Bipolar Battery Patent Landscape 2026
Bipolar Battery Patent Landscape in 2026
Nissan Motor dominates a highly concentrated bipolar battery patent field, holding a commanding lead over all other filers, with the United States as the primary filing jurisdiction. The field has reached a mature plateau on an annual basis, though a multi-year growth window of 18% signals sustained commercial interest from both incumbents and new entrants.
Nissan leads a sharply tiered, Japan-anchored competitive field
Nissan Motor Co Ltd stands as the clear leader in bipolar battery patenting, holding 957 patent records — more than double the combined total of the next two ranked applicants, Toyota Motor Corporation (403) and Toyota Industries Corporation (187). This degree of separation at the top is unusual and signals deliberate, sustained R&D commitment by Nissan over many years.
The top five filers account for 50% of the combined total of the hundred largest filers, confirming a highly concentrated competitive structure. A distinct tier gap separates Nissan from Toyota, and a second gap separates the Toyota group from the cluster of specialist firms — Nilar International (164), Advanced Battery Concepts LLC (163), and EOS Energy Technology Holdings LLC (126) — that follow.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nissan Motor Co Ltd | 957 | |
| 2 | Toyota Motor Corporation | 403 | |
| 3 | Toyota Industries Corporation | 187 | |
| 4 | Nilar International AB | 164 | |
| 5 | Advanced Battery Concepts LLC | 163 | |
| 6 | EOS Energy Technology Holdings LLC | 126 | |
| 7 | Toshiba Corporation | 102 | |
| 8 | Gridtential Energy Inc | 95 | |
| 9 | French Alternative Energies and Atomic Energy Commission (CEA) | 92 | |
| 10 | Atraverda Ltd | 70 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | East Penn Manufacturing Co Inc | 60 | |
| 12 | EOS Energy Storage LLC | 51 | |
| 13 | Envision AESC Japan Ltd | 49 | |
| 14 | LG Energy Solution Ltd | 48 | |
| 15 | Kaneka Corporation | 46 | |
| 16 | Sanyo Chemical Industries Ltd | 42 | |
| 17 | GM Global Technology Operations LLC | 42 | |
| 18 | Panasonic Intellectual Property Management Co Ltd | 40 | |
| 19 | Meidensha Corporation | 39 | |
| 20 | Electro Energy Inc | 36 |
Japan. Specialist US firms and European research institutions occupy the mid-tier, indicating the technology also attracts non-automotive interest in grid storage and advanced materials.
Patent records filed in the most recent 18–24 months are subject to publication lag and will under-count actual activity; trend readings for 2024–2026 should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual volume has plateaued near its 2018 peak; core battery classification dominates
The filing trend and technology composition charts together reveal a field that is technically mature in its dominant classification but still active across a broad mix of adjacent disciplines.
Annual filing trend
Annual filings peaked around 2018 (197 records) and have since moved in a band roughly between 140 and 206 records per year, consistent with a plateau rather than sustained growth. The 2025 figure (206) is notable but should be read with caution given publication lag — the 2026 figure (13) is almost certainly incomplete. The 18% multi-year growth window confirms the field is larger than it was a decade ago, but the plateau character of recent years is the dominant signal.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (Batteries, cells and fuel cells) accounts for the overwhelming majority of classified records, confirming that core electrochemical cell architecture is the primary focus. H01G (Capacitors, 242 records) is the next largest branch, reflecting work on hybrid energy-storage configurations. B60L (Electric vehicle propulsion, 129 records) and H02J (Power supply and grid systems, 83 records) indicate meaningful secondary interest in system-level integration for automotive and grid applications. All other branches trail significantly, confirming a narrow technical core with scattered adjacencies.
↗ 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 of assembling a bipolar battery and bipolar…
A method of assembling a bipolar battery, most preferably a lead-acid battery, includes assembling the electrochemical components necessary to provide the necessary voltage and capacity, maintaining the electrochemical components under the desired compression and then sealing such electrochemical components as a unit utilizing various assembly components… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Rechargeable lithium battery for use in applicatio… | 517 |
| 2 | Rechargeable lithium battery for use in applicatio… | 466 |
| 3 | Solid polymer electrolytes | 348 |
| 4 | Sealing structure of bipolar type battery | 247 |
| 5 | All-solid-state electrochemical device and method … | 242 |
| 6 | Biploar battery and its manufacturing method | 236 |
| 7 | Bipolar battery and related method | 227 |
| 8 | Bipolar battery having cooling tab | 222 |
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 observations — maturity stage, concentration, collaboration networks, and geographic coverage — each carry distinct implications for teams deciding where to direct resources.
Plateau-stage field with selective new-entrant activity
The lifecycle evidence indicates annual filings have plateaued near their 2018 peak, placing bipolar battery technology firmly in the Maturity stage. Incremental differentiation within established cell architectures is the dominant R&D mode. New entrants such as EOS Energy Technology Holdings LLC and Gridtential Energy Inc are emerging in the mid-tier, but they face an incumbent landscape where core claims are densely filed.
Maturity StageNissan’s lead creates a moat; second tier is accessible
The top five filers account for half the patent records among the hundred largest filers, with Nissan alone accounting for 957 records — a structural moat that is difficult to challenge in core cell architecture. The second tier (164–187 records each) is tighter and more contestable. Teams seeking freedom to operate should focus on sub-classes and adjacent branches where Nissan’s coverage is thinner, particularly system integration and materials.
High ConcentrationToyota–Toyota Industries and Nissan’s materials network are the dominant co-filing axes
The most active co-filing pair is Toyota Motor Corporation with Toyota Industries Corporation (61 joint records), reflecting deep vertical integration in the Toyota group. Nissan is the hub of the largest collaboration network, co-filing with Kaneka Corporation (39 records), Sanyo Chemical Industries (37 records), Kanagawa University (8 records), JSR Corporation (8 records), Kao Corporation (6 records), Renault (5 records), Tokyo University of Science (5 records), and Envision AESC Japan (2 records). EOS Energy Technology Holdings LLC and EOS Energy Storage LLC also co-file with 6 joint records.
OEM-Led NetworksUS is the primary filing jurisdiction; Europe and Japan follow
The United States leads all jurisdictions by a wide margin, followed by Europe (EPO) and Japan. China and WIPO (PCT) filings are meaningful but trail the top three. India, Germany, and Australia round out a secondary tier. This distribution suggests applicants prioritize US market protection first, with Europe and Japan as near-mandatory secondary filings. China’s position — fourth overall — signals growing but still secondary commercial attention to that market.
US-First FilingGo 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 | 61 |
| Nissan Motor Co Ltd | Kaneka Corporation | 39 |
| Nissan Motor Co Ltd | Sanyo Chemical Industries Ltd | 37 |
| Nissan Motor Co Ltd | Kanagawa University | 8 |
| Nissan Motor Co Ltd | JSR Corporation | 8 |
| Nissan Motor Co Ltd | Kao Corporation | 6 |
| EOS Energy Technology Holdings LLC | EOS Energy Storage LLC | 6 |
| Nissan Motor Co Ltd | Renault SA | 5 |
| Nissan Motor Co Ltd | Tokyo University of Science | 5 |
| Nissan Motor Co Ltd | Envision AESC Japan Ltd | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Nissan and Toyota pursue parallel but structurally distinct bipolar battery programs
The two Japanese automotive leaders each concentrate on core H01M battery classifications but differ in trajectory: Toyota is accelerating sharply while Toyota Industries is pulling back, reflecting shifting priorities within the Toyota group.
Nissan Motor Co Ltd
Nissan holds 957 patent records, the largest position in the field by a wide margin. Its technology focus is concentrated in H01M10, H01M4, and H01M2 — spanning secondary-cell design, electrode materials, and structural components — indicating comprehensive coverage of the bipolar cell stack. Applicant momentum data for Nissan is not separately broken out in the recent-period evidence, but its accumulated position and breadth of coverage establish it as the de facto standard-setter in core bipolar architecture.
patent records: 957Toyota Motor Corporation
Toyota holds 403 patent records and is the fastest-accelerating major filer in the recent window, with recent filings up ▲ +107% versus the prior three-year period. Its focus spans H01M10, H01M4, and H01M50, closely mirroring Nissan’s classification profile. This momentum — combined with Toyota Industries Corporation’s 187 records in closely related sub-classes — suggests the Toyota group is intensifying its bipolar program, potentially positioning for solid-state or next-generation bipolar cell formats.
patent records: 403| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Toyota Motor Corporation | 112 | ▲ +107% |
| Toyota Industries Corporation | 31 | ▼ -56% |
| Advanced Battery Concepts LLC | 20 | ▼ -47% |
| Nilar International AB | 2 | ▲ new entrant |
| EOS Energy Technology Holdings LLC | 49 | ▲ new entrant |
| Gridtential Energy Inc | 17 | ▲ new entrant |
| EOS Energy Storage LLC | 2 | ▲ new entrant |
Under-served adjacent branches worth monitoring
Several IPC branches adjacent to the dominant H01M core carry relatively low patent-record counts. These are observations of relative sparsity; whether they represent actionable opportunities depends on technical fit and commercial context.
H01G · Capacitors and hybrid energy storage
H01G accounts for 242 patent records — the second-largest branch but only 4% of the total classified records — indicating that bipolar architectures combining battery and capacitor functions remain sparsely covered relative to pure cell design. The technical value is plausible: bipolar supercapacitor-battery hybrids could address high-power-density applications such as regenerative braking. Entry paths exist through electrode material innovation and bipolar current-collector designs that bridge H01M and H01G sub-classes.
Search this in Eureka →B60L · Electric vehicle propulsion integration
B60L holds 129 patent records — roughly 2% of classified records — suggesting that system-level integration of bipolar batteries into EV powertrains is an under-filed area relative to the volume of cell-level work. Given the strong automotive ownership of the top applicant positions, this sparsity may reflect a deliberate separation of cell and system IP strategies, leaving potential room for Tier-1 suppliers or system integrators to establish positions in bipolar-specific BMS, thermal management, and pack architecture.
Search this in Eureka →How leading applicants 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 | H01M 6 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Nissan Motor Co Ltd | Strong · 799 | Strong · 710 | Moderate · 257 | Moderate · 381 | Emerging · 87 |
| Toyota Motor Corporation | Strong · 293 | Strong · 225 | Strong · 150 | Moderate · 63 | Emerging · 14 |
| Advanced Battery Concepts LLC | Strong · 155 | Strong · 93 | Strong · 95 | Moderate · 73 | Moderate · 54 |
| Nilar International AB | Strong · 122 | Strong · 66 | Strong · 74 | Strong · 86 | Emerging · 19 |
| Toyota Industries Corporation | Strong · 174 | Absent | Strong · 102 | Moderate · 78 | Absent |
| French Alternative Energies and Atomic Energy Commission (CEA) | Strong · 84 | Strong · 66 | Strong · 58 | Strong · 44 | Absent |
| Toshiba Corporation | Strong · 83 | Strong · 76 | Strong · 46 | Moderate · 41 | Absent |
Frequently asked questions
The analysis covers 1,584 patent families in scope globally.
Nissan Motor Co Ltd is the leading filer with 957 patent records — more than double the next-ranked applicant, Toyota Motor Corporation, at 403 patent records.
The field has reached a maturity stage. Annual filings have plateaued near their 2018 peak rather than climbing steadily. A multi-year recent-window growth of 18% indicates the field is larger than a decade ago, but annual volume is no longer consistently rising.
The United States leads with 1,217 patent records, followed by Europe (EPO) at 845, Japan at 541, China at 322, and WIPO (PCT) at 295. The US is the primary protection target, with Europe and Japan as near-mandatory secondary filings.
Toyota Motor Corporation and Toyota Industries Corporation are the most active co-filing pair with 61 joint records. Nissan Motor leads the broader collaboration network, co-filing with Kaneka Corporation (39 records), Sanyo Chemical Industries (37 records), and several others including Kanagawa University and JSR Corporation.
The two most notable adjacent branches with relatively low filing density are H01G (Capacitors, 242 records), covering bipolar hybrid energy storage, and B60L (Electric vehicle propulsion, 129 records), covering system-level EV integration. Both have plausible technical value but remain sparsely covered relative to the dominant H01M core.
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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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