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Hybrid Car Emergency Procedure

Hybrid Car Accident in Sri Lanka.

Extrication

1) Turn off ignition switch and remove key (if so equipped). This turns off the engine and the motor, which prevents electric current from flowing into the cables from the motor or high-voltage battery, and, turns off power to the airbags and the seatbelt pre-tensioner.

2) After turning off the ignition switch, it is recommended that emergency responders remove the key (if so equipped) so the car cannot be inadvertently restarted. To let everyone at the crash scene know the key is removed, give the key to the I/C, who will make a general announcement regarding the key. At this point, the high-voltage system has been isolated. This improves responder safety in and around the vehicle.

3) The next step is to shut down the 12V electrical system on the hybrid just as we typically do on any conventional vehicle involve din an MVA.

4) Locate the 12V battery. It may or may not be under the hood. In the Toyota Prius it is located inside the driver’s rear wheel well within the trunk. Either disconnect or double cut first the negative and then the positive cable. This disables the high-voltage battery controller, which prevents electric current from flowing into the orange cables and the high-voltage battery.

5) With the ignition key turned off and removed and the 12V battery disabled, the hybrid vehicle is safe to work on for vehicle rescue. High-voltage electricity still exists, but it is isolated to the battery pack, generally in the trunk of cars or under the rear passenger seat in pick-ups.

6) An alternative to disabling the 12V battery is to remove the HEV fuse, generally located in the engine compartment junction box. When in doubt pull all fuses in this box.

7) Stabilize the vehicle. Crib at four points directly under the front and rear pillars. Do not place cribbing under high-voltage power cables, exhaust system or fuel system.

8) At this point conventional rescue techniques may be used, including cutting of door hinges, modified dash roll, steering wheel displacement, etc. However caution must be used at all times to avoid cutting any high or intermediate-voltage lines.

9) Should a hybrid be involved in a rollover, end up on its roof, this may prevent access to the engine compartment and disabling of the 12V battery may not be possible. This poses a serious threat. If access to the 12V battery is not hindered, extrication can be handled as in any conventional vehicle rollover.

10) The removal of the roof of hybrids such as the Toyota Prius may be easily accomplished by opening the hatch to gain access for cutting of the pillars. The hatch will need to be opened manually with pry tools because 12V power is needed to open the hatch.

11) Hybrid identification tags are located in the rear and/or sides of the vehicle. Severe impacts in these areas could destroy or hide the identification tags. You must be sure to look for other hybrid identifications, make sure you are aware of the models on the road, and when in doubt assume the vehicle is a hybrid until proven otherwise.

FIRE

1) A fire involving a hybrid vehicle can be handled by following normal vehicle firefighting procedures. In a typical vehicle fire incident, the engine compartment, interior of vehicle or trunk area are burning. By following generally accepted fire suppression guidelines, crews attack the fire with an adequate water flow rate, working from a safe position of approach.

2) SCBA is worn throughout the incident.

3) The initial fire attack should be a fast and aggressive attack.

4) Fire crews may not be able to identify a hybrid until the fire has been knocked down and overhaul operations have commenced.

5) The wheels should be chocked as soon as safely possible.

6) During overhaul, the same steps defined in the extrication module should be used to disable the high-voltage system. (shut down power, disable 12V system)

7) Fire suppression crews will not be shocked or electrocuted during attack on a hybrid vehicle fire, even if flames are impinging on the battery pack itself.

8) There are potential, unique problems involving fire situations with hybrid vehicles. Any fire where there is direct flame impingement on the high-voltage battery pack would be an example. A fire that has originated within the battery pack itself or an electrical fire that begins somewhere within the high-voltage electrical system would also require special precautions.

9) Radiant heat could cause the modules inside the high-voltage battery to melt just as any plastic material would exposed to high temperatures. If heated sufficiently, it is possible the plastic casings could melt down, exposing the inner components of the high-voltage battery.

10) Copious amounts of water should be used quickly to eliminate radiant heat to the battery box and begin cooling the plastic battery cell modules in the high-voltage battery pack itself.

11) Should a fire in the Ni-MH HV battery pack occur, the I/C will have to decide whether to pursue an offensive or defensive.

12) If a melted nickel metal hydride (Ni-MH) battery is encountered, the I/C may want the nearest dealer of the vehicle notified to send a designated battery recovery specialist to the scene to deal with the damaged battery.

13) In the Ni-MH Product Safety Data Sheet, responders are advised that virtually all fires involving Ni-MH batteries can be controlled with water. The information sheet also recommends “In case of fire where nickel metal batteries are present, apply a smothering agent such as METL-X, sand, dry ground dolomite, soda ash, or flood the area with water. A smothering agent will extinguish burning nickel metal hydride batteries.”

14) Class D extinguishers are the recommended extinguisher to use with Ni-MH batteries. But…….

15) Not all Class D extinguishers are equal. Some contain particles of metal such as copper. Copper, for example, is one metal that may actually cause an adverse reaction with the high-voltage battery and generate hydrogen gas. In a small space, such as a trunk, this could cause an explosion.

16) Large amounts of water will not be able to directly attack a fire burning inside the battery pack unit itself. The metal cover of the pack prevents a direct attack on the internal cells of the battery. The water application, however, will cool the adjacent battery cells. Burning Ni-MH batteries will burn themselves out. Applying sufficient amounts of water will cool the metal housing of the battery pack and control the fire until the battery modules that are actually on fire burn themselves out. DO NOT EVER REMOVE THE COVER OF THE HIGH-VOLTAGE BATTERY PACK!

17) When water is used to extinguish Ni-MH battery fires, some hydrogen gas may evolve. In this situation ventilation will be needed to prevent a build up of the gas. Leaving the trunk, hatchback or battery compartment cover open is advised to ensure ventilation of the gas. If there is a concern that hydrogen gas is present, and ventilation is not possible, fire smothering agents are recommended.

18) A battery fire WILL produce toxic fumes, including oxides of nickel cobalt, aluminum, manganese, lanthanum, cerium, neodymium and praseodymium. Because of this, SCBA must be worn throughout the fire attack and during overhaul.

19) In addition, keep the “hot zone” clear of unnecessary personnel. Keep all “hot zone” personnel fully protected with structural clothing that addresses Level 3 hazmat personal protective clothing criteria and SCBA.

STEPS TO SECRURING HYBRID VEHICLE

1. Chock wheels

2. Remove/Find Key

3. Give key to I/C

4. I/C makes general announcement regarding key

5. Locate power button/Shut off power

6. Engage emergency brake

7. Cut negative 12V cable

8. Cut positive 12V cable

9. Do not touch or cut any orange or blue loom!

10. Wait 5 minutes before making any cuts for extrication!