Why can't lithium batteries enter elevator halls? Because the ternary lithium battery used in the old national standard can be taken down and taken home for charging. Now many people live in the urban community, up and down the stairs to use the elevator, if the ternary lithium battery into the elevator room, due to the elevator car perennial up and down friction will produce a magnetic field, and the ternary lithium battery has a large number of positive and negative charges, at this time cutting the magnetic inductance line may penetrate the internal structure of the battery, the positive and negative electrodes are short-circuited, resulting in the ternary lithium battery thermal runaway and finally deflagration fire.
The battery is a thermal runaway in the early stage of the fire, and the fire cannot be extinguished by using sand, water, and ordinary fire extinguishing agents in a violent reaction. Lithium batteries in the narrow elevator car thermal runaway, the fire burns violently to produce hundreds of degrees of high temperature, combustion produces toxic and harmful smoke and gas. The fire will burn the combustibles in the elevator car, including the clothes on the person, and the toxic and harmful gases may suffocate and faint if inhaled 3~5 mouths, and will die of suffocation if not treated in time. Therefore, lithium batteries cannot be brought into the elevator room.
Electric vehicles are not allowed to be parked and charged indoors at home, and why is that?
The batteries used in electric vehicles include lead-acid batteries and lithium batteries, and if it is a lead-acid battery, it is not a big problem for electric vehicles to take home for charging, because the performance of battery raw materials is stable, and overcharge and overdischarge will not deflagrate and catch fire. If the electric vehicle uses a ternary lithium battery, the battery charging time is too long or the circuit is changed without permission, and the over-discharge of the battery may cause the internal lithium branch crystals to penetrate the separator and cause a short circuit. Then, once the lithium battery detonates in the closed environment of the home, the fire will burn everything in the room.
If someone in the home burns the toxic and harmful gases produced by the fire, it will suffocate the people present, if it is not treated in time, it will die of lack of oxygen, and if the fire is not controlled, it will spread to the upper floors. The insulation of the building's exterior wall is combustible, and the fire spreads to the upper floors with the help of the wind, causing a bigger fire accident, like the fire in Nanjing in February this year.
The preliminary judgment was that the cause was a fire ignited by an electric bicycle parked on an overhead floor, which burned from the 6th floor to the 18th floor, killing 15 people and injuring 44 others. So, for the sake of safety, try not to take electric vehicles home to park and charge indoors. Because lithium is a reactive metal, overcharging and over-discharging can cause a fire without warning, and the fire is uncontrolled.
Summary:
If the lithium battery is brought into the elevator room, the magnetic field generated by the friction up and down the elevator is likely to break through the internal structure of the battery and cause a short circuit in the positive and negative electrodes, which will lead to the thermal runaway deflagration of the battery. Due to the small space of the elevator car, high temperatures accompanied by thick smoke may cause casualties in the car. If you take the electric car home and park it indoors for charging, the lead-acid battery electric vehicle is safer, if the lithium battery ignites once the fire is ignited, the fire is not controlled, it will cause greater casualties and property losses.
The safety of lithium batteries should attract our sufficient attention, if your electric vehicle is installed with lithium batteries, please read the lithium battery instruction manual carefully and operate it correctly. Electric vehicles should be parked in a relatively safe carport in the community and charged there, so as to avoid personal injuries and property losses caused by the ignition of lithium batteries. In addition, in order to reduce the risk of battery ignition, it is recommended that you try to choose a lead-acid battery with higher safety when buying an electric vehicle.