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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/battery-management-systems-patent-landscape-patent-landscape/ · Patsnap · data cut-off 2026-08-31 · downloaded from the live page
Patent Landscape · Battery Management SystemsBattery-management system patents: who holds the ground and where it's still open
- 22.6% concentration at the top. The five leading assignees account for 10,364 of 45,902 records in scope — a dense cluster but still a minority of the field.
- Filing has plateaued, not collapsed. Volume moved from 2,057 records in 2021 to 1,909 in 2024, a -7% shift over three years, after peaking at 2,357 in 2022.
- Measurement and control classes dominate. Power supply/grid systems (18.0%) and battery/cell hardware (17.0%) lead the IPC mix, with EV propulsion and electric measurement close behind at 13.7% each.
45.9K
Published Records
23%
Top-5 Share of All Records
-7%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (2,057 records) with 2024 (1,909) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 45,902 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What the battery-management system patent record shows
Battery-management systems sit at the intersection of power electronics, electrochemistry and control software, and the patent record reflects that split. Records in scope span state-of-charge estimation, charge-cycle management, and grid-facing power supply claims, with a meaningful share also touching vehicle propulsion and digital measurement. The dataset covers 45,902 published records filed between 2015 and the 2026 cut-off, drawn from a search built around battery management, state estimation and the surrounding electrochemical and control terminology.
Filing offices skew heavily toward the United States, with the EPO and WIPO's PCT route as the next largest receiving offices. That pattern points to a field where applicants are securing broad early protection in the US market before deciding which other jurisdictions warrant the cost of national phase entry.
Filing activity and technology split, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Data
Filing trends and technology composition
Two views of the same 45,902-record dataset: how filing volume has moved year over year, and how records distribute across IPC subclasses. Because a single record can carry several IPC codes, the class shares below sum to more than 100%.
Filing trend, 2017–2026
Annual filings rose from 1,013 in 2017 to a peak of 2,357 in 2022, then eased to 1,909 by 2024 — a -7% move over the 2021-2024 span. 2025 and 2026 figures are still incomplete because publication typically lags filing by around 18 months; treat the tail of the trend as a floor, not a decline.
IPC subclass composition
Power supply and grid systems (H02J) and core battery/cell hardware (H01M) each cover roughly a sixth of all records, with EV propulsion (B60L) and electrical measurement (G01R) close behind. Software-adjacent classes — digital data processing and digital information transmission — appear in a much smaller but still notable slice of filings.
Shares are the percentage of the 45,902 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and most-cited prior art
Representative record
Battery state estimation device, system, and method (US20240094303A1)
NUVOTON TECHNOLOGY CORPORATION JAPAN
The device runs two independent state-of-charge calculations from a battery model and compares them; when the two diverge past a set threshold, it triggers an AC impedance measurement, recalculates the underlying battery model parameter from that measurement, and feeds the corrected parameter back into the first SOC calculation.Filed by Nuvoton Technology Corporation Japan, published 2024-03-21.
Most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US9026347B2 | Smart electric vehicle (EV) charging and grid integration apparatus and methods | 1,039 |
| 2 | US9337668B2 | Viral distribution of battery management parameters | 836 |
| 3 | US9197079B2 | System and method for tracking and archiving battery performance data | 833 |
| 4 | US9099877B2 | Battery management system for control of lithium power cells | 825 |
| 5 | US20150224845A1 | Active vehicle suspension system | 700 |
| 6 | US20110204720A1 | Efficient usage, storage, and sharing of energy in buildings, vehicles, and equipment | 598 |
| 7 | US20130179061A1 | Smart electric vehicle (EV) charging and grid integration apparatus and methods | 589 |
| 8 | US5487002A | Energy management system for vehicles having limited energy storage | 523 |
| 9 | US20170005515A1 | Renewable energy integrated storage and generation systems, apparatus, and methods with cloud distributed ene… | 505 |
| 10 | US6169387B1 | Battery management apparatus for portable electronic devices | 492 |
Citation counts favour older, earlier-published records within this corpus; treat them as a measure of influence on later filings, not as a ranking of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing or freedom-to-operate decision
Three patterns stand out once the ranking, the trend and the IPC split are read together: the field is contested but not locked up, growth has levelled off rather than reversed, and the classification data hints at where software-driven claims are still comparatively thin.
Concentration
22.6% of 45,902 records
top 5 combined share
The top of the field is dense but not closed
The five leading assignees hold 10,364 of the 45,902 records in scope, and the leading assignee alone accounts for 4,479. That leaves close to four-fifths of the field outside the top five, spread across a long tail of automakers, cell makers and component suppliers.
Ranked leaders, 100 companies
Momentum
-7% (2021→2024)
three-year filing change
Volume has settled after a 2022 peak
Filings peaked at 2,357 in 2022 and eased to 1,909 by 2024, a -7% shift. That is a plateau off a high point, not a downturn — and the 2025-2026 figures are still filling in given the typical 18-month publication lag.
Peak year: 2022 at 2,357 records
Technology mix
18.0% H02J, 17.0% H01M
share of 45,902 records
Power and cell hardware claims lead the mix
Power supply and grid systems and core battery/cell hardware are the two largest IPC subclasses, each covering roughly a sixth of records. EV propulsion and electrical measurement classes are close behind, while digital-processing and digital-transmission classes cover a much smaller share.
8 IPC subclasses tracked
Filing geography
10,940 US filings
leading receiving office
Protection concentrates in the US before spreading out
The United States receives more than double the filings of the EPO, with WIPO's PCT route third. That pattern is consistent with applicants securing a US position first and using PCT or direct EPO filings selectively rather than filing broadly across every market from day one.
EPO 5,182 · PCT 2,322 · UK 488
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to battery-management systems patent landscape, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gaps sit
The ranked leaders span battery cell makers, automakers and consumer electronics firms, several of which co-file with allied entities. Recent-year momentum has cooled across nearly every tracked assignee, consistent with the broader plateau in the trend data, though this is also where the publication lag bites hardest.
Leader
4,479 records
single largest assignee
One cell/battery maker sets the pace
The leading assignee's record count is roughly five times that of the fifth-placed company (939), making it the clearest single point of reference for freedom-to-operate checks in this space.
Fifth place: 939 records
Co-filing
573 shared records
strongest co-assignee pair
Automaker pairs file jointly at meaningful scale
The strongest co-assignee pairing in the dataset links two affiliated automakers at 573 shared records, far ahead of the next pairings (73 and 21 records), suggesting a tightly coordinated internal filing program rather than incidental overlap.
10 co-assignee pairs identified
Momentum
-63% to -100% YoY
recent-year change, tracked assignees
Recent-year counts have dropped sharply across the board
Every tracked assignee in the momentum data shows a steep year-over-year decline in the latest year, from -63% down to -100%. Given the roughly 18-month publication lag, this is best read as incomplete recent data rather than a genuine pullback in R&D activity.
Latest-year counts, single digits per assignee
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Contemporary Amperex Technology Co., Ltd. (CATL) | 6 | -63% |
| LG Energy Solution Ltd | 5 | -97% |
| Samsung SDI Co Ltd | 5 | -96% |
| Ford Global Technologies LLC | 2 | -75% |
| Samsung Electronics Co Ltd | 1 | -88% |
| Hyundai Motor Co Ltd | 0 | -100% |
| LG Chem Ltd | 0 | — |
| Kia Corporation | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, whitespace filing, or tracking a named competitor.
Run a freedom-to-operate check against the leader's portfolio
With one assignee holding 4,479 records, any new BMS filing touching state-of-charge estimation or charge-cycle control should be checked against that portfolio specifically, not just the field average.
Explore assignee portfolios in EurekaPressure-test the under-claimed branches
Digital transmission and hybrid-vehicle control classes carry a smaller share of records than core hardware and measurement classes — worth a deeper claim-scope check before assuming the space is open.
Search whitespace in EurekaWatch the 2025-2026 filings as they publish
Given the roughly 18-month publication lag, the real trajectory of 2024-2026 filing activity will not be visible for another year or so; set an alert rather than reading the current tail as a trend.
Set up monitoring in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about battery-management system patents
One assignee leads the ranked field with 4,479 records, well ahead of the fifth-placed company at 939. The top five combined account for 10,364 records, which is 22.6% of the 45,902 records in scope, so while the leader is dominant, the majority of filings sit outside the top five. A freedom-to-operate review should start with the leader's portfolio specifically rather than assuming the field average applies.
Filing peaked at 2,357 records in 2022 and eased to 1,909 by 2024, a -7% change over that three-year span, which reads as a plateau rather than a decline. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so the most recent years will fill in as more applications are published. Any growth or decline claim should be anchored to 2021-2024, the last span with reasonably complete data.
Power supply and grid systems (H02J) and core battery/cell hardware (H01M) are the two largest IPC subclasses, each covering roughly a sixth of the 45,902 records in scope. EV propulsion (B60L) and electrical measurement (G01R) follow closely at 13.7% each. Because records can carry multiple IPC codes, these shares add up to more than 100% and should be read as coverage, not as mutually exclusive categories.
The classification data shows a much smaller share of records touching digital data processing and digital information transmission compared with core hardware and measurement classes, and hybrid/joint vehicle control also carries a comparatively small share. These are not necessarily easy to file into, but they are less occupied by the volume of hardware and measurement claims that dominate the rest of the field. A targeted claim search in those specific classes is the practical next step before committing to a filing strategy there.
US20240094303A1, filed by Nuvoton Technology Corporation Japan and published in 2024, illustrates a common structural pattern: two independent state-of-charge calculations are cross-checked, and a discrepancy beyond a threshold triggers an AC impedance measurement that feeds a corrected battery-model parameter back into the estimation loop. This dual-estimation-with-correction structure appears as a recognizable approach across the corpus. Anyone drafting claims in adjacent SOC-estimation territory should check overlap with this specific correction-trigger mechanism.
Answers are grounded in the same dataset. Derived from a Patsnap search on Battery-Management Systems Patent Landscape covering 2015–2026, data cut-off 2026-08-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.