Qianjiang Evening News reported that on April 11, there was a fire in the Hualian Village of Sandun, Xihu District, Hangzhou, causing three deaths. At present, the fire point is initially determined to be in the electric vehicle storage place; on April 22, Wenshan Street in Xiaoshan District The farmhouse in Lingjiawu Natural Village of Hecun caught fire, and five people were killed. The reason is still under investigation. The two fire accidents that occurred in the village in the city caused great concern from the Hangzhou Municipal Party Committee and Municipal Government.
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It is reported that the Hangzhou Municipal Government recently issued the "Emergency Notice on Further Strengthening Work Related to Safety Production Management in Fire Safety in Urban Villages". The notice put forward five specific requirements, in particular, it is necessary to strictly implement the safety measures for parking and charging of electric bicycles. To rent a house, you must establish a centralized parking spot for electric bicycles that meet the fire safety technical precautions or set up an electric bicycle intelligent charging pile. The grassroots patrol force should increase the inspection and inspection of electric bicycles, implement the "two uniforms" (electric bicycles will not be parked in the corridors and other areas, will not charge overnight) and "two mandatory" (for the discovery of illegal parking charges) The requirements for forced removal and forced power off).
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Hangzhou will also carry out a comprehensive investigation of the major safety hazards in the urban villages within the city.
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How much do you know about electric vehicle charging?
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Electric vehicles have become the main means of travel for the public. While bringing convenience to everyone, they also bring hidden traffic safety hazards. At the same time, electric vehicle fires that have occurred in recent years have gradually attracted the attention of the fire department. Electric car fires are mostly when charging. According to the fire professional, once the electric car is on fire, 90 seconds after the fire, the temperature will reach 200 °C, and the fire will develop rapidly. To this end, Xiao Bian specially reminded the general public that electric vehicle charging needs to pay attention to safety precautions.
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1) The electric car is easy to catch fire when charging
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Electric bicycles are prone to fire when charging. The root cause is related to the charging environment of electric bicycles, the habits of the owners and the materials of electric bicycles. The main reason is that the electric vehicles are short-circuited by their own electrical lines, the charger line is overloaded, and the electric vehicle battery is faulty.
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Some electric vehicles produced by some manufacturers also have some defects, such as design current and line and connector mismatch, improper handling of plug-ins and connectors, and irregular wiring. Statistics show that many electric vehicle fire accidents occurred in the city occurred during the charging process and were charged for more than 4 hours.
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Because the electric vehicle has its own heavy weight, it is inconvenient to move up and down, and is not suitable for open storage. Therefore, the user usually moves the electric vehicle to the indoor storage and charging at night, and the storage place is mostly in the first floor hall, walkway or stairwell of the building. , conditionally concentrated in the garage, carport.
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When an electric vehicle is charged indoors in the first floor of the building, in the event of a fire, the flame and smoke will block the safe exit and escape route of the building, which may easily cause casualties or even deaths.
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2) Electric vehicle fire occurs instantaneously at a high temperature of 200 ° C
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An experiment by the fire department found that once the electric car caught fire, the temperature reached 200 °C 90 seconds after the fire, and the fire quickly developed.
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The corridor as an escape route will be blocked by open flames and heavy smoke, which will increase the difficulty for residents to escape safely. The poison gas generated by the burning of an electric car is enough to cause hundreds of people to suffocate and die! When the material of the electric vehicle burns, it will produce highly toxic carbon monoxide and other gases, which will be filled in the building. Secondly, after the high temperature smoke enters the human airway, it will cause severe burns and suffocation.
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Finally, the black smoke generated by the burning of electric vehicles is likely to cause insufficient light in the building, which brings great difficulties for evacuation. It is not uncommon for electric bicycles to be parked in the corridor. Experiments have shown that in the event of a fire, the escape time left to the residents is shorter than you think.
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Electric vehicle charging prevention advice
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1. Pull the plug before going to bed. One night is one of the reasons, so disconnect the power as much as possible before going to bed.
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2. The charger cooling fan is damaged. When the charger is working, it is necessary to convert the high voltage into a low voltage. Therefore, the charging time is long, the transformer coil will generate heat, and the high temperature will cause fire when the ventilation is poor.
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3, the advantages and disadvantages of the charger. Inferior chargers or substandard chargers are more prone to heat and fire, especially with Japanese electric vehicles. The standard voltage in Japan is 110V, and the domestic standard voltage is 220V. If it is directly charged, it is easy to catch fire.
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4. The battery seal is too dead. Lead-zinc batteries generate oxygen and hydrogen when they are charged. If they are poorly ventilated and encounter high-temperature sources, they will not only catch fire but also explode. The battery seal is too dead, the gas generated by the charge will not be released, and it will explode and catch fire when it reaches a certain pressure.
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5. The charger plug is wet. The charger plug is wet and easily causes a short circuit. When it is raining or when it is wet, check the charging interface and recharge it.
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In addition, the electric vehicle should be charged outdoors as much as possible, or the battery should be removed and charged separately. To select the appropriate wire diameter for the charging circuit, the circuit laying should be fixed and installed, and short circuit and leakage protection devices should be installed. The vehicle should be charged to avoid charging for too long. It should be charged according to the instructions. The charging time should not exceed 10 hours in principle. (This article is based on Qianjiang Evening News, Zhongshan Hot News, Nanning Security Supervision)
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