On March 31, 2026, the U.S. Patent and Trademark Office issued seventeen patents to GM Global Technology Operations. Spread across a grant sheet they look like routine engineering filings; grouped by subject they map a coverage position around the single most defining component of an electric vehicle's character — the electric machine — and, secondarily, the cells that feed it.

The densest theme is heat and magnetics inside the motor. The anchor grant, US12592619B2 ("Rotor shaft-mounted vapor chambers and heat pipes with endcap heat sinks for electric machines"), covers an electric machine in which heat pipes mounted on the rotor shaft passively extract thermal energy from the rotor's power-transfer circuit. Rotor heat is one of the hard limits on how much continuous torque a motor can deliver, and a granted claim on passively moving that heat out of the spinning core is enforceable coverage on a real constraint.

One or more heat pipes are mounted on the rotor shaft's outer surface and project axially between the rotor PTC and rotor core. Each heat pipe passively extracts and transfers thermal energy from the rotor PTC.— Rotor shaft-mounted vapor chambers and heat pipes with endcap heat sinks for electric machines, US12592619B2

Two further grants cover the magnet geometry that governs how efficiently the motor turns electricity into torque. US12592597B2 ("Selective permeability rotor structure for interior permanent magnet machine") covers a rotor with low-permeability inserts placed to control flux distribution and minimize leakage, and US12592596B2 ("Reluctance assisted axial flux electric motor") covers an axial-flux rotor whose ferromagnetic core saliencies are phase-shifted relative to the permanent magnets to alter the motor's magnetic reluctance. Both sit in the H02K 1 rotor-construction classes. Alongside them, US12589643B1 ("Input split hybrid architecture with independent gear piloting") covers a planetary-gear set driven by a motor/generator unit — the gearing layer of a hybrid drive unit. Taken together, the four grants give GM issued coverage across the rotor's thermal management, its magnetic design, and the gears that transmit its output.

The cell-construction block

A second, smaller cluster covers the battery cell. US12592450B2 ("Battery system with diverter assembly for thermal propagation protection") covers a diverter body arranged relative to cell vent openings that, during a thermal-propagation event, redirects high-temperature ejecta into an exhaust volume in a predetermined direction. US12592409B2 ("Apparatus for a prismatic battery cell with built-in springs") covers a prismatic cell whose built-in spring presses against the electrode stack, and US12592376B2 covers electrochemically growing a zinc-oxide layer on current collectors to mitigate lithium-dendrite growth. The diverter patent in particular is a safety-architecture claim — coverage on how a pack contains a single-cell failure — and it lands in the H01M 50 enclosure and H01M 50/3425 venting classes.

What the coverage adds up to

The remainder of the March 31 batch spreads into steering and driver-assistance — active rear steering for obstacle avoidance (US12589803B2) and a collaborative steering system that blends a driver command with an ADAS target path (US12589802B2) — plus automated platoon control and pedestrian-crossing prediction. Those are real grants, but the concentration is in the drive unit: of the seventeen patents, the H02K electric-machine and H01M battery clusters together account for the largest share, with B60Y 2200/92 (electric vehicles) tagging several.

None of these claims is a broad platform lock; they are implementation-level patents on specific mechanisms. But a granted claim is freedom-to-operate pressure on anyone building a comparable motor or pack, and the spread across rotor cooling, magnet geometry, gearing, and cell venting is the kind of layered coverage that a rival's design team has to read carefully before shipping its own drive unit. For a company whose disclosures have tied its electric-vehicle program to in-house motor and battery development, a grant day this concentrated in the machine is a record of where that development has produced enforceable positions.