I'm pretty sure if you have it set to "do not charge now" then the car won't draw power from the wall. Otherwise, if plugged in the car will heat the battery depending on temps. See Volt thermal management system temperature band?
Battery Management and Cell Balancing The pack is divided into 4 distinct management blocks each with there own group of 24 triplets to monitor. This is accomplished by four interconnected Battery Interface Control Modules (BICM). Each BICM monitors the 24 voltages and 4 temperature probes...