Chevy Volt electronics teardown -- "nearly 100 microcontrollers"

[FarCenter]

Teardown reveals Chevy Volt's electronic secrets

Beyond battery chemistry and electric propulsion and control, the Chevy Volt enhanced-range electric vehicle builds in flexibility, ruggedness, and diagnostics—with attention to quality construction.

http://www.edn.com/article/521722-Teardown_reveals_Chevy_Volt_s_electronic_secrets.php

Of particular interest is the battery pack, which is actively heated and cooled to maintain its temperature within 2 degrees F, even when parked. If parked for a long time, it will start the engine automatically to charge the battery before it is drained too much.