(Battery Management System Control Unit Basic Function - GF47.70-S-9895A)

Model All (Light transporter) 

Electric vehicles 

Courtesy of MERCEDES-BENZ USA

Example illustration 

Overview 

For vehicles with several high-voltage batteries, the descriptions listed here apply per battery.

This document contains information on:

• General 
• Function 

General 

The high-voltage battery module is an electrochemical energy storage unit located in the high-voltage on-board electrical system that ensures the electrical supply of the high-voltage and 12 V on-board electrical system. The electrical supply of the 12 V on-board electrical system occurs via a DC/DC converter.

The battery management system control unit is integrated in the high-voltage battery module on vehicles with a high-voltage battery module. In vehicles with several high-voltage battery modules, it is designed as a separate unit.

Function 

The battery management system control unit is connected to the network architecture of the vehicle.

The battery management system control unit determines and constantly monitors the following data:

• Interlock circuit
• High-voltage battery voltage
• High-voltage battery current flow
• Temperature of high-voltage battery
• State of contactor
• High-voltage on-board electrical system insulation monitoring status

For this purpose, the battery management system control unit processes the following input factors among other things:

• Circuit status
• Interlock circuit
• Crash signal
• 12 V on-board electrical system battery voltage/current
• Outside temperature
• Vehicle speed
• Deep discharge protection status
• High-voltage charging voltage/charge current
• Status of charger
• Charging cable connector status

The battery management system control unit processes these input variables and transmits the following information among other things:

• High-voltage battery voltage/current
• High-voltage battery cell voltage
• High-voltage battery charge level
• Temperature of high-voltage battery
• Max. charge/discharge current
• Internal resistance during charging/discharging of high-voltage battery
• Status of the contactor
• Detection of a thermal event
• Fault messages