In theory, no car can drive safely in water, whether it is a fuel car, a hybrid car or an electric car; Unless there is an emergency, this dangerous operation is not recommended, especially in areas that have reached the level of flooding. On the other hand, the ability to drive in water is really important. Vehicles that can run normally in the water in an emergency can leave the dangerous area at least at the first time. Only the hybrid car with this electric drive system will "leak" or "short circuit" when driving in water. After all, the voltage of these battery packs is as high as 500V, which seems worrying.
According to the industry standard "Technical Requirements and Test Methods for Safety of Power Batteries for Electric Vehicles", there are strict requirements for the safety test of power batteries.
1: The safety inspection process of power battery (cell) is that after the battery is fully charged, the whole battery is immersed in 3.5% sodium chloride (NaCL) solution for 2 hours-the key point is "soaking" instead of standing, and then it is taken out for observation 1 hour. Only when there is no problem can it be considered as a qualified cell.
Batteries are connected in series or in series and parallel to form modules, and multiple modules, together with components encapsulated by temperature control system and control unit, are called battery packs or battery packs.
2. The power battery pack (assembly) should also be tested. The standard is also to soak in the same concentration of sodium chloride brine for two hours, and then observe 1 hour. Only a battery pack without problems is considered as a qualified battery pack.
If there is a fire or deflagration problem in the battery cell or battery pack during the test, the monomer and the total score are unqualified! The key point is whether this standard is the lowest standard in the industry or the bottom line of technical conditions for safe operation of motor vehicles; Responsible car companies will have very strict requirements on the safety of electric drive systems, so the waterproof performance of battery packs will generally be stronger. In fact, some brands of battery packs can be soaked for 24 hours as a whole, and there is no water problem in the battery pack after the test.
"Wiring harness" is a big problem. The battery pack is very waterproof, but is the wiring harness connecting the battery and the motor that waterproof? The answer is yes. Because the transmission of current can't contact water, turbid water has good conductivity, and once the whole harness is immersed in water, it will be short-circuited once it contacts water; The rapid rise of battery after short circuit will cause natural and even deflagration problems, which is very dangerous.
Therefore, the wiring harness of the vehicle must be strictly waterproof, and both the wiring harness and the battery pack can meet the sealing standard of IP67. Then of course, there is no need to worry about the wading of these cars. After all, the normal operation of the motor does not need air, current conversion magnetic field and permanent magnet mutually exclusive conversion power.
Core question-Is the charging module protected? Electric energy can be input when the car is charging, so if the water overflows the charging socket, will it cause a short circuit?
Since we can think of this problem as users, engineers will certainly think of it; First of all, the cover of the charging socket is often waterproof. At least in recent years, all vehicles have this design. When the cover plate is pressed, obvious damping can be felt. When the cover plate is pressed, it can play a considerable degree of waterproof protection. The specific level can be used for reference, but the flood will definitely not enter the water, or it may be soaked for a long time. Therefore, even if it is not IP67 standard, the waterproof standard should have the level of "6".
The core waterproof design does not depend on the cover plate. When the charging gun is not inserted correctly, the female seat of the charging interface is actually inaccessible, that is, it is always in a "power off state"; In addition to several huge contacts, the charging base has a "connection confirmation port" design at the top. Only when the charging gun is correctly inserted into the charging interface and connected to the confirmation hole can the current be input to start charging the power battery pack.
Therefore, as long as it is not wading in the charging state (which is impossible), there is no need to worry about short circuit even if the charging port is flooded; When charging, if it is flooded, the protection program will stop charging instantly to prevent short circuit. This protection scheme is actually a long time, and old electric vehicles will also have it.
To sum up, the wading ability of electric vehicles and plug-in hybrid vehicles is really strong. If you drive in pure electric mode, you can drive normally even if the vehicle is flooded to more than half. However, it is still not recommended to operate blindly, especially for some cross-country enthusiasts. The Prado drowning incident is still fresh in my mind. Cherish your life and don't "die".
Finally, according to the current PACK technical standard of power battery pack, it is no problem to park the vehicle in water for several days or even longer, because the battery pack is always in the chassis position, and the water pressure from bottom to top is very low, so it is difficult to destroy the sealing performance of the battery pack; Therefore, there is no problem with a large number of new energy vehicles in the floods in Henan Province. However, if it is really soaked for an unknown number of days, the slow water seepage of the battery pack may also cause short-circuit spontaneous combustion. Fortunately, the rescue will always be timely, and there is basically no chance for such a problem.
(External discharge used to be BYD's patented technology. It is a special plug that is reversely linked through the charging interface, which can discharge 3.3kw of electricity; Hybrid cars can use internal combustion engines to generate electricity, which is still very useful at critical times)
Published by Tianhe MCN, all rights reserved.
BYD can do it, other cars don't know, and Tesla probably can't.
Lithium batteries are not as fragile as you think.
This outdoor power supply once fell into a pond when users were fishing.
Pick it up and bask in the sun. When the hair dryer blows, it will work as usual as if nothing happened.
Of course, waterproof is graded, and it is not once and for all. And it must be clear that not all BYD's electric cars can wade, and the waterproof rating of each car must be clearly seen.
Tucki p7, pure electric bubble water will definitely be bad, but it can take you to a safe place first, and then you will lie down after a lot of water enters the car, instead of rushing out of the deep water area and lying down directly after the water enters.
How ridiculous your question is. If the vehicle is short-circuited, the water so deep and the distance so far will not move for a long time. The owner will send a few people to the hospital and come back after delivery.