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Safety alarm ringing power battery safety is not equal to new energy vehicle safety

Safety alarm ringing power battery safety is not equal to new energy vehicle safety

Release time:
2019/09/06 12:28
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A new energy car fire accident shocking!112
It is urgent to strengthen the fire safety education of electric vehicles.
It is urgent to study the fire prevention and control technology of electric vehicles.
The safety alarm has sounded!
Without safety, there will be no future for new energy vehicles!
 
New energy vehicles caught fire and were not easy to extinguish. According to incomplete statistics, from May to August this year, 79 spontaneous combustion accidents of new energy vehicles occurred in the whole country, which aroused users'great concern about the safety of new energy vehicles.
 
 
On September 2, Ningbo Fire Rescue Branch and Geely Automobile Research Institute launched a fire experiment of new energy vehicle thermal runaway and a fire fighting drill of new energy vehicle. It may be useful to look at a large set of data after a new energy car fire.
 
Experiment
 
Experiment 1: When the heat runs out of control, the people in the car have enough time to escape.
 
In the open outdoor experimental site, reporters saw two traditional fuel vehicles and one new energy test vehicle parked in three standard parking spaces. A data acquisition area is set up at 15 meters away from the test vehicle, which is separated from the test area by solid wall. The information of thermal runaway time of battery pack, smoke occurrence time, open fire occurrence time, smoke entering cab time and flame entering cab time are collected respectively.
 
At 9:00 a.m., the experiment officially began. By simulating the thermal runaway of batteries in new energy vehicles, the process of battery pack ignition and the trend of fire spread were recorded, and the impact on vehicles near parking spaces and the overall trend of flame spread were analyzed.
 
The heater triggers the thermal runaway of the batteries of the intermediate new energy test vehicle, starts the core heating at 9:9:52 seconds, and smokes at 9:19:33 seconds for the first time (the national standard requires more than five minutes, the experiment shows that it has reached nearly 10 minutes). The first core thermal runaway has two temperature detectors over 1000 degrees Celsius, that is, the first and second temperature. The failure of the Degree Detector triggered the thermal runaway of the first core with a carbon monoxide value of 10,000 ppm. The second smoke occurred at 10:12:15 seconds, and the third temperature detector failed after exceeding the limit range of 1300 degrees Celsius, triggering the second core thermal runaway. At this time, the carbon monoxide value was significantly lower than the first trigger point. There is very little smoke in the car. From the experimental results, in the case of thermal runaway, drivers and passengers still have enough time to escape.
 
Experiment 2: Fire extinguishing position is very important after new energy vehicle is on fire.
 
External fire ignited vehicles, photographed and recorded the trend of flame spread, analyzed the impact of the battery by the flame and the surrounding vehicles. Real-time monitoring of the vehicle combustion process after the fire, observing the time of flame and smoke entering the cab, and recording the temperature changes and the concentration changes of toxic gases (CO) in various parts of the vehicle combustion process.
 
At 13:40, the experiment began. At 13:44:30, smoke entered the cabin. At 1401:29 seconds, the rear camera of the vehicle showed that the fire entered the passenger compartment. In the experiment, the time from ignition of the fire basin to thermal runaway of the battery was 40 minutes. The detectors were burned out. A large amount of smoke entered the hole cab burned by the fire from the rear of the vehicle, and then a large number of flames spread to the cockpit. The flames expanded and the whole vehicle burned. The heavy rain on the spot did not stop, but it did not affect the fire. The sound of explosion could be heard constantly. The pungent smoke was diffuse. The first one appeared was the left rear wheel. Then the right rear wheel and the right experimental vehicle were ignited and ignited.
 
According to the burning characteristics of new energy vehicles, fire fighters refer to field rescue. A firefighter wearing an insulated suit holds a detector to detect the temperature and leakage of electricity at all times. Four firefighters cool down through four-point water guns. Two firefighters insert the bottom sprinkler from the front of the vehicle to carry out the bottom by using the self-developed bottom sprinkler of the brigade. Other firefighters use vehicle shifters to remove adjacent vehicles and expand the rescue space. Two firefighters insert bottom sprinklers from left and right sides respectively. The fire situation is quickly controlled.
[Expert Interpretation]
 
After discovering the unexplained smoke of the new energy vehicle, it is necessary to pull over quickly, turn off the power, get off the vehicle and dial the rescue telephone. Keep in mind that you should never start or enter the vehicle until you have identified the source of the smoke.
 
If the batteries of new energy vehicles are on fire, they must stop immediately and get off and stay away. At this time, it is no longer important to extinguish the fire, because the battery may explode in a larger fire situation. It is necessary to keep a safe distance and dial the fire alarm telephone.
 
[Special reminder]
 
Four objectives have been achieved through this experiment and drill:
 
One is to improve the level of fire prevention of new energy vehicles, improve the safety performance of new energy vehicles'batteries, master the time of smoke ignition of batteries, and save enough time for passengers to escape.
 
Secondly, the fire rescue capability should be improved, and research should be carried out on the problems of breaking down and rescuing people, choosing the right jet and the best jet water level, and effectively and accurately extinguishing fire in the case of power failure of new energy vehicles.
 
Thirdly, it evaluates the fire hazards of new energy vehicles, and understands the differences between new energy vehicles and traditional fuel vehicles through experiments, especially the analysis of heat, toxic gases and high voltage electricity generated during combustion, so as to guide drivers to escape and fire fighters to fire fighting and rescue.
 
Fourthly, the traces produced under different conditions, such as short circuit, overload and collision, are analyzed and studied to enhance the practical ability of fire investigators.