The number is in the filing or it isn't, and on April 28, 2026, the filing said 28: that is how many US patents the United States issued to GM Global Technology Operations in a single grant window. For a desk that reads issued coverage as a capital position rather than a press item, the block is interesting less for its size than for its concentration. Unlike a grant spread that runs the length of the vehicle, this one clusters tightly on the electrified powertrain — the battery, the power electronics and the electric machine, the three most capital-intensive lines on an EV's bill of materials.

Start with the cell, where several grants land. US12614753B2 claims a semi-solid-state electrolyte system pairing an oxysulfide solid-state electrolyte with a solvate ionic liquid, classified in the H01M 10 lithium-battery family. US12614722B2 covers a voltage-control strategy for batteries with lithium- and manganese-rich (LMR) cathodes, shifting the voltage window as capacity fades — a method tied to a cathode chemistry the industry has been working toward for cost reasons. US12614821B2 claims a high-energy-density cylindrical cell design with stacked electrodes and a cut-out perimeter that creates room for the tabs and connections. These are structure and control claims on the cell itself, the unit whose cost and energy density set the economics of the whole vehicle.

The block then moves to the safety layer around the cell, which reads as a liability line as much as an engineering one. US12614808B2 claims manufacturing methods for a battery-cell support assembly with integrated thermal-runaway mitigation, using a cell holder, thermal-barrier strips and potting elements to channel runaway energy away from an affected cell and out of the enclosure without triggering adjacent cells.

The resultant cell support assembly operates to channel thermal runaway energy away from the affected battery cell(s) and out of the RESS enclosure without triggering thermal runaway in adjacent cells.— Manufacturing methods for battery cell support assembly with integrated thermal runaway mitigation, US12614808B2

That containment claim sits next to the test bench. US12613205B2 covers a method for performing differential scanning calorimetry (DSC) measurement of battery cells — arranging a cell sample in a test crucible with a spacer, sealing it and running the thermal test. Read alongside the runaway-mitigation grant, the picture is of a company holding issued coverage on both containing a thermal event and measuring the cell's thermal behavior in the lab. For a markets reader, thermal runaway is the line item where a recall and a warranty reserve live; issued coverage on its mitigation and measurement is coverage on the most expensive failure mode in the product.

From the inverter to the electric machine

The power-electronics and motor content is the other half of the cluster. US12614968B2 claims a power-module design that minimizes parasitic inductance by arranging high-side, low-side and AC-output buses in parallel planes with currents flowing in opposing directions — an inverter claim classified in the H02M power-conversion family. US12614941B2 covers an axial-flux electric machine with cooling-channel loops surrounding each stator magnetic pole to carry away heat, and US12614947B2 claims an axial brush assembly for an electric machine with conical projections engaging slip rings. These are hardware claims on the inverter that converts the battery's DC to AC and the motor that turns it into torque — the components that, with the pack, define an EV's performance and cost.

Charging closes the loop. US12611962B2 claims a system for dynamic control of battery charging that estimates an electrochemical performance variable in real time, selects a stored charging profile, and updates that profile through a reward-based learning process. It is issued coverage on the software that decides how fast and how hard the pack is charged — a determinant of both charging speed and long-run pack life.

Reading the concentration as a position

Step back and the day's grants sort into a tight set of zones, all on the electrified powertrain: the cell chemistry and design, the thermal-runaway containment and testing around it, the inverter power electronics, the electric machine, and the charging-control software. The classification facets confirm the concentration rather than a spread — the batch leans heavily on the H01M battery family and the H02M and H02K power-conversion and motor families, with the B60L electric-propulsion family recurring across the charging and control claims.

For a markets reader, the financial reading is about where coverage is being added, expressed in counts and classes rather than a thesis. Every zone in this block is a cost line on an EV that GM builds: the cell, the safety enclosure that gates its recall exposure, the inverter, the motor, and the charging logic that affects warranty and customer experience. Issued patents on those items are coverage on the parts where an electric vehicle's capital and liability concentrate. The 28-grant block documents the company adding issued positions across that powertrain on the same date, rather than scattering them across the cabin and body.

It is worth being precise about what a grant block does and does not establish. These are issued claims, enforceable as of April 28, 2026; whether or how GM chooses to enforce any of them is a separate matter the record does not speak to. What the day establishes is the map: as of that date, GM holds fresh issued coverage concentrated on the battery, the power electronics and the electric machine, documented in 28 patent numbers with the company on the assignee line. For a desk tracking where an automaker's defensible positions sit, the concentration of this block on the powertrain — not any single claim — is the data point.