Yesterday, at 1934 hours, an electric bicycle that had just been pushed through an elevator exploded in a small area of the city's land of twilight, injuring five people, including four adults and one baby。
The surveillance video from the scene of the incident was alarming and once again sounded a security alarm. In shanghai alone, between last year and april, 546 electric bicycle fires occurred, resulting in 20 deaths and 19 injuries. Most of the fires were caused by irregular charging and short circuits。
The shanghai city non-motorized vehicle safety management regulations, which came into effect on 1 may this year, clearly prohibit electric bicycles from parking and charging areas on the first floor of the building, common entrances, stairwells, buildings, etc., as well as evacuation routes, safe exits, fire vehicle passages and areas on both sides that affect traffic, indoor areas at densely populated sites。
Are citizens aware of the safety of electric bicycle charging? Has there been any improvement in the phenomenon of mischarging in the context of the promotion of the recharging facility? If you see a bottle car in the elevator, will you stop it? Emancipation daily, a journalist, interviewed some of the cyclists in the streets。
Cyclists: there has been a decrease in the number of charges and an increase in the number of centralized charging facilities
"wow, that's scary." when i saw a video of a fire in the chengdu elevator bottle, ms. Wu was shocked, "how much danger can happen in just a few seconds?"
Is there any such danger in the neighborhood? "it's not very worrying." ms. Wu told journalists that she lived in a small section of the iris district, where the underground garage was early equipped with chargers, which provided the electric bottling vehicle with a centralized charge and parking space, and that property managers were regularly replacing the chargers. As a result, the failure to comply with the discharge has naturally decreased。
Since the official implementation of the shanghai regulations for the safety of non-motorized vehicles on 1 may this year, many citizens have shared ms. Wu's experience of the new weather. Recently, citizen lee has been used to parking the electric bottler car in the parking lot. According to his observations, “there has been a reduction in the charge of pushing cars into the building”。
The shinda building near the temple is an old-fashioned district. Despite the small size of the open area, the small area has opened a garage by the side of a well-earned building. Walking into the shed, dozens of electric bottling vehicles were parked on both sides of the aisle, some charging. Each of the spaces has a corresponding inlet, full of firefighting equipment such as fire extinguishers and embolisms。
The shinda building security officer recalled that, since the holding of this electric bottled car, “everyone has consciously parked it in the garage”. In the past, he had not been able to do so well for every woman who had been in need of advice. The release of parking spaces and the installation of chargers, together with the recent implementation of the regulations, is creating a sense of security for the population and is fundamentally reducing the impact of electric bottling and charging in the region。
The regulations have been in force for 10 days and are gradually gaining ground. When asked about “the most stringent non-motorized vehicle regulations in history”, many citizens are free to answer. In their view, the absence of parking charges in areas such as buildings, evacuation corridors and safe exits is a rule that should be observed by everyone。
“these two years have seen too many dangerous accidents, and there has been an intellectual alert.” chen said to the journalists that the stationmasters would emphasize the need to pay attention to the safety of chargers on a daily basis and that the cyclists' awareness of safety had indeed increased, “the safe use of cars is everyone's responsibility and a requirement for their own responsibility”
Fire-fighting experiments: 4 minutes of fire in the electric bottle car, with indoor temperatures of 610 degrees celsius degrees
How powerful is an electric bicycle fire? Previously, journalists had followed up on an electric bicycle fire experiment conducted by the fire department in kinsan, where they had witnessed the enormous damage caused by the electric bottle truck fire。
The experiment was carried out in an abandoned farm on one floor. Furniture such as cabinets, sheets, etc. Were placed inside the house, and three mice were placed near the corner of the ceiling to simulate people in the fire. Close to the gate, two common old electric vehicles containing approximately 15 pounds of plastic。
At the time of the experiment, firefighters took out the cylinders of one of the electric vehicles, simulated short circuits for humans, and monitored personnel recorded changes in temperature and carbon monoxide concentrations at the site。
"back," short circuits, flashes of sparks, gray smoke rises, and the fire is not large
The fire increased rapidly in about one minute, followed by a massive explosion from the electric vehicle, the entire vehicle had been completely burned and hit another electric vehicle parked on the side
In about two minutes, the plastic case of the electric vehicle gradually began to melt
In the approaching four minutes, the flaming fire of the bears was set on fire, with large quantities of black smoke coming out of the window。
On-site real-time surveillance data show that 30 seconds after electric vehicles burn, indoor temperatures reach 134°c and the carbon monoxide concentration from electric vehicles is 9 ppm; up to 100 seconds after combustion, indoor temperatures reach 320°c and carbon monoxide concentrations exceed 100 ppm, exceeding the detection instrument limit; and after 240 seconds, indoor temperatures reach 610°c and the on-site flue gas temperature is close to 300°c。
Five minutes after the short-circuit fire of the electric bottle, the fire continued to expand and firefighters stopped the experiment. After the fire had been extinguished, two electric bottled vehicles had been burned with metal frames, articles such as cabinet sheets had been burned, three mice had not been spared and even cages had been burned. Since then, the open fire has been extinguished by high-pressure water guns, but the temperature of the ceiling inside the house still exceeds 200 degrees celsius。
The experiment also found that the burning of electric vehicles was not only violent but also produced large amounts of toxic gases, especially carbon monoxide. " when carbon monoxide concentrations in air exceed 600 ppm, it causes asphyxiation in a short period of time.”
“as can be seen from the experiment, within two minutes of the creation of the open fire, a large number of toxic and harmful gases have quickly filled the house and are constantly passing out. If an electric vehicle fires in a charge on the building, the flue gas will rise along the building, in which case, if there is no attention to escape methods, it will be dangerous to inhal high temperature toxic fumes as it escapes through the stairs.” according to industry sources, the temperature limit for humans is 60 degrees in the fireplace, and high-temperature toxic smoke is more lethal than open fire if no reasonable escape is taken。
It is worth noting that, apart from the skeletons of the electric bottling vehicle, most of the remaining parts are made of plastic, rubber and polyurethane materials, including chemicals in batteries, which generate large amounts of toxic gases such as hydrogen sulphide and carbon monoxide during combustion. The electric bottling vehicle parked in the building was on fire, and was also highly flammable with miscellaneous items and electric watch boxes, etc., added to the situation。
Perpetrator: battery quality is not off, leading to multiple fires
Statistics previously published by the shanghai fire department indicate that of the 381 electric bottling fires in the city in the first 11 months of last year, 34. 7 per cent were caused by single battery failure, 21. 8 per cent by battery overcharging, 8. 9 per cent by short circuits, 3. 8 per cent by spontaneous combustion, 2. 9 per cent by exposure and 27. 5 per cent by other causes. The battery quality of the electric bottling is not closed and is the main cause of fire accidents。
The industry has told journalists that some batteries may swell when overcharged, but that short circuits and other malfunctions are difficult to judge from the looks of batteries, “can explode at any time as if it were a time bomb”. Therefore, the prohibition of electric bottling into elevators, buildings and densely populated places is an important management tool to ensure the safety of life and property。
“the irregular modification of the electric bottling vehicle is also an important cause of the increase in fire.” industry sources point out that privately modified, battery-filled electric bottling vehicles undermine the safety of the entire circuit and are more likely to cause faults such as overloading or short circuits, followed by fires。
Interviews with journalists revealed that a number of out-of-pocket, couriers have increased the speed of the electric bottling, extended the duration of the cruise, irregular modifications or additions to large-capacity batteries, high-power electric appliances, irregular bundles of batteries, the use of non-matched chargers and, in some cases, flammable decorative materials. According to estimates from the relevant departments, approximately 70 per cent of couriers charge electricity at their place of residence. “this brings with it a high risk of fire as well as a situation in which couriers and couriers become the main affected group in fire casualties.”
In addition, some residents who are unable to use electric bottlings are equally at risk of vehicle fire by choosing informal and non-professional providers or self-maintenance for the sake of greed。
Elimination of hazards: construction of centralized charging sites in shanghai
On 28 april this year, ms. Wang's electric bicycle, whose house was charged in the living room, exploded and burned, and a few seconds later, smoke filled the house, blocking the door with the open fire. Five members of the family were trapped in the house and the man was forced to hide outside the window on the seventh floor. Fortunately, the firefighter arrived in time for the family to be saved, “just a few minutes later, probably dead”。
How can we keep the electric bottle truck charged? This year, shanghai incorporated “new electric bicycle charging facilities for 500 residential neighbourhoods; additional fire-fighting facilities for 1,000 existing electric bicycle charging sites in old sub-regions” into the “practice for the people” project, comprehensively regulating the model of single parking, single charging and integrated management of electric bottling。
In the streets of shanghai and in parts of the community, a group of electric bottling cars have been smart enough to switch cabinets and charge cabinets to provide new ideas for the centralization of electric bottling. “some sub-districts are heavily regulated and residents are not allowed to bring electric bottles into the house for charging. There are also users who are more aware of the safety and fear of an accident at home to charge.” a brand of smart-charger operator staff introduced the charger to meet the needs of this segment of the population. “the average time spent in the cabinet is about 10 hours for each battery, which is charged at night after working hours and removed before working during the day after the following day.”
These smart recharge cabinets have over a dozen features such as high temperature alerts, overload protection, leak protection, automatic fire suppression, etc., which are effective in ensuring the safe charge of bottles. “these charge cabinets have been connected to public security, fire safety networks, integrated community management platforms, etc., to achieve intellectual and visualization of the safe management of battery chargers.” in some old districts that do not have centralized spot recharging, industry has indicated that smart charge cabinets, as an effective complement to the centralized charge management of the vehicle, have further reduced fire hazards and disaster losses through “car power separation”。
In recent years, the shanghai fire service and the public security department have been carrying out a continuous campaign to address the security risks associated with electric bottling, and have been strengthening the controls at the source of the vehicles ' production, sale and modification. At the same time, each fire is traced back to its source and is punishable by law, in accordance with the law, and criminal liability is imposed for the commission of the offence。
