Analysis of Electric Vehicle Electricity Recovery Technology

Have you ever thought that an electric car is actually a huge power bank? For example, when your mobile phone runs out of power, connect it to a port of an electric car to charge it. Similarly, not only mobile devices, but any other devices that use electricity as an energy source can get electricity from electric vehicles. Even when there is a power failure in your home, an electric car is the best backup power source. No need to fantasize about all this, Nissan has helped us realize it.

A few days ago, Nissan (Nissan) tested its Vehicle-To-Building technology and successfully used six Leaf electric vehicles to power its advanced R&D center in Atsugi. The combination of these 6 Leaf electric vehicles can reduce the electricity consumption of the R&D center during peak electricity consumption by 2.5%. Since Japan has also adopted a stepped peak-to-valley price algorithm, the electricity price during peak electricity consumption is slightly more expensive. With this rough calculation, the Nissan R&D Center can save 4,800 US dollars in electricity bills every year by using the electricity prepared in the Leaf electric car in advance.

From this point of view, it is an economical way to treat electric vehicles as a power reserve facility. Of course, in the Vehicle-To-Building technology, the system must ensure that the battery of the Leaf electric car is fully charged when the owner (usually a Nissan employee) is off work. However, I wonder if the developers of this technology have considered: What if someone leaves early? Another problem: charging and discharging the battery of an electric vehicle repeatedly in this way will inevitably reduce the life of the battery to a certain extent. For the laminated lithium-ion battery used by Leaf, every complete charge and discharge will cause the loss of battery raw materials, thereby reducing power. For the above problems, I believe that in the future, through the power management and scheduling mechanism, it will be completely resolved.

Nissan Leaf is the world’s first pure electric vehicle that can be delivered for daily use. It is equipped with an electric motor with a maximum output of 80kW, a battery pack capacity of 24kW.h, and a cruising range of about 135km (EPA certification). Such a car can fully satisfy the daily use of urban residents. The 5-door hatchback design and the affordable price of around US$30,000 make it the best-selling pure electric vehicle in the North American market.

What can a 24kW.h battery be used for? In Japan, the average daily power consumption of a family is about 10-12kW.h. Therefore, a Leaf electric car can theoretically provide a family with 2 days of living electricity. This is another EV battery recycling technology Leaf-To-Home that Nissan is testing. Don’t underestimate this use. In Japan, where earthquakes are frequent, power outages are an emergency that is inevitable, because Leaf’s electricity recovery can provide energy in times of crisis. From the macro level of the operation of a city, the number of electric vehicles is the reserve of backup power in the place. It is no exaggeration to say this. Of course, except for special circumstances, the Leaf-To-Home technology is still very useful in daily life. For example, when people go out on an outing, the power supply is often a headache.

The basic principle is to connect Leaf electric vehicles with the household power supply network through PCS (Power Control System). The Leaf’s battery will provide a maximum power output of 6kW, so that it can ensure that the most power-consuming household appliances (such as microwave ovens, air conditioners, etc.) can also operate normally at the same time without tripping. Such a system is of great significance for building smart, low-carbon homes, because it includes a hardware such as a car as a household appliance. It is reported that the installation price of the Leaf-To-Home system is 330,000 yen (about 19,500 yuan), which does not sound cheap.

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