Residential buildings are high-risk places for electric bicycle fires. According to the "Regulations on Fire Safety Management of High-rise Civil Buildings" issued and implemented by the Emergency Management Department in 2021, parking or charging of electric bicycles is prohibited in public halls, evacuation walkways, stairwells, safety exits and other places of high-rise buildings. Then why do car owners insist on "pushing cars into the house"? Why do you need to charge at home?
Not long ago, reporters also visited all parts of the country and found that it is still common for residents to bring electric bicycles or batteries into indoor charging illegally. The reporter learned that the lack of public charging facilities is the main pain point encountered by residents when using cars.
Insufficient public charging facilities are the main pain points.
In an old residential area in Tianjin, the reporter saw that it is more common for residents to put electric bicycles in the corridor at will or push them into the elevator. Although some residents parked their cars outside the building, they still took the batteries home to charge them for convenience.
In a community in Fengtai District, Beijing, the reporter saw that although public charging facilities for convenience have been set up next to residential buildings, and electric bicycles are reminded with eye-catching slogans that "do not enter the building and do not enter the house", some residents still turn a blind eye to this.
In a community in Dongsha Street, Liwan District, Guangzhou, some residents still push their electric bicycles into their homes to charge, knowing the risks.
In the street park of the nearby community, although a public charging area with more than ten charging ports is also provided, when the reporter visited, he did not see an electric bicycle charging here. In addition to spending more money, residents say that they sometimes want to use it, and they can’t find a vacancy. Even some non-rechargeable vehicles often stop in the shed to occupy a position.
Problems such as potential safety hazards reflected by residents and insufficient public charging facilities. The staff of the local community neighborhood Committee said that they would try their best to persuade illegal charging behavior during daily inspections. As for the expansion of public charging facilities, in addition to security factors such as anti-theft and fire prevention, it is also faced with problems such as limited space in old communities and the inability to distance itself from residential buildings. At present, it is difficult to advance.
Car owners do not pay attention to the safety of electric bicycles.
The reporter learned that in addition to the many car pain points mentioned in the above film, there is another aspect, that is, many car owners lack sufficient attention to the safety of electric bicycle batteries and insufficient understanding of battery quality. According to the statistical analysis of the National Fire and Rescue Bureau, the main causes of electric bicycle fire include battery overcharge, battery monomer failure, short circuit of electrical circuit and so on. It can be seen that battery quality is particularly critical. In particular, old batteries and modified batteries that have been used for a long time have no small safety hazards. Therefore, battery inspectors have also done relevant tests.
In order to test the difference of charging safety factor between an old battery and a new battery, inspectors first disassembled a common lithium battery for electric vehicles, and it can be seen that the battery is actually composed of 10 battery cells. Subsequently, the inspectors put two new batteries that have been disassembled separately and the old batteries that have been used for a long time into the experimental box at the same time, and carried out charging tests at a fixed temperature and under the same conditions.
Li Zhaoyang, Senior Engineer of Battery TestingThis orange curve is the temperature change of aging battery, and the blue curve is the temperature change of new battery. It can be seen that the temperature of aging battery rises faster than that of fresh battery when charging, which is 1℃~2℃ higher on average.
The inspectors also simulated the collision that may be encountered in the daily use of the battery and conducted a pressure test. It can be seen that the squeezed battery first appears obvious internal cracking sound, and then suddenly bursts. Then there was smoke coming out of the battery, and then it exploded and caught fire.
Huang Huanjie, Executive President of Guangzhou Electric Bicycle Industry AssociationWe also participated in the investigation of some fire cases, and found that the main problems were some small brand batteries, or some batteries with "three noes" products, which were refurbished and reassembled from old batteries.
Industry insiders remind that battery overcharge may lead to battery performance degradation, shorten battery life and even damage the battery, leaving hidden dangers. In addition to developing good habits, car owners must choose regular manufacturers when buying batteries for electric bicycles. Even if it is a new battery, it should be inspected or replaced within six months to two years.
Fire caused by electric bicycle entering the house.
In the face of the fire caused by electric bicycles, many netizens left messages on the Internet expressing concern. Poke the video and see what the netizens say.
All localities actively explore the experience and practice of combining "dredging" and "blocking"
According to the data of China Bicycle Association, by the end of 2022, the number of two-wheeled electric bicycles in China has reached 350 million, which is equivalent to one electric bicycle for every four people. With the popularity of electric bicycles and frequent accidents, it also puts forward new challenges and requirements for the original order and management of the city.
Experts said that in addition to improving the regulations and standards for electric bicycle parking and charging in relevant places from the legislative level, the relevant departments should actively explore the experience and practice of combining "sparse" and "blocking".
In Suzhou, the local government, functional departments and social subjects’ legal responsibilities have been defined for the production, sales, parking, charging and management of electric bicycles. At the same time, the civil air defense measures should be improved in conditional communities, with 24-hour remote video monitoring devices and independent smoke fire detectors.
Shen Qiuning, a community workerWe have also purchased "three defenses" insurance for residents. The so-called three defenses are fire prevention, theft prevention and loss prevention. If our vehicle is stolen in the process of using the charging facilities, or there are losses for other reasons, we can give a subsidy of up to 2000 yuan per vehicle when taking insurance.
In Fengtai District, Beijing, the local fire department is actively promoting the streets and property units under its jurisdiction to install intelligent ladder control systems in this community. With the help of the intelligent camera installed in the elevator box, the system accurately controls the electric bicycle and battery to "go upstairs by ladder" by means of "algorithm identification+sound and light alarm".
In terms of promoting the construction of electric bicycle charging facilities, Beijing also plans to build another 200,000 public charging interfaces in 2024 on the basis of the 950,000 public charging interfaces already built, so as to solve the charging pain of car owners.
