Circuit/System Description

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

The hybrid/EV battery sections consist of lithium - ion batteries connected in series to make up the 288V DC battery.

Each hybrid battery section contains 10 cells that are connected in series using internal bus bars. The battery sections are externally connected in series using high voltage cables and bus bars. Each individual cell group is rated at 3.6V, for a nominal system voltage of 288V DC.

A voltage sense circuit is attached to each individual cell. Each of these circuits terminate at a Hybrid Battery Interface Control Module located on the top surface of the battery section. The interface modules are connected to each other and the hybrid/EV powertrain control module 2 via serial data.

The hybrid/EV powertrain control module 2 determines the high voltage system/battery voltage level in several ways:

Monitoring the K112 hybrid/EV battery interface control module serial data for sense circuits that terminate at each individual hybrid/EV battery cell group
Summing the individual cell group voltage values to obtain a total hybrid/EV battery pack voltage
Monitoring fused sense circuits that terminate at the high voltage negative and positive battery connections of the A28 hybrid/EV battery contactor assembly
Monitoring the serial data high voltage value observed by the T6 power inverter module

The hybrid/EV powertrain control module 2 may compare these values against each other to verify accuracy.