregular since, though publication lag means the most recent 18–24 months are likely under-counted.
Electro Energy Inc leads with 36 patent records, concentrated across the core H01M battery cell, electrode, and cell-component sub-classes. The next-ranked filers are ExxonMobil Technology & Engineering Co at 23 and E C R Electro Chem Res at 21.
It is highly concentrated: the top five filers — Electro Energy Inc, ExxonMobil Technology & Engineering Co, E C R Electro Chem Res, 24M Technologies Inc, and Advanced Battery Concepts LLC — account for 48% of the combined total among the hundred largest filers.
The United States is by far the primary jurisdiction with 93 patent records. Europe via EPO follows at 48, WIPO PCT at 17, and Australia and Canada at 13 each. Asian coverage outside of Japan (9 records) is limited.
The field is assessed as Mature: annual filings plateaued near their 2017 peak and have eased since. The multi-year window still reflects a 15% recent growth signal, but annual volume is no longer at its peak level.
C23C (coating and surface deposition, 17 records, 6% share) and H02J (power supply and grid systems, 6 records, 2% share) show the most relative sparsity among adjacent IPC branches. B29C (shaping of plastics) and B32B (layered products and laminates) each carry only 3 records.
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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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