On January 6, 2026, Toyota was granted patent US12515548 — "Server Apparatus and System." Behind the unassuming title lies a route optimization that could fundamentally improve EV charging.
The Problem
Lithium-ion batteries charge fastest at a specific temperature (typically 25-35 degrees C). If the battery is too cold (winter, highway driving with air conditioning), fast charging takes significantly longer — or the battery is throttled for protection. If it is too hot, likewise. Current vehicles solve this through active preconditioning: Start navigation to the Supercharger, and the car heats the battery en route.
Toyota's patent goes one step further: The optimization happens not in the vehicle, but on the server.
What the Patent Describes
A server system that calculates routes for electric vehicles with two simultaneous optimization targets:
- Timing: The vehicle arrives a predetermined time before the planned charging start
- Temperature: The battery temperature upon arrival matches the optimal charging value
The route is thus optimized not only for distance or time, but chosen so that driving conditions (gradients, speed, ambient temperature) bring the battery to the right temperature.
Patent Family
Priority: Japanese application 2023-031416 (March 1, 2023). US application: February 8, 2024. The patent runs until May 3, 2044. It is an independent application, not a continuation — Toyota is establishing foundational claims in the area of thermal preconditioning for V2G infrastructure.
Context: V2G and Regulation
Vehicle-to-Grid (V2G) is being pushed forward by regulators in several US states. California has compliance deadlines for 2027. Toyota's patent positions them for licensing revenue when charging network operators (ChargePoint, EVgo, Electrify America) and fleet management platforms implement thermally optimized route planning.
The server-side approach (instead of vehicle-side optimization) means: cloud-based charging services are the primary targets, not the automakers themselves.
Sources: USPTO US12515548, granted January 6, 2026. Japanese priority 2023-031416. ReadyDone Notable Patents Report CW2/2026 (1,693 notable patents out of 7,309 grants).