From：CTECHI GROUP Limited Release time：2019-01-14
Overview：Due to the use of lithium batteries in electric vehicles, there is a risk of fire itself. Battery fire incidents are also frequently reported. Electric vehicle owners are increasing rapidly with the growth of sales of new energy vehicles. Every electric vehicle driver should have a scientific awareness to deal with battery fire. The following four stages of lithium battery fire are shared with you in combination with internal training.
Due to the use of lithium batteries in electric vehicles, there is a risk of fire itself. Battery fire incidents are also frequently reported. Electric vehicle owners are increasing rapidly with the growth of sales of new energy vehicles. Every electric vehicle driver should have a scientific awareness to deal with battery fire. The following four stages of lithium battery fire are shared with you in combination with internal training.
Lithium batteries will heat up before ignition. Most battery managers of electric vehicles have the function of temperature detection and alarm. There is a fault light on the instrument of electric vehicles to warn the overheating of batteries. Different brands of electric vehicles have different high-temperature fault lights, but basically the background is a battery symbol, plus a warning symbol. If you find this kind of fault lamp on the instrument, you must go to the automobile repair shop as soon as possible.
Battery overheating is more likely to occur in fast charging and high temperature in summer. High temperature will trigger the battery management protection mechanism and cut off the whole vehicle's high voltage. If you often have an inexplicable power failure in your electric car, you must pay attention to whether the overheating of the battery results. Battery heating is an important signal before power battery accidents. We must pay enough attention to it. Early detection and early treatment can avoid personal injury and economic loss.
When the short circuit inside the lithium battery is uncontrollable, the electrolyte is heated and gasified and decomposed. Ultimately, the pressure is too high to cause the battery shell to break down. High-pressure gas ejects from the shell breakdown. The gas quickly diffuses to the weak part of the battery bag, and smoke can be seen in the car and chassis.
If unknown smoke is found inside the electric vehicle, it should stop immediately and leave quickly. Generally, lithium batteries only have tens of seconds from smoke release to fire. The electrolyte vapor and acid gas contained in the smoke are harmful to human body. A small amount of inhalation will stimulate the respiratory mucosa, and a large amount of inhalation will lead to poisoning. Therefore, in the discovery of smoke from electric vehicles, we must quickly stay away from the accident site and wait for professional fire fighting forces to deal with it.
When the car or chassis starts to erupt open fire, it shows that the power battery of electric vehicle has completely lost control, the failure of the battery has spread the fire potential to other normal units, has started to ignite other batteries around, resulting in more and more fierce fire, high temperature quickly destroys the normal battery, the flammable materials in the battery fiercely burns and sprays flame outward.
In the case of open fire in batteries, personal or professional fire control has been unable to control the situation. Because the fire source is inside the battery pack, there is almost no way to control the fire. The fire department's usual practice for electric vehicles to fire is to let them burn, while establishing an isolation zone to prevent the fire spread to the surrounding environment and vehicles. Therefore, if you are unfortunately caught in an electric car fire, don't fantasize about any way to remedy it.
Explosion is a form of intense combustion. The explosion is caused by the instantaneous explosion of expanded lithium batteries. The energy generated by explosion will explode other expanded lithium batteries, which will lead to the explosion becoming more and more intense and pose a threat to the surrounding vehicles and personnel. Once the battery of the electric vehicle explodes, it means that the electric vehicle is completely scrapped.
Battery explosion is the most serious extreme accident of electric vehicles. Objectively speaking, there are more battery explosion accidents in electric vehicles on the market than we can see from the news. If we are unfortunate to encounter similar accidents, what we need to do is to stay away from the scene of the accident. Any other operation is useless and will increase the risk in vain.
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