current position:Home>1000km pure electric endurance is meaningless? Then why does the car factory still try its best to extend the endurance?

1000km pure electric endurance is meaningless? Then why does the car factory still try its best to extend the endurance?

2022-04-29 11:37:40Understand chedi Auto Information

With the continuous improvement of the range of pure electric models on the market , The gradual popularity of charging stations everywhere ,“ Mileage anxiety ” It seems that it is no longer the fatal problem of pure electric vehicles . achieve 600km Electric vehicles with pure electric endurance can also basically meet the use scenarios of all oil vehicles , that 1000km Is the range of the still meaningful for the pure tram type ?

Tesla founder musk also said , The endurance exceeds 400 miles (600km) Electric cars are meaningless . Xiaobian also agreed with this view very much at the beginning , First of all, if you really have a lot of needs for long-distance driving , Whether from convenience 、 Security 、 Consider the whole cycle vehicle cost and other aspects , Buying a fuel car is still a better choice at present . If you drive downtown most of the time , Even the taxi driver who works overtime runs all day 400 Many kilometers , So when the charging conditions are abundant ,600km Electric vehicles with pure electric endurance are enough to meet the needs of most people .

And I personally think , The range of pure electric models exceeds 500km After that, we should pay more attention to the safety of the vehicle 、 comfort 、 Optimize the charging speed , It really doesn't make much sense to blindly pursue the mileage . But at the same time , I also think 1000km The range is still meaningful , Do you think it's contradictory , In fact, there is a mistake here , The range I mentioned above is nominal , Not the actual endurance , The actual endurance is often based on the nominal endurance 7 fold , In other words, the nominal endurance reaches 1000km, The actual endurance reaches 700km, That still makes sense .

1000km Battery life has been officially mass produced

that 1000km Is it possible to have a nominal range of ? Of course, it's possible , GAC AIAN AION LX( picture | To configure | inquiry ) PLUS The nominal range of the thousand mile version has reached 1008km, It is also the first vehicle registered with the Ministry of industry and information technology in China 1000km A pure electric vehicle with long life , And has been officially listed for sale , The price is 46.96 Ten thousand yuan . Compared with 650km Version of ( The price is 28.66 Ten thousand yuan ), Expensive 18.3 Ten thousand yuan , The nominal range is too much 358 km , The actual endurance may be more 250km about , Give more to 18 ten thousand , Charge less electricity twice a month , Do you think it's worth it ?

Let's first get to know about GAC ea AION LX PLUS How to realize the thousand mile version 1000km Nominal endurance . First of all, there are many ways to increase mileage , The common is to enlarge the battery pack , Increase battery density , Reduce the overall weight of the body, etc , And optimize the body drag coefficient , Low rolling resistance wheel hub, etc .

And GAC AIAN AION LX PLUS The thousand mile version uses a capacity of 144.4kWh Battery pack , The biggest feature of this battery pack is the use of silicon anode , However, due to the inherent defects of silicon negative battery in battery life , Therefore, GAC EA has adopted many methods to improve this point , For example, double carbon coating , Self repairing adhesive , And various composite coating technologies in the manufacturing process , It's finally done 280Wh/kg Single cell capacity density , Higher than most batteries on the market . But because of GAC's ai'an AION LX PLUS The thousand mile version of the battery pack weighs 690kg, And the production cost is really not low , So silicon negative battery may not be 1000km Final scheme of endurance electric vehicle .

It is said to carry “ Solid state batteries ” Wei Lai of ET7 Can run 1000km?

And more recently , Weilai semi-solid battery supplier information was exposed for the first time , Chief scientist of Weilan new energy 、 Founder Li Hong revealed , The company is cooperating with Weilai , The plan is based on Wei Lai ET7 Launch single charge endurance 1000km Mixed solid-liquid electrolyte battery , And the battery is expected to start mass production by the end of this year or the first half of next year .

In Weilai ET7 On , Its battery pack capacity will reach 150kWh, The system energy density is 360Wh/kg, Based on this battery ,ET7 Endurance is expected to break through 1000km. About the battery , Zeng Shizhe, assistant vice president of Weilai automotive battery system, also explained , The battery still needs electrolyte 、 The diaphragm , So this is a battery form between liquid lithium battery and all solid lithium battery . As for all solid state batteries , Currently in mass production 、 Commercialization and other aspects still face many difficulties .

How awesome are all solid state batteries ?

Like other batteries , All solid state batteries are also composed of positive and negative electrodes and electrolytes , But all solid batteries use solid electrolyte instead of liquid electrolyte . Because lithium ions move in a solid electrolyte that is not easy to burn , Therefore, the security will be greatly improved . In theory, all solid batteries have more power storage than batteries using electrolyte 、 The output power is also greater .

Then relevant research institutions say , The charging speed of all solid state batteries will be... That of traditional batteries 10 times , The monomer energy density is expected to reach 500Wh/kg, I want to push the range of an electric car to 1000km These are easy things . So it seems , All solid state battery seems to be the ultimate form of lithium battery , But there will be no breakthrough in the short term .

In fact, engineering optimization can also effectively improve the endurance of trams

But in addition to the material of the battery itself , At present, the engineering optimization of battery pack is also a more effective solution to improve battery life , such as CTP(Cell To Pack) Technology and CTC(Cell To Chassis) technology . among CTP Technology is to integrate the cell directly into the battery pack , The battery module is reduced or omitted , Integrate the battery pack into the body floor as a part of the vehicle structure . Thus, the volume utilization rate is improved , Reduced number of parts , Improved productivity . Take the Ningde era for example , Its CTP Increased capacity utilization of battery pack 15%—20%, The number of parts has been reduced 40%, Production efficiency has improved 50%, The energy density of the battery increases 10%—15%.

and CTC The concept and of technology CTP The technology is very similar , And more radical in subtraction , Directly connect the battery 、 Integrated design of chassis and lower body , Technology to further simplify product design and production process . Effectively reduce the number of parts , While improving space utilization and system specific energy , The body and battery structure complement each other , The impact resistance of the battery and the torsional stiffness of the vehicle body are greatly improved . Run with zero CTC Take battery chassis integration technology as an example , Compared with the traditional scheme, the battery layout space is improved 14.5%, The vertical space of the vehicle body is increased 10 mm; Reduce the number of parts 20%, Reduce the cost of structural parts 15%; Improve the rigidity of the whole vehicle 25%.

Of course , I also want to further improve the range , There are various schemes , For example, in Mercedes Benz EQXX Many representative technologies have been applied in . For example, it is installed on the roof 117 A solar panel , To be able to supplement is equivalent to 25 Kilometers of electric energy ; Composite materials and integrated castings are also widely used on the body , A lot of special materials are also used in the interior , And the chassis and interior of the whole vehicle use a lot of hollow design , Therefore, the weight of the whole vehicle is only 1755 kg ; Only for 0.17Cd The drag coefficient of , There are data to show that every decrease 0.01Cd, Tram mileage can be increased 20 km .

also 0.7 Bridgestone exclusive tire with ultra-low rolling resistance coefficient , And when the speed is greater than 60km/h Open active rear diffuser, etc , So as to achieve 1008km Measured endurance , There's even... Left 15% The electricity . But the above are relative limits , Not all types of vehicles with walking volume can be applied .

summary :

The answer is very obvious ,1000km The standard cruising mileage is also very meaningful , At present, it has officially entered the stage of mass production , Although there are still many aspects to be further optimized , But completely solve “ Endurance anxiety ” It's just around the corner .

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