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Electric vehicle charging accidents continue, how to avoid such accidents?


2021-08-28


electric car

While electric vehicles bring convenience to everyone

It also brings traffic safety hazards that cannot be ignored

Data Display

80% of EV fires start while charging

The electric car fire caused casualties

90% are due to placing it in the foyer or aisle

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How terrible are electric car fires?

      The special hazards of fires caused by electric vehicles are manifested in two points, namely, the temperature of the fire site and toxic smoke. The data shows that in 3 minutes, the fire temperature reached a thousand degrees; in 30 seconds, the poisonous gas covered the entire room.

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The flue gas temperature can exceed 1000 degrees

High temperature poisonous smoke is more deadly than open fire

When do electric vehicle fires usually occur?

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      More than half of electric vehicle fires occur while charging at night. According to past cases, electric vehicle fire casualties generally occur when charging at night. Many people are charging in the corridor. This time period is often when people are asleep. Even if they find it, they often have no time to escape.

      The electric car was placed in the corridor, directly cutting off the escape route. The electric vehicle combustion experiment proves that once the electric vehicle burns, the poisonous smoke rises rapidly at a speed of 1 meter per second, so the electric vehicle on the first floor will soon cause the entire building to fall into a state of toxic smoke, which will easily cause casualties. Even group death and group injury fire accident.

 

The most complete electric vehicle charging knowledge

01

How do you think it's time to charge your electric car?

      The voltage dial shows that if the voltage pointer quickly drops from the high position "H" to the low position "L" after you get on the bike, it means it's time to charge.

02

How to charge correctly?

      First of all, it is recommended to carefully read the instruction manual and charging precautions before charging, which will be of great help to you on how to use the electric vehicle correctly. Then prepare the socket, charger, etc. Confirm that the output voltage of the charger is consistent with that of the battery, and the polarity is the same. First connect the battery plug of the electric vehicle, connect the three-hole plug of the charger to the electric vehicle, and then connect the 220V power supply, which is generally used for household electricity. Charging should be in a ventilated place indoors. If it is outdoors or exposed to direct sunlight, it is best to cover it with something to avoid fire. Do not charge it upside down. There is a fan inside the charger. If the fan moves and makes a sound, and the indicator light is on and red, it means it is charging normally.

03

If conditions permit, choose to charge during the day as much as possible.

Easy to control charging time

      Everyone knows that the battery should be fully charged when charging for the first time, but being fully charged does not mean overcharging, and there must be a limit. It is easy to control the charging time during the daytime charging, so that the battery will not be overcharged and discharged for the first time, which is easier. Let the first chemical reaction in the battery be normal, not to say that it is impossible at night, as long as you can control the time.

04

5~6 hours in summer, 8~10 hours in winter,

avoid overcharging

      When the electric vehicle battery leaves the factory, it has not experienced complete charging and discharging. In order to ensure the normal operation of the battery, in general, the charging time is about 5-6 hours in summer and 8-10 hours in winter. The storage capacity can reach more than 80%, and then float charge for 1-2 hours. The charging time can be slightly extended during subsequent use. Charging during the day can better control the time.

      After the battery has been used for half a year, it is recommended to deeply discharge the battery once a month, and then charge the battery of the electric vehicle after the deep discharge, and the time is controlled within 12 hours. This will be of great benefit to the power recovery of the battery of the electric vehicle.

05

how much power is left

Is it better to recharge?

Under normal circumstances for electric vehicles (not often with people, not climbing all day), it is best to charge when the remaining battery power is between 30% and 50%, which can not only avoid the early capacity loss of the battery, but also avoid over-discharge; If you often take people with you or climb hills, it is recommended to charge the remaining power at 50%; if you go out or leave it for a long time, the battery will self-discharge and cause "running power", and the battery loss will seriously affect the service life of the battery. It is recommended to charge it once a month. .

06

Is it better to charge more frequently?

      It is right to charge the battery frequently, and charge it after riding every day, but the situation is like this, if your battery can run 30 kilometers, it is not good for the battery to charge it after running 5 kilometers or 10 kilometers. Because when the battery is fully charged, there will definitely be gas overflow, and this gas is produced by the decomposition of water in the electrolyte, so dehydration will occur. Frequent charging in this way will increase the number of dehydration of the battery. It will also expire soon.

      So a good way is that if you don't ride an electric bike for the next few days, you'd better charge it fully, but when you ride 5 kilometers or 10 kilometers, the next day's distance is still enough to run, it's best It is better to charge the battery after riding the next day, so that the water loss of the battery will be reduced, and the life of the battery will be extended.

07

Safety issues to keep in mind

      When an electric vehicle is charged for the first time, the charger may generate heat very quickly. Especially when charging in summer, the charger should not be placed on objects that are prone to heat and burn, and it is best not to place it on the seat of the battery car. First, prevent fires, because many people have spontaneous combustion of battery cars when they are charging, please pay attention. If you are charging indoors in winter, you should also pay attention to ventilation, cleanliness, and the temperature should not be too high. At this time, it is necessary to match a professional charger.

Precautions

      Be sure to unplug the battery after charging. Because 80% of the current chargers on the market do not have a self-power-off function. If the charging time is too long, the life of the battery will be greatly reduced. If it exceeds 1 day and 1 night, your battery is very likely to be "exploded". No matter how long it takes, the deformation will be more serious, and the battery box will often burst, which may cause a fire! Everyone must pay attention.

 

From "Global Electric Vehicle Network":  http://www.qqddc.com/html/news/201905/news_52662.html