The “Power Exchange Model” recently pushed by the State Grid Corporation is not worth mentioning, but considering that people have been talking about it recently, I cannot help but say a few words. The “change mode” is to provide a viable opportunity for the “Great Leap Forward” electric vehicle that is in desperate need, or whether it wants to use it to enclose it. Motivation is for the time being, and its feasibility is single.

The so-called "change mode" is that after an electric car enters a charging station, it is not stopped there for dozens of minutes or hours, and it is charged by an external power source. Instead, it takes a few minutes to replace it with a set of well-charged batteries. Waited in line.

It sounds beautiful, but imagine how to do it.

Let's look at how to change batteries.

According to current battery technology, the weight of a battery required for an electric vehicle is at least 200 kilograms, an area of ​​at least 1 square meter, and a thickness of 20 to 30 centimeters. The previous-generation Toyota RAV4EV had a total nickel-metal-hydride battery pack of up to 450 kilograms. Today, the lithium battery pack used by BMW MINIE weighs 260 kilograms, while the battery weight of BYD E6, claiming to be "globally leading" is still a mystery. Therefore, a charging station needs to maintain at least a dozen Hercules, two or three groups, shift full-time battery, it would be better to open a gym in place, so that fitness volunteers to replace the battery to be worthwhile, of course, be careful not to break foot.

Why are you so stupid, divide the battery pack into pieces, and you don't have to split up and change! good idea. The problem is that the battery packs of electric vehicles are now all enclosed and the entire module must be kept absolutely pure between single cells and small battery packs. If the battery pack is not divided into pieces according to the requirements of the national grid, the connection between each small battery pack in the reloading will not allow slight errors and pollution. Otherwise, faults and dangers will follow. This requires that changing batteries should be done in a sealed dust-free glass cover. Vehicles and related personnel must bathe and dry beforehand; all Hercules who change batteries must be senior technicians. Even if these problems are solved, how long does it take to exchange electricity, and how high is the cost? Not as good as charging directly.

If you build an automated "battery change line" in the charging station, you can solve the above problems. maybe. But the problems it creates are more serious than the problems it solves.

The battery packs of electric vehicles are generally installed on the chassis, under the rear seats, and in the trunk. The location of different brands and models is very different, and battery specifications are also very different. Therefore, the “battery replacement line” must be flexible. In accordance with the requirements of the “Great Leap Forward” for electric vehicles, dozens of Chinese automakers are required to produce electric vehicles. At present, there are 126 models of electric vehicles that pass the New Development and Reform Commission’s new car catalog. All data on these different models and batteries should be Enter the "battery change line" computer, otherwise how many brands of electric cars will become wild dogs lose their energy, lying on the street. Also, how much does this cost?

Say battery storage again. Different electric vehicles have different battery design specifications and different performance and safety. The charging station must reserve hundreds of batteries for electric vehicles. How many reserves can be used to introduce SAP's inventory management process, but not to mention how large a warehouse area is to be built. Enough to use, is that these different types of batteries put together, will face what kind of security risks, it is also unpredictable, if not, it becomes an ammunition depot. Who wants to be a neighbor to such a charging station? If you don’t believe it, you can ask the Civil Aviation Administration of China why it is necessary to strictly limit passengers carrying lithium batteries.

Nonsense, unified battery specifications are not on the list! Well, then let all auto manufacturers overthrow their own design and research and development that used to cost billions of yuan in the past. Design and produce electric vehicles according to the unified standards of the national grid, and give me batteries. In China, the world's largest auto market, which car manufacturers dare not accept? The question is who will use the battery? Use universal? First, the responsibility for the spontaneous combustion of Hangzhou Zhongtai Electric Taxi is the issue of universal batteries or the design or assembly of Zotye vehicles.

In addition, in a country where counterfeiting is prevalent, the so-called "standard" manufacturers' battery specifications are adulterated. Who is responsible for any problems? The death caused by the explosion of a small cell phone battery is often confused by the fact that it is related to counterfeiting. If an electric vehicle carrying more than 200 kilograms of battery bombs runs through the streets in high temperatures, rain, dust storms, bumps, and collisions, this society may not be so harmonious.

Even if all of the above problems are solved, the “change mode” will ultimately depend on grid charging, while more than 80% of China’s electricity is “dirty coal power”, and CO2 emissions from the conversion of coal into electricity (171 g/km). ) Golf TSI+DSG (143 grams per kilometer) above equal power. What kind of energy is it? Or get out of clean electricity and then popularize electric cars!