Will the water in the rainstorm of new energy vehicles be discharged like "Thunderbolt Babe"?

□ top news and Dahe newspaper reporter Kang Yafei Wen Hongbo photography

From July 18 to 19, there were showers, thunderstorms, and localized heavy rains in Zhengzhou, and the rain will continue to cover the Zhengzhou area in the next three days. The reporter visited the street and found that because of the rain, many citizens could not get on the car for a long time, and it took a long time to call for a car through T3, Xiangdao, Didi and other online booking platforms. "Now many of the taxis and online ride-hailing cars running on the road have been replaced by new energy vehicles, and I don't know if the driver is worried about the battery water, and he doesn't dare to get out of the car, and he can't get out of the car after waiting for almost half an hour."

Can driving a new energy vehicle wade into the water? Will the battery leak when wading? With these questions, the reporter conducted interviews in related fields.

Sudden rainstorms have made it difficult for new energy taxis to be killed

On the evening of July 18, a sudden rainstorm fell in Zhengzhou city, and a passenger who got on and off the new energy taxi told reporters, "Just in the car, I heard the driver say in their lecture group that the rain was too big, and after pulling this trip to prepare to collect the car."

Recently, the rain that has followed everywhere has made many new energy vehicle owners worry: is the car afraid of water? Driving a pure electric vehicle through a waterlogged road, will there be a risk of electric shock to the people in the car when the vehicle appears in the nest?

In the past, people's safety impact on the car only stayed on the vehicle's sealing and engine, air intake system, and now, the rapid development momentum of new energy vehicles, the "heart" of the vehicle is composed of batteries plus a series of circuits, electronic control components, and the complexity of the "encounter" with water can be imagined, and the safety of vehicle wading has become the focus of people's attention.

At present, zhengzhou operating vehicles are mostly new energy vehicles, on the afternoon of July 19, the staff of Henan Roewe New Energy Technology Co., Ltd. told reporters that the battery of new energy vehicles is generally near the chassis of the vehicle under the seat, therefore, the vehicle in the wading process, the battery pack will inevitably contact with the water, so in order to ensure safety, the vehicle is equipped with a protective framework, for the high-voltage part of the battery pack for special insulation protection, through a high degree of sealing to avoid including wading, collision and other external forces may cause safety impact on the battery pack.

"It can be opened normally on rainy days, and the power battery has not yet seen a situation where water ingress causes a failure." As long as it is not where the water goes, the general problem is not big. If the water is deep in the place where the vehicle is parked, the vehicle must be removed by a trailer. New energy vehicle sales staff introduced, "there is no problem with the general puddle, but it is too deep, although the car is not afraid of flooding, but if the water level is too high to pass the door, there is also a risk of rainwater seeping into the car." ”

Is it safe to drive a new energy vehicle wade in the water on a rainy day?

Du Weimin, technical director of Henan Xinshe Investment Zhongping Yunneng, told reporters that in the vast majority of cases, driving pure electric vehicles on rainy days does not have to worry at all, through the ordinary waterlogged road surface do not need to worry about the problem of vehicles appearing "lying nest" or electric shock in the car, in accordance with the "safety requirements and test methods for electric vehicle power batteries" issued by the General Administration of Quality Supervision, Inspection and Quarantine, the new energy vehicle power battery battery battery products in a fully charged state, soaked in a solution containing 3.5% sodium chloride (NaCL) for two hours, during this period, The battery pack is required to be able to use normally, and there must be no fire and explosion.

"At present, the domestic new energy vehicle battery pack uses THE IPXX protection standard in terms of protection and safety. This set of standards is mainly used to measure the dust inhalation and protection of the product's ability to soak for short periods. "Du Weimin said that the highest level of this set of standards is IP68, and the civilian grade products can reach IP67 is completely enough." 7" means that at room temperature and pressure, the shell can be briefly soaked in the water for one meter without water entering and causing harmful effects. In addition to meeting the IP67 standard, new energy vehicles must also carry out battery safety testing and testing in accordance with the standards of "Safety Requirements and Test Methods for Power Batteries for Electric Vehicles".

Will there be an electric shock to people in the car? "This depends on how the manufacturer implements, under normal circumstances, new energy vehicles should be strictly in accordance with the national standards for safety testing, if the test is qualified, there will be no leakage of electricity, because the battery is high-voltage, very dangerous, so the risk of leakage is absolutely eliminated." Du Weimin said that not only new energy cars, but also the safety standards of new energy buses are also the same implementation of the above standards.

In addition to battery packs, can motors and electrical systems withstand the same wading? It is understood that the powertrain of electric vehicles (motors, transmission systems, etc.) and cable input, output joints of the waterproof level is relatively low, mostly in line with the IPX4 or 6 protection level, the level can prevent splashing, spray water column and other effects, which means that the wire or ECU soaked in the water for a period of time, there may be water ingress, resulting in low-voltage circuit short circuit, resulting in the vehicle can not drive.

The reporter learned from the Zhengzhou Ping An Insurance Customer Service Center that in the recent week, the outlet received a total of 5 reports of new energy vehicle failures caused by rainwater, of which 3 were line failures and 1 was battery failures, mainly caused by circuit and motor failures. According to the relevant provisions of car insurance, as long as the damage caused by natural causes such as heavy rain and flooding is purchased, all or part of the loss of the motor vehicle will be compensated by the insurance company. "Whether it is a traditional fuel vehicle or a new energy vehicle, as long as the customer buys wading insurance, we are normally paid."

Who is more waterproof for fuel cars and electric vehicles?

Safety waterline is the maximum wading depth of the vehicle, although the fuel vehicle body waterproof standard is comparable to the electric vehicle, but still not as high as the IP67 standard of the electric vehicle battery pack, most of the fuel vehicle body is implemented ip65 standard, therefore, for the fuel vehicle, the maximum wading depth depends on the height of the air inlet from the ground, as long as the air inlet does not enter the water, the engine will not stop when maintaining a certain speed.

At present, the domestic new energy vehicle also has wading related standards, in general, as long as the wading depth is guaranteed within 30cm, that is, just less than half of the wheel height, you can ensure the safety of wading.

Previously, in order to verify the safety of electric vehicle wading, an automobile manufacturer's pure electric version of the vehicle challenge soaked for 12 hours, the challenge water depth of 1.7m, increase 500kg counterweight and open all windows, so that the car quickly submerged into the water, in the test, the soaked vehicle can be driven out normally, the battery electronic control motor is maintained in a normal working state.

Of course, the waterproof performance of different products is still different, and the level of its waterproof performance depends on the importance of the company itself for the safety of its own products. In general, although the wading ability of electric vehicles is strong, they still cannot be driven as a boat.

Trivia

IP67 dustproof and waterproof rating

IP protection is an abbreviation for In-gressProtection, drafted by the IEC (International Electrotechnical Commission) for short, referred to as IPXX. The first X is the dustproof level (solid protection level), the range is 0-6, which represents the protection from large particles of foreign matter to dust, and the second X is the waterproof level (liquid protection level), and the common range is 0-8, which represents the protection from vertical water droplets to the bottom pressure. Both make up the battery pack and are highly waterproof and dustproof protective equipment.

Taking "IP67" as an example, "6" means that dust cannot enter the object, the entire diameter cannot exceed the void of the shell, and "7" means that the shell is immersed in 1 meter deep water and will not cause harmful effects. In civilian equipment, IP67 is the highest level of protection, generally in the military products only have IP68 level of protection level.

Source: Big River News