Volt

Drive Motor Battery System Description

The hybrid battery contains 288 cells. Groups of three cells are welded together in-parallel called cell groups. There are a total of 96 cell groups in the hybrid battery assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cell groups are joined to form 3 distinct sections. The first 30 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 67 through to 96. The next 24 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 43 through to 66. The transverse battery section is section number 3 and it contains the remaining battery cell groups 1 through to 42. The 3 battery sections are individually serviceable components.

The battery energy control module monitors the voltage of the 96 battery cell groups through 4 hybrid battery interface control modules. There is one hybrid battery interface control module for section 1 and 2, with section 3 having two modules. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A serviceable voltage sense harness joins this connector to the hybrid battery interface control modules, located on the top surface of the battery section. The hybrid battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery energy control module harness. The hybrid battery interface control modules 1-4, voltage sense harnesses, generator battery control harness and battery energy control module are all considered serviceable components.

The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

The hybrid battery is located beneath the vehicle. The battery energy control module, hybrid battery interface control modules 1-4, current sensor, and high-voltage contactors are located within the hybrid battery assembly. The hybrid powertrain control module 2 is located under the front passenger seat.