Battery Management Systems Patent Landscape 2026
Battery Management Systems Patent Landscape in 2026
Battery management systems IP is dominated by a small cohort of Korean and Chinese cell makers, with LG Energy Solution holding a commanding lead among the top hundred filers. The field reached its annual peak in 2021 and has since plateaued, signaling a maturing but still actively contested technology space.
LG Energy Solution leads a highly concentrated field
LG Energy Solution ranks first among the top hundred filers in battery management systems, followed by Samsung SDI and Contemporary Amperex Technology (CATL). The top five filers together account for 49% of the combined patent records of the hundred largest filers, signaling a pronounced concentration at the apex of this space.
A clear two-tier structure is visible: LG Energy Solution’s record count is roughly 2.7 times that of Samsung SDI at rank two, and Samsung SDI in turn holds nearly twice the records of CATL at rank three. Below rank five, counts drop sharply, with the remaining applicants each holding well under 10% of the leader’s volume.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | LG Energy Solution Ltd | 11,212 | |
| 2 | Samsung SDI Co Ltd | 4,095 | |
| 3 | Contemporary Amperex Technology Co Ltd | 2,024 | |
| 4 | Contemporary Amperex Technology (Hong Kong) Limited | 1,390 | |
| 5 | Robert Bosch GmbH | 1,376 | |
| 6 | Samsung Electronics Co Ltd | 1,164 | |
| 7 | BYD Co Ltd | 1,089 | |
| 8 | LG Chem Ltd | 1,072 | |
| 9 | Hyundai Motor Co Ltd | 973 | |
| 10 | Toyota Motor Corporation | 692 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA) | 536 | |
| 12 | Huawei Digital Power Technologies Co Ltd | 536 | |
| 13 | Eve Energy Co Ltd | 521 | |
| 14 | Ford Global Technologies LLC | 498 | |
| 15 | SK On Co Ltd | 492 | |
| 16 | GM Global Technology Operations LLC | 488 | |
| 17 | CPS Technology Holdings LLC | 487 | |
| 18 | Zhejiang Geely Holding Group Co Ltd | 288 | |
| 19 | SVOLT Energy Technology Co Ltd | 276 | |
| 20 | Ningde Amperex Technology Ltd | 266 |
The scale of LG Energy Solution’s and Samsung SDI’s portfolios, both anchored in battery cell management (H01M), power supply systems (H02J), and electrical measurement (G01R), suggests deep defensive coverage of core BMS functionality. Challengers seeking freedom to operate will need to navigate dense claim landscapes in these three dominant technology branches.
Filing counts for 2024 and 2025 are under-counted due to standard patent publication lag; apparent softening in those years should not be interpreted as a real decline in activity.
Annual volume plateaued near its 2021 peak; core electrochemistry and power-supply classes dominate
The filing trend chart shows how BMS activity built steadily from 2017 to a 2021 peak and has since leveled off. The technology composition chart reveals that three IPC classes — H01M (batteries and cells), H02J (power supply systems), and G01R (electrical measurement) — account for the large majority of filings, with EV-specific class B60L a strong fourth.
Annual filing trend
Filings grew consistently from 2017 through 2021, then plateaued. The 2024 and 2025 bars reflect publication lag and undercount actual recent activity — do not read them as evidence of a real downturn.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries and cells) and H02J (power supply and grid systems) are nearly co-equal in volume, together comprising the majority of classified records. G01R (measurement) and B60L (EV propulsion) form a secondary tier, reflecting the importance of state-estimation and vehicular integration in modern BMS design. Several adjacent branches — including G06F (digital data processing), H02H (protective circuits), and H02M (power conversion) — appear at significantly lower volumes, pointing to areas of relative sparsity.
↗ Hover for values · click a bar to ask EurekaFoundational and most-cited patents
The most-cited families that anchor this space. Hover a row and click to open it in Eureka.
Device for estimating state of health of battery, …
A device for estimating state of health of battery, and a state of health estimation method with improved estimation accuracy of the state of health of the battery are provided. The device for estimating state of health includes: a charge and discharge current detection unit (<b>1</b>); a terminal voltage detection unit (<b>2</b>); a first state of charge… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Charging system that enables emergency resolutions… | 2,174 |
| 2 | Surgical apparatus configured to track an end-of-l… | 2,150 |
| 3 | Power adapter for a surgical instrument | 2,098 |
| 4 | Reinforced battery for a surgical instrument | 1,777 |
| 5 | Surgical apparatus configured to assess whether a … | 1,605 |
| 6 | Methods of charging battery packs for cordless pow… | 1,478 |
| 7 | System for monitoring whether a surgical instrumen… | 1,399 |
| 8 | Battery pack for cordless power tools | 1,069 |
Ranked by total forward citations. Citation counts accrue over time, so this list favours older, broadly-cited patents and may include general-purpose work beyond the specific topic; treat it as foundational context rather than a current-activity ranking.
What the competitive structure means for R&D investment
The combination of a maturing lifecycle, high top-tier concentration, and active OEM-supplier co-filing defines the strategic terrain for new entrants and incumbents alike.
Field has plateaued near its 2021 peak
Annual BMS filings peaked in 2021 and have since plateaued, placing the field at a Maturity stage on a multi-year basis — the recent-window growth figure of 9% reflects cumulative expansion, not fresh acceleration. Incremental improvements in state-of-charge estimation, thermal management, and cell balancing characterize the current innovation cadence. New entrants face a crowded prior-art landscape and should prioritize differentiated sub-functions rather than broad system claims.
Lifecycle: MaturityTop five account for half of the largest filers’ combined records
The top five filers hold 49% of the combined patent records of the hundred largest filers, a level of concentration that reflects years of sustained investment by Korean and Chinese cell manufacturers. The gap between rank one (LG Energy Solution) and rank two (Samsung SDI) is particularly large, indicating a dominant incumbent rather than a closely contested duopoly. Entrants targeting core H01M/H02J claims will encounter dense portfolios; adjacent branches remain comparatively open.
High concentrationHyundai–Kia and Samsung SDI–Bosch are the most active co-filing pairs
The most active co-filing relationship is between Hyundai Motor and Kia, with 236 jointly filed records, reflecting integrated OEM-level BMS development. Samsung SDI and Robert Bosch follow with 146 joint records, illustrating a cell-supplier/systems-integrator partnership model. Smaller co-filing clusters exist within the CATL group (CATL with its software and Shanghai research subsidiaries) and between BYD and its Fang Cheng Bao sales affiliate. These pairings suggest that vertical integration and strategic supplier alliances are the dominant collaboration pattern in this field.
Partnership-drivenUS and EPO lead; PCT routes signal further expansion intent
The United States is the primary filing jurisdiction by a wide margin, followed by the European Patent Office and WIPO PCT filings. Australia and Canada represent secondary anglophone markets with notable but smaller footprints. The relatively low direct-filing counts for Japan, South Korea, and Germany suggest that many applicants — particularly Korean and Chinese firms — prosecute primarily through the US and EPO routes rather than their home offices in this corpus. India, with only 22 records, remains an underserved major market.
US-EPO dominantGo 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 |
|---|---|---|
| Hyundai Motor Co Ltd | Kia Corporation | 236 |
| Samsung SDI Co Ltd | Robert Bosch GmbH | 146 |
| Samsung SDI Co Ltd | Samsung Electronics Co Ltd | 13 |
| BYD Co Ltd | Shenzhen Fang Cheng Bao Automobile Sales Co Ltd | 13 |
| Contemporary Amperex Technology Co Ltd (CATL) | Contemporary Amperex Runzhi Software Technology Co Ltd | 8 |
| Contemporary Amperex Technology Co Ltd (CATL) | CATL Future Energy (Shanghai) Research Institute Co Ltd | 6 |
| LG Chem Ltd | Silicon Works Co Ltd | 5 |
| Hyundai Motor Co Ltd | Hyundai Transys Inc | 5 |
| Kia Corporation | Hyundai Transys Inc | 5 |
| Samsung SDI Co Ltd | University of Michigan Board of Regents | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
LG Energy Solution leads; Samsung SDI accelerating fastest among top filers
The top two players share a common technology emphasis across H01M, H02J, and G01R, but diverge sharply in recent momentum — Samsung SDI’s recent filings have surged while several other top-ten incumbents have pulled back.
LG Energy Solution
LG Energy Solution is the clear leader with 11,212 patent records, built on a core focus spanning battery cell management (H01M), power supply systems (H02J), and electrical measurement (G01R). Recent filing momentum is positive at +36% versus the prior three-year period, indicating that the firm is actively reinforcing its already substantial position rather than coasting on legacy filings.
patent records: 11,212Samsung SDI
Samsung SDI ranks second with 4,095 patent records and is the fastest-growing major filer in recent periods, with recent filings up +88% versus the prior three years — the highest momentum among the top applicants tracked. Its technology emphasis mirrors the leader’s (H02J, H01M, G01R) but with a slightly greater weighting toward power supply systems. The +88% jump from a large absolute base makes Samsung SDI the most aggressive challenger in terms of current filing pace.
patent records: 4,095| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| LG Energy Solution Ltd | 1,013 | ▲ +36% |
| Samsung SDI Co Ltd | 242 | ▲ +88% |
| LG Chem Ltd | 3 | ▼ -99% |
| Contemporary Amperex Technology Co Ltd (CATL) | 272 | ▼ -45% |
| Samsung Electronics Co Ltd | 119 | ▼ -44% |
| Robert Bosch GmbH | 24 | ▼ -58% |
| Hyundai Motor Co Ltd | 93 | ▲ +37% |
Under-served branches adjacent to the BMS core
Five IPC branches appear at markedly lower volumes relative to the dominant H01M/H02J/G01R cluster. Two stand out for their plausible technical relevance to BMS evolution and realistic entry paths for teams with the right expertise.
G06F · Electric digital data processing
With only 503 records against the multi-thousand-record core branches, G06F is sparsely populated relative to its functional importance in modern BMS software — covering algorithms for state estimation, predictive analytics, and embedded control logic. As BMS increasingly shifts toward software-defined architectures and AI-assisted diagnostics, this branch represents an adjacent area where a team combining battery domain knowledge with embedded-systems or ML expertise could establish differentiated positions without immediately colliding with the densest incumbent portfolios.
Search this in Eureka →H02H · Protective circuit arrangements
H02H, covering protective circuit arrangements such as overcurrent, overvoltage, and fault-detection circuits, shows only 391 records — low given that protection circuitry is a fundamental BMS function. This relative sparsity may reflect that protection logic is often claimed within broader H01M or H02J families rather than classified separately, but it also suggests that purpose-built protective circuit innovations — particularly for high-voltage EV and grid-storage applications — may encounter less prior-art friction here. Firms with circuit-design capabilities could find this an accessible adjacent branch.
Search this in Eureka →How leading BMS filers differ by technology route
Strength of each leader across the main technology routes.
| Player | H01M 10 · Batteries, cells & fuel cells | H02J 7 · Power supply & grid systems | G01R 31 · Electric & magnetic measurement | H01M 50 · Batteries, cells & fuel cells | B60L 58 · Electric vehicle propulsion |
|---|---|---|---|---|---|
| LG Energy Solution Ltd | Strong · 1,293 | Strong · 789 | Strong · 1,178 | Moderate · 270 | Moderate · 317 |
| LG Chem Ltd | Strong · 904 | Strong · 557 | Strong · 596 | Moderate · 381 | Emerging · 74 |
| Samsung SDI Co Ltd | Strong · 701 | Strong · 712 | Strong · 441 | Moderate · 253 | Emerging · 63 |
| Contemporary Amperex Technology Co Ltd (CATL) | Strong · 489 | Strong · 396 | Strong · 356 | Emerging · 60 | Moderate · 153 |
| Samsung Electronics Co Ltd | Strong · 225 | Strong · 408 | Strong · 241 | Absent | Absent |
| Robert Bosch GmbH | Strong · 288 | Strong · 246 | Strong · 216 | Moderate · 84 | Absent |
| Hyundai Motor Co Ltd | Strong · 178 | Strong · 141 | Strong · 116 | Absent | Strong · 103 |
Frequently asked questions
LG Energy Solution is the top-ranked filer with 11,212 patent records among the top-100 applicants, roughly 2.7 times the count of second-ranked Samsung SDI (4,095 records). Its portfolio is concentrated in battery cell management (H01M), power supply systems (H02J), and electrical measurement (G01R).
Annual filings grew steadily from 2017 through 2021, when they reached their peak. Since then, annual volume has plateaued near that peak level. The overall field remains active on a multi-year basis, with a 9% recent-window growth figure, but the pace of year-on-year expansion has eased. Note that 2024 and 2025 counts are under-counted due to patent publication lag.
Three branches dominate: H01M (batteries, cells, and fuel cells), H02J (power supply and grid systems), and G01R (electric and magnetic measurement). B60L (electric vehicle propulsion) forms a strong secondary tier. Together these four classes account for the large majority of classified records in the corpus.
The United States is the primary jurisdiction by a substantial margin, followed by the European Patent Office and WIPO PCT filings. Australia and Canada are the leading secondary anglophone markets. India, Japan, South Korea, and Germany show comparatively low direct-filing counts in this corpus.
The most active co-filing pair is Hyundai Motor and Kia, with 236 jointly filed records. Samsung SDI and Robert Bosch follow with 146 joint records, reflecting a cell-supplier/systems-integrator model. Smaller clusters exist within the CATL group and between BYD and its Fang Cheng Bao affiliate.
Relative to the dominant H01M/H02J/G01R cluster, the branches G06F (digital data processing, 503 records) and H02H (protective circuit arrangements, 391 records) are materially sparser. These branches are adjacent to core BMS functions — embedded control algorithms and fault-protection circuits — and may offer more accessible entry paths for teams with differentiated capabilities in those areas.
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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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