The leader in this dataset holds 7 of the 92 records in scope, with the fifth-ranked assignee at 4 and the tenth-ranked at 3. The top 10 ranked assignees together account for 46 records, exactly half of the field, while the remaining names in the 70-company ranking each hold only a handful of filings. That pattern — a modestly concentrated top tier over a long tail — means no single company controls the space outright, but a newcomer should still check the top 10's claims first.

Filings rose from 1 in 2021 to 9 in 2024, a +800% increase over that three-year span, with the highest single-year count so far being 17 in 2025. Because patent publication typically lags actual filing by around 18 months, the 2025 and 2026 figures will keep revising upward as more applications publish, so the 2024 figure is the most reliable read on recent momentum. Treat any apparent flattening in the newest years as a data-lag artefact rather than a real slowdown.

H01M, the batteries, cells and fuel cells classification, covers 93.5% of the 92 records and is the dominant class by a wide margin. H02J, power supply and grid systems, appears in 22.8% of records, and G01R, electric and magnetic measurement, in 12.0%, indicating a real secondary cluster of charge-control circuitry and monitoring claims layered on top of the core cell chemistry. Smaller classes such as C01D and C08F each sit at 4.3% or below, reflecting thinner but present activity in electrolyte and polymer chemistry adjacent to the charging protocol itself.

China's receiving office accounts for 49 of the tracked filings, well ahead of the United States at 14, WIPO/PCT filings at 9, the European Patent Office at 7, South Korea at 6 and Canada at 2. That skew toward China suggests domestic filers are driving much of the recent volume, and any freedom-to-operate review should weight Chinese national-phase filings rather than relying on PCT or US-only searches. It also means a large share of the underlying claim language may only be available in Chinese-language source documents.

Several IPC subclasses adjacent to the core H01M claims — C01D, C08F, C08G, C08J and B82Y — each appear in only 4.3% or fewer of the 92 records, suggesting comparatively light claim density in electrolyte compound, polymer and nanomaterial angles on fast charging. That does not guarantee a clean path, since some of that thinness reflects narrower applicability rather than open opportunity, but it is a reasonable place to start a novelty search. Combined with the long tail below the top 10 assignees, it indicates the field is still young enough for new entrants to stake distinct claim territory.