Technical information
thermal response will take place. Monitoring the high-voltage battery with a thermographic camera is therefore
recommended.
Trapped persons can be rescued using suitable fire fighting equipment.
The BMW I01 consists of a carbon fibre passenger cell based on an aluminium drive module. The carbon fibre are not
combustible. However, since these fibres are held together by a special resin, the resin may catch fire in the event of high
temperatures.
Bear in mind that a fire may lead to the vehicle structure losing its original strength. After a fire, the vehicle solely consists
of the structure of the drive module. Observe chapter 3.2.3 during recovery!
.
3.2.1 Extinguishing
In the event of fire, the high-voltage battery is to be cooled with a lot of water in order to prevent further reactions inside
the high-voltage battery. When extinguishing the fire, audible processes can occur inside the high-voltage battery. This
takes place in the safety valves of the battery cells. This process is no source of danger. These audible processes can
also occur after extinguishing the fire.
.
3.2.2 Determine de-energised state at burned down vehicle
There may still be electrical hazard potential after the fire. The insulation of the high-voltage cables can be damaged or
even removed by the heat.
In this case, the vehicle may only be approached when wearing personal protecting equipment.
As described in chapter 3.1.2, point 8, both cables need to be checked for the de-energised state in this case as well. In
the next step, measurements need to be taken between both cables and the housing of the high-voltage battery. Further
cables can be checked in the front part of the vehicle, if necessary. If a voltage potential is still present, the high-voltage
cables coming out of the high-voltage battery need to disconnected from the high-voltage battery. Therefore, the copper
lines are to insulated against each other and to be cut through one by one in order to prevent a short circuit. Afterwards,
a short circuit to ground should be checked.
Note: The high-voltage cables of the high-voltage battery can be identified by their considerably greater cross-section. If
the insulation is melted due to the fire, only the copper lines can be identified.
.
3.2.3 Procedure for fire residues of vehicle
Personal protective equipment must be used when disposing of fire residues.
In case of fire, the high-voltage battery can bond to the roadway due to the high temperature. In this case, no metallic
objects may be used to remove the high-voltage battery from the roadway. Since the carbon fibre structure no longer
provides any strength, the vehicle needs to be lifted directly beneath the high-voltage battery. Lifting via the wheels does
not help. The drive unit would be pulled out. The drive unit (front/rear axle) would disconnect from the life module.
The residues of the vehicle should be removed from the roadway using pointed wedges made of insulating material (for
example wood). Afterwards, the high-voltage battery must be supported using insulating material in order to feed through
the lifting sling. If a forklift truck is available, it can be used to lift the high-voltage battery (with insulating support between
the high-voltage battery and the truck) and the vehicle.
The residues of the vehicle can be lifted onto a truck with insulation on the loading platform and then covered with an
insulating cover. A corresponding high-voltage identification (warning sticker) must be attached.
First recovery of the vehicle with damaged high-voltage battery is secured by law.
.
3.3 Vehicle in and under water
After recovery of the vehicle out of water the high-voltage system is to be switched-off by removing the high-voltage
service disconnect and disconnecting the 12 V battery (negative terminal). In case of airbag deployment, the switch-off of
the high-voltage system can be assumed. Touching high-voltage components and high-voltage cables is to be avoided.
.
3.4 Split or separated high-voltage battery
The voltage within the high-voltage battery cannot in principle be switched off. The high-voltage battery of the BMW I01 is
- Personal protective equipment as per conventional vehicle on fire!
- Electrical danger can also occur after a fire!
- BGI/GUV-I 8677 governing electrical hazards at fires
- Observe the following safety distance when extinguishing
1 m - spray jet
5 m - full jet
After recovery out of water:
- Observe vehicle thoroughly.
- Store vehicle outdoors with sufficient clearance to combustible material!
- Provide access for fire brigade.
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