A granted patent is enforceable coverage, and the most useful thing to do with a batch of them is map where they sit in the product. In the week ending 1 June 2026, Samsung SDI Co., Ltd. — the Samsung-group cell maker that supplies EV and storage customers and has positioned itself as an all-solid-state contender — was issued a pair of battery grants that land squarely in the liquid-electrolyte cell of today, even as the company's broader granted footprint fences a deep position in the solid-state cell of tomorrow. The contrast between the week's grants and the surrounding portfolio is the map worth reading.

The two in-window grants are about making conventional cells cheaper to build and longer-lived. US12640425B2 covers a cylindrical secondary battery in which the electrode tab connects directly to the cap-up, the claim's stated purpose being to "reduce resistance and heat generation, which may occur on a current path" — a manufacturing-and-performance gain in the cylindrical format that has become central to several automakers' cell strategies. US12640401B2 claims a rechargeable lithium battery pairing a silicon-based anode with a carefully bounded cyclic-carbonate electrolyte and a coated separator. The abstract states the payoff in plain terms:

The rechargeable lithium battery has improved cycle-life and high temperature storage characteristics.— Rechargeable lithium battery, US12640401B2

Those two grants share a logic: both target the durability and cost of liquid-electrolyte cells that are shipping now. The cylindrical-tab grant is a throughput and resistance play in a format Samsung SDI builds in volume; the silicon-electrolyte grant is coverage on the chemistry combination that lets a silicon anode survive more cycles. Together they fence parts of the cell where incremental, enforceable gains translate into qualification wins with cell buyers.

The footprint behind the week is solid-state

What makes the week's grants more interesting is what surrounds them in Samsung SDI's recent issued portfolio: a concentration of all-solid-state architectures. US12658511B2 claims an all-solid secondary battery with a negative-electrode layer that contains little or no solid electrolyte and an exterior casing with a cushioning layer. US12658480B2 covers a bipolar stacked unit-cell structure with a compression pad between bicells to absorb the anode's volume change, and US12658467B2 describes a stacked all-solid-state battery with a buffer layer between units. These are not stray filings; they describe the recurring engineering problem of solid-state cells — managing the mechanical stress and volume change that a rigid, all-solid stack has to survive — and Samsung SDI holds issued claims on several distinct answers to it.

Quantifying the footprint underscores the point. Samsung SDI's granted U.S. battery portfolio runs to several thousand records, concentrated in the H01M lithium-cell classes, with cell-chemistry classifications (H01M 10/0525, H01M 4/525) and the solid-electrolyte class H01M 10/0562 recurring across its solid-state grants. The week's two liquid-cell grants are drawn from the same continuous program that produced the all-solid-state set — the company is accumulating enforceable coverage across both the format it ships today and the one it is building toward.

What the dual coverage buys

For a reader weighing the storage and EV-cell landscape, mapping this coverage is about freedom-to-operate across two timelines. The cylindrical and silicon-electrolyte grants define fenced zones in cell formats that are being qualified and purchased now; a competitor optimizing a comparable cylindrical cell or a silicon-anode electrolyte has to account for them. The all-solid-state grants stake out coverage in a format that is not yet a volume market — coverage that compounds in value the closer solid-state gets to production, because the companies that hold issued claims on the stress-management and stacking problems are the ones whose IP a future solid-state supply chain has to route around. None of these patents disclose how the cells perform in the field, and a grant is not a shipping product. What the batch establishes is the factual shape of the position: enforceable coverage spanning both the current and the next cell format, accumulated in one continuous filing program.

The caveats are standard for any coverage map. A patent fences what its claims describe, not the broad theme its title implies, and the scope of each grant is narrower than a one-line summary. The all-solid-state grants in particular cover specific structures — a cushioning layer, a compression pad, a buffer layer — not solid-state cells in general. But the read here rests on the shape of the set, not a single grant: a company issued liquid-cell durability patents in the same window that its portfolio is fencing all-solid-state stacking and stress management is one building coverage across the cell formats of two different eras at once.