Battery System, Hybrid Drive: Description and Operation

High-Voltage Traction Battery

WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: The High Voltage Traction Battery (HVTB) in a Hybrid Electric Vehicle (HEV) can be affected and damaged by excessively high temperatures. The temperature in some body shop paint booths can exceed 60°C (140°F). Therefore, during refinishing operations, the paint booth temperature must be set at or below 60°C (140°F) with a bake time of 45 minutes or less. Temperatures in excess of 60°C (140°F) or bake durations longer than 45 minutes will require the HVTB (High Voltage Traction Battery) be removed from the vehicle prior to placing in the paint booth.

The vehicle is principally powered by an internal combustion engine, much like any ordinary vehicle. However, it also transforms the energy that is normally wasted during stop and go operation (when coasting and braking) into electricity, which is stored in the High Voltage Traction Battery (HVTB) until the moment it is needed by the Electronically Controlled Continuously Variable Transmission (eCVT) traction motor or the 12-volt system. The traction motor is used to support the engine during acceleration and uphill driving. In low-speed driving situations, the vehicle may move under only battery power, without the internal combustion engine running. The internal combustion engine may automatically shut off when the vehicle is stopped/idling or when coasting under 75 km/h (47 mph) and will restart when the accelerator is depressed, when the traction motor needs assistance, or if the HVTB (High Voltage Traction Battery) state-of-charge is low. This avoids using excess fuel when the vehicle is not in motion. The vehicle does not need to be plugged into an external source of electricity to be recharged. The energy provided by the engine and the regenerative braking, via the eCVT (Electronically Controlled Continuously Variable Transmission) traction motor and generator motor, charges the HVTB (High Voltage Traction Battery).

The HVTB (High Voltage Traction Battery) assembly, located behind the rear seat backrest, consists of the following components:

- HVTB (High Voltage Traction Battery)

- HVTB (High Voltage Traction Battery) service disconnect plug

- Battery Energy Control Module (BECM)

- High-voltage Bussed Electrical Center (BEC)

- HVTB (High Voltage Traction Battery) connector and bracket (mounted to the high-voltage BEC (Bussed Electrical Center))

- Battery Pack Sensor Module (BPSM)

- High-voltage low-current fuse (mounted in the high-voltage BEC (Bussed Electrical Center))

- HVTB (High Voltage Traction Battery) system wire harness

- HVTB (High Voltage Traction Battery) cooling fan and jumper harness (accessed from the trunk area)

- HVTB (High Voltage Traction Battery) cooling inlet duct

- HVTB (High Voltage Traction Battery) cooling outlet duct (accessed from the trunk area)

- HVTB (High Voltage Traction Battery) inlet air temperature sensor

- HVTB (High Voltage Traction Battery) cooling inlet duct plate

- HVTB (High Voltage Traction Battery) ground strap

- High-voltage BEC (Bussed Electrical Center) cover

All of the HVTB (High Voltage Traction Battery) assembly components listed above can be individually serviced except the HVTB (High Voltage Traction Battery) and the HVTB (High Voltage Traction Battery) system wire harness. The HVTB (High Voltage Traction Battery) and HVTB (High Voltage Traction Battery) system wire harness are serviced as part of the entire HVTB (High Voltage Traction Battery) assembly which includes all of the components in the list above except the HVTB (High Voltage Traction Battery) cooling inlet duct plate.

The high-voltage system also includes of the following components:

- High-voltage cable assembly

- eCVT (Electronically Controlled Continuously Variable Transmission) , including motor generators and regenerative braking. For information on the eCVT (Electronically Controlled Continuously Variable Transmission) , refer to Automatic Transmission/Transaxle &/or Transmission Control Systems and Computers and Control Systems Information.

- DC to DC Converter Control Module (DC/DC) located on the RH frame rail, behind the radiator support. For information on the DC/DC (DC to DC Converter Control Module) , refer to Hybrid Drive Systems.

- Air Conditioning Compressor Module (ACCM) and A/C compressor assembly located on lower LH side of the engine block. For information on the ACCM (Air Conditioning Compressor Module) and A/C compressor assembly, refer to Heating and Air Conditioning.