Battery Cell Monitoring, Basic Function - GF54.10-P-1019A
Model all (CAR)
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 aim here is to keep any risk to the safety of the vehicle occupants an, where applicable, the immediate surroundings to an absolute minimum in the event of a battery thermal event.
An appropriate timely warning shown on 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,
- Vehicle status "Charging" or
- battery management system in wake-up condition
Function
Detection of a battery thermal event
On high-voltage battery systems, the battery management system control unit monitors the cell voltage and the insulation value of the lithium-ion battery via 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
For a warning stage 2 battery thermal event, a warning message request is sent to the instrument cluster over the CAN for energy management.
A warning message then appears in the driver's 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 locked vehicle from inside
- Unlocking of charging cable
- Cancellation of driving assistance functions (automated parking, conditionally automated driving)
| Function schematics | |||
| Function schematic of battery cell monitoring | PE54.10-P-2519-97A | ||
| Additional basic functions | |||
| Evaluate battery charge level, basic function | GF54.10-P-1000A | ||
| Stationary battery charging, basic function | GF54.10-P-1006A | ||
| Parking, basic function | Model all (CAR) with code 235 (Active Parking Assist) Except code 8B8 |
GF54.65-P-1002A | |
| Power window assembly, basic function | GF67.39-P-9900A | ||
| Open/close sliding sunroof, basic function | Model all (CAR) with code 413 (Panoramic sliding sunroof/glass roof) Model all (CAR) with code 414 (Electric sunroof, glass version |
GF77.20-P-9901A | |
| Central locking system, basic function | GF80.20-P-9900A | ||
| Air-recirculation mode, basic function | GF83.40-P-1002A | ||
| Battery management system control unit basic function | All models (cars) with xEV charging socket | GF47.70-P-9895A | |
| High-voltage battery, basic function | All models (cars) with xEV charging socket | GF47.70-P-2000A | |
| Battery sensor, basic function | GF54.10-P-2009A | ||
| On-board electrical system battery, basic function | GF54.10-P-2011A | ||
| 48 V on-board electrical system battery, basic function | Model all (CAR) with code B01 (48V technology) |
GF54.10-P-2016A | |