Battery Cell Monitoring, Basic Function - GF54.10-D-1019A

Model All (Light transporter) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 
  • Detection of a battery thermal event 
  • Request for warning message in instrument cluster/driver display. 
  • Additional support measures and functions 

The notification via Mercedes me follows at a later stage.

General 

The system can detect irreversible cell overheating in a lithium-ion battery while driving or during an active charging process. The objective here is to keep any risk to the safety of the vehicle occupants and, where applicable, the immediate surroundings to an absolute minimum in the event of a battery thermal event.

An appropriate warning message shown promptly in the instrument cluster enables the vehicle to be brought to a safe standstill whereupon all the vehicle occupants can then exit the vehicle.

Additional supporting measures and functions (e.g. closing of air recirculation flap, closing of windows and sunroof) can be automatically actuated.

Function requirements 

• Drivetrain operational
• "Charging" vehicle status
• Battery management system in wake-up condition

Function 

Detection of a battery thermal event 

In the case of HV battery systems, the battery management system control unit monitors the cell voltage and insulation value of the lithium-ion battery using the battery sensor system.

If the cell voltage and the insulation value drop below a certain value, the system detects a battery thermal event.

Request for warning message in instrument cluster/driver display 

In the event of a battery thermal event of warning stage 2, a request for a warning message is sent to the instrument cluster from the hybrid CAN (CAN L).

A warning message then appears in the driver display of the instrument cluster.

Additional support measures and functions 

Depending on the warning level, further measures and functions can be actuated to match the model or equipment installed:

• Closing of air recirculation flaps
• Closing of side windows and sliding sunroof
• Unlocking of vehicle locked from inside
• Unlocking of charging cable

	Function schematics
	Monitoring of battery cells, function schematic	Model 907 with code M1E (Electric vehicle)	PE54.10-D-2519-97A
	Additional basic functions
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