Drive Motor Battery System Description: Overview: Notes

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The drive motor generator battery is also referred to as the hybrid battery. The drive motor generator battery contains 40 individual battery modules. Each battery module is rated at 7.2 volts direct current (DC) and all the modules are connected together in series. The combined output voltage of all the modules is about 288 volts DC. The DC high voltage (HV) connects to the drive motor/generator power inverter module (PIM) through HV DC cables that route underneath the vehicle. The HV battery positive and negative cable assembly (300v) is always colored orange to denote the potential for high voltage. The PIM converts the DC voltage to alternating current (AC) voltage to enable the electrical portion of the powertrain hybrid functions. The drive motor/generator battery has few moving parts. The moving parts are the 2 HV contactor relays, the HV current limit relay, the battery vent fan relay and a battery vent fan. The vent fan is used to help cool the batteries. The battery energy control module (BECM) controls these devices and monitors current, voltage and temperature by using several sensors within the hybrid battery assembly. The BECM will set diagnostic trouble codes based on these inputs.