Bipolar Battery Manufacturing Process Patent Landscape
Bipolar Battery Manufacturing Process Patent Landscape in 2026
The bipolar battery manufacturing process field is still expanding on a multi-year basis, with recent three-year filings roughly double the prior three-year window, though annual volume has eased from its 2018 peak. The field is heavily concentrated: Nissan Motor leads by a wide margin, and the top five filers account for 59% of activity among the hundred largest filers.
Nissan dominates a tightly held field with two Toyota affiliates closing in
Nissan Motor Co. holds the top position by a substantial margin, followed by Nilar International, Advanced Battery Concepts, and two Toyota entities — Toyota Motor Corporation and Toyota Industries Corporation — rounding out the top five.
The top five filers account for 59% of activity among the hundred largest filers, indicating a highly concentrated competitive structure with a pronounced tier gap between the lead group and the mid-tier challengers starting at rank six.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nissan Motor Co., Ltd. | 255 | |
| 2 | Nilar International AB | 117 | |
| 3 | Advanced Battery Concepts LLC | 113 | |
| 4 | Toyota Motor Corporation | 77 | |
| 5 | Toyota Industries Corporation | 58 | |
| 6 | French Alternative Energies and Atomic Energy Commission (CEA) | 46 | |
| 7 | Gridtential Energy Inc. | 34 | |
| 8 | LG Energy Solution Ltd. | 27 | |
| 9 | The Ultimate Battery Co., Ltd. | 19 | |
| 10 | Atraverda Ltd. | 16 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | East Penn Manufacturing Co., Inc. | 16 | |
| 12 | Eos Energy Technology Holdings LLC | 12 | |
| 13 | Energy Development Associates Inc. | 11 | |
| 14 | Lasagna One Inc. | 11 | |
| 15 | General Motors LLC | 11 | |
| 16 | Exergy Power Systems | 9 | |
| 17 | Hughes Aircraft Co. | 9 | |
| 18 | Eltech Systems | 8 | |
| 19 | Netherlands Organisation for Applied Scientific Research (TNO) | 8 | |
| 20 | Furukawa Electric Co., Ltd. | 8 |
Nissan’s commanding position, combined with Toyota Motor’s sharply rising momentum, suggests that the two largest Japanese automakers are treating bipolar battery manufacturing as a strategic capability rather than a peripheral research area, which raises barriers for newcomers without equivalent manufacturing scale.
The most recent 18–24 months are subject to publication lag and will be under-counted in any snapshot; apparent softness in 2024–2026 filings should not be read as a reversal of the multi-year growth trend. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth is real, but core chemistry dominates the technology mix
The annual filing trend and the IPC branch breakdown together reveal a field with genuine growth momentum that remains almost entirely anchored in electrochemical cell engineering, leaving several adjacent technical areas relatively sparse.
Annual filing trend
Filing activity surged in 2018 then eased before recovering in 2022–2023; the recent three-year window is approximately double the prior three-year window on a gross basis. The 2024–2026 bars are under-counted due to publication lag and should not be treated as indicative of a new decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) is overwhelmingly dominant, reflecting the core electrochemical focus of the field. Adjacent branches — including B60L (electric vehicle propulsion), H02J (power supply and grid systems), and H01G (capacitors) — each account for a small share, pointing to limited cross-disciplinary integration to date.
↗ 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 and assembly method
BIPOLAR BATTERY AND ASSEMBLY METHOD Abstract of the Disclosure Bipolar battery and method of making intercell connections between adjacent cells thereof including a container having an intercell partition a section of which is thicker than the remainder of the partition. The thickened section has an opening therethrough receiving the intercell connectors… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Sealing structure of bipolar type battery | 247 |
| 2 | Biploar battery and its manufacturing method | 236 |
| 3 | Bipolar battery and related method | 227 |
| 4 | Bipolar battery | 207 |
| 5 | Bipolar metal/air battery | 152 |
| 6 | Bipolar battery construction | 134 |
| 7 | Bipolar battery | 125 |
| 8 | Bipolar battery and related method | 115 |
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
Four structural features — lifecycle stage, ownership concentration, collaboration patterns, and geographic spread — each carry distinct implications for where a new entrant or incumbent should focus resources.
Growth stage with eased annual pace
The field is classified as Growth: the recent three-year filing window is 103% above the prior three-year window, confirming genuine expansion on a multi-year basis. However, annual volume has eased from its 2018 peak, so the field is not in a steep early-stage ramp. Entrants can still establish positions, but the window of low-competition entry is narrowing.
Lifecycle: GrowthTop five hold 59% of ranked activity
With the top five filers accounting for 59% of activity among the hundred largest filers, this is a high-concentration field. Nissan’s lead is particularly pronounced. Mid-tier players such as the French Alternative Energies and Atomic Energy Commission (CEA) and Gridtential Energy hold meaningful but substantially smaller positions, and rank-six-and-below applicants show no signs of closing the tier gap rapidly.
High concentrationToyota ecosystem is the only active co-filing pair
The most active co-filing relationship on record is Toyota Motor Corporation and Toyota Industries Corporation, which have jointly filed 17 times, signaling coordinated development of cell architecture and manufacturing tooling within the Toyota group. Nissan Motor and Sanyo Chemical Industries have one recorded co-filing. No cross-company or industry–academic partnerships of scale are evident in the data beyond these two pairs.
Intra-group collaborationJapan leads, but Europe and the US are near-equivalent second tiers
Japan is the leading filing jurisdiction, followed closely by the EPO (Europe), the United States, and China. South Korea and WIPO (PCT) filings also represent meaningful coverage. Sweden’s presence reflects Nilar International’s home market. The breadth of jurisdictions — spanning India, Germany, Canada, and Australia among others — indicates that the leading filers are pursuing multi-regional protection rather than concentrating on a single market.
Multi-regionalGo 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 |
|---|---|---|
| Toyota Motor Corporation | Toyota Industries Corporation | 17 |
| Nissan Motor Co., Ltd. | Sanyo Chemical Industries, Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Nissan holds the commanding position; Toyota Motor is the fastest-rising challenger
The top two players differ sharply in trajectory: Nissan’s portfolio is large and established, while Toyota Motor has more than doubled its recent filing rate, suggesting an accelerating strategic commitment to bipolar cell manufacturing.
Nissan Motor Co., Ltd.
Nissan leads the field with 255 patent records, all concentrated in core H01M electrochemical cell classes (H01M 10, H01M 2, and H01M 50). The portfolio spans cell architecture, sealing structures, and manufacturing methods. No momentum figure for Nissan is available in the current evidence set, but the scale of the existing portfolio represents a substantial prior-art and freedom-to-operate barrier for challengers.
patent records: 255Toyota Motor Corporation
Toyota Motor holds 77 patent records with a recent-period trend of +162% versus the prior three-year window, the strongest momentum among established players. Its technology focus mirrors Nissan’s — H01M 10, H01M 50, and H01M 4 — but the sharp uptick in recent filings, combined with 17 co-filings with Toyota Industries Corporation, points to a coordinated group-level push into bipolar manufacturing. The large percentage jump should be read in context of a smaller prior base relative to Nissan.
patent records: 77| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Advanced Battery Concepts LLC | 15 | ▼ -12% |
| Toyota Motor Corporation | 34 | ▲ +162% |
| Toyota Industries Corporation | 6 | ▲ new entrant |
| Gridtential Energy Inc. | 7 | ▲ new entrant |
| LG Energy Solution Ltd. | 3 | ▲ new entrant |
Five under-served technical branches adjacent to the dominant H01M core
Beyond the dominant H01M core, several IPC branches appear with low patent-record counts, indicating that the technical interfaces between bipolar battery manufacturing and these adjacent domains have received limited systematic attention. These are observations of relative sparsity; they warrant further technical due-diligence before being treated as investment opportunities.
B60L · Electric vehicle propulsion integration
With only 30 patent records in the B60L branch, the interface between bipolar cell manufacturing and EV powertrain integration — covering aspects such as high-voltage stack assembly, thermal management within the drive system, and module-to-vehicle electrical architecture — is relatively underdeveloped given the clear automotive application of most leading filers. Entrants with combined expertise in cell manufacturing and EV systems engineering could address assembly and packaging specifics that pure cell developers have not yet covered.
Search this in Eureka →F28F · Heat-exchanger details for bipolar stacks
Only 9 patent records appear in F28F (heat-exchanger component details), suggesting that the thermal management hardware specific to bipolar battery stacks — where bipolar plates must simultaneously serve electrochemical and thermal functions — has not been systematically claimed as a manufacturing process. This gap is technically plausible given that bipolar plate geometry directly governs cooling channel design, and process-level IP on heat-exchanger-integrated bipolar plates could complement the dominant cell-chemistry portfolios held by Nissan and Toyota.
Search this in Eureka →How leading applicants 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 |
|---|---|---|---|---|---|
| Nissan Motor Co., Ltd. | Strong · 251 | Moderate · 118 | Moderate · 120 | Strong · 154 | Emerging · 44 |
| Advanced Battery Concepts LLC | Strong · 112 | Strong · 63 | Strong · 75 | Strong · 58 | Moderate · 44 |
| Nilar International AB | Strong · 83 | Moderate · 35 | Strong · 51 | Strong · 63 | Moderate · 19 |
| Toyota Motor Corporation | Strong · 71 | Moderate · 35 | Strong · 49 | Moderate · 21 | Emerging · 5 |
| French Alternative Energies and Atomic Energy Commission (CEA) | Strong · 44 | Strong · 42 | Strong · 31 | Strong · 29 | Absent |
| Toyota Industries Corporation | Strong · 53 | Absent | Moderate · 22 | Strong · 30 | Absent |
| Gridtential Energy Inc. | Strong · 31 | Strong · 25 | Strong · 29 | Moderate · 15 | Absent |
Frequently asked questions
The corpus covers 363 patent families in scope. The applicant ranking and branch counts are measured at the patent-record level, so those figures can exceed the family total because a single family may generate records in multiple jurisdictions or IPC classes.
Nissan Motor Co., Ltd. leads with 255 patent records, more than double the next-ranked applicant, Nilar International AB, which holds 117 patent records.
Yes, on a multi-year basis: recent three-year filings are approximately 103% above the prior three-year window. Annual volume has eased from its 2018 peak, so growth is better described as sustained expansion with moderated annual pace rather than a steep ramp. The most recent 18–24 months are under-counted due to publication lag.
Japan is the leading jurisdiction, followed closely by Europe (EPO), the United States, and China. South Korea and WIPO (PCT) filings also represent meaningful coverage, and several other markets — including Germany, India, Sweden, and Canada — have notable presence.
The most active co-filing pair is Toyota Motor Corporation and Toyota Industries Corporation, with 17 joint filings, reflecting coordinated group-level R&D. Nissan Motor and Sanyo Chemical Industries have one recorded co-filing. No large-scale cross-company or industry–academic partnerships are evident in the evidence beyond these two pairs.
The most notable under-served adjacent branches, based on low patent-record counts relative to the dominant H01M core, are B60L (electric vehicle propulsion integration, 30 records), H02J (power supply and grid systems, 16 records), H01G (capacitors, 15 records), C09J (adhesives, 9 records), and F28F (heat-exchanger details, 9 records). These observations warrant technical due-diligence before being treated as confirmed investment opportunities.
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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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