When people picture EV charging infrastructure, they picture the plug. But the company that operates a charging network spends its engineering effort on the system behind the plug — the coordination, the safety logic, the negotiation with each car's battery. A 2022 grant from ChargePoint, one of the largest network operators, is a useful look at what that company actually thought was worth patenting.
The record: on November 29, 2022, ChargePoint, Inc. was granted US11515586B2, an “Electric vehicle charging system.” The revealing part is the CPC mix. Charging classes B60L 53/16 and 53/302 sit right next to battery thermal-management classes — H01M 10/63, 10/6568, 10/625 — and charge-control class H01M 10/44. The operator's charging system is classified partly as a battery-thermal patent, because the two cannot be separated.
Here is why charging and thermal state are inseparable. How fast a pack can safely accept charge depends on its temperature. A cold pack charges slowly; a hot pack risks damage if pushed; only a pack in its thermal sweet spot can take full power. A charging system that ignores the pack's temperature either undercharges (too cautious) or endangers it (too aggressive). The system has to read the battery's thermal state and shape the charge accordingly.
Trace it to the product and the significance is the handshake. A modern fast charge is a continuous negotiation: the car tells the charger its battery's state, and the charger modulates power in response. The operator's system has to handle that negotiation across every make and model that plugs in, safely, while maximizing speed. A patent that braids charging control with thermal management is a patent on that handshake.
Why does the operator, not the automaker, patent here? Because the charger sits at the boundary between the network's hardware and the car's battery, and reliability at that boundary is the operator's product. A network that charges fast on a warm car and gracefully on a cold one — without ever harming a pack — is a network drivers trust. That trust is built in the charging-thermal logic, not the connector.
The caveat: the grant covers a specific charging-system design, not the whole network or every protocol. But it makes the operator's real concern visible. Uptime is the metric that matters, and uptime depends on charging that respects the battery on the other end of the cable. A 2022 ChargePoint grant shows that, for a network operator, charging is fundamentally a conversation with the pack's temperature.