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[YesAuto New Energy] Super broadcast, every week. Recently, oil prices have been gratifying, and the topic on Weibo has also been crowded with this: If oil prices continue to be like this, where is the necessity of the new energy “major trend”? Obviously, netizens will never get tired of discussing the “life and death” of fuel vehicles and new energy vehicles. Therefore, in this week’s topic screening, we also selected a product related to the hot discussion. We also hope that the views in our super broadcast this week can give you some new thinking.

Carhome released the first test of Xiaopeng Motors P7 on the whole network last weekend. This car is a product that has attracted a lot of attention in new cars since the beginning of the year. Especially in the new car information display of the Ministry of Industry and Information Technology in early March, the P7 was announced. Its cruising range exceeds 700km. This value has once again sparked everyone’s heated debate: Is the 700km cruising range high enough? Will your mileage anxiety disappear? Is there still room for further improvement in the battery life of pure electric vehicles in the future?

● Breaking through 700km, No. 1 in domestic mass-produced cars

The 700km battery life is an unattainable data for pure electric vehicles a few years ago. Even at the moment, 700km is still much higher than the market average (currently the average battery life is about 450km). Ultra-high battery life has become the first focus of this product, and P7 has also become the product with the highest battery life in domestic and even global mass-produced cars. (Click to review: internal and external repair test Xiaopeng Motors P7 four-wheel drive high-performance version)

In the test article, we did not actually interpret the vehicle's cruising range too much. Since the product is still in the state of trial installation, we are more discussing the dynamic performance of the vehicle in the test. At present, the official information on the P7 battery system of Xiaopeng Motors is relatively limited, and among the eight official product configurations, only the rear-drive ultra-long-endurance version has reached the NEDC standard of 706km.

From the currently known information, Xiaopeng Motors P7 does not use a large-capacity battery pack. The rear-drive version and the four-wheel-drive version use 81kWh and 71kWh ternary lithium (NCM811) batteries respectively. The energy density has reached 170Wh/kg, and the weight of the entire battery pack is 490kg.

In addition, it should be noted that the 706km cruising range of the P7 rear-drive ultra-long-endurance model of Xiaopeng Motors can be achieved only after the low-profile model is equipped with an aerodynamic package (wheel cover). Wheel covers with low wind resistance are currently favored by many electric vehicle manufacturers, including Tesla and BMW, which have launched corresponding kits to increase the vehicle's cruising range.

Therefore, it can be seen that the drag coefficient is of great help to the optimization of vehicle energy consumption, and this principle is the same for fuel vehicles. In fact, many people think that the capacity of stacked battery packs is the main way to improve battery life, but it is not the case. The weight of the battery pack itself has a balance with the overall lightweight of the car body. Brainless stacked battery packs can not effectively improve the battery life, but will disappear. He broke the balance.

After the release of the first test article, we also invited Mr. Li Pengcheng, vice president of Xiaopeng Motors, to the car home this week. He also talked about in the live broadcast that the cruising range is the most concerned indicator of new energy vehicles, and car companies also It is hoped that the endurance can be continuously enhanced through technical means, but on the contrary, the brainless improvement of the endurance may bring various side effects, leading to the opposite of the thing.

Therefore, another product is inserted here, which is BYD's flagship sedan to be released this year: Han. This car also takes into account all aspects of comprehensive performance. From the currently known information, Han’s battery pack capacity is only 71kWh, and the single-motor version has a cruising range of more than 600km. The same as the Xiaopeng P7 is that Han The optimization of wind resistance is also a key point to improve the endurance.

Is there room for improvement in future battery life?

Will the battery life of pure electric vehicles continue to increase? This question also applies to fuel vehicles, but when the vehicle meets the consumer's endurance requirements, how much is the significance and necessity of continuing to improve? Judging from our current daily travel scenarios, after the battery life exceeds 600km, it can basically cover all short- and medium-distance trips. Especially for urban commuting, high endurance will greatly solve the time cost of charging. Therefore, does it make sense to continue to improve battery life? Is there room for further improvement in battery life?

We have also discussed in the previous article that when the power battery technology cannot undergo qualitative change iterations, under the premise of the balance point we mentioned above, 700km-800km should be the limit of the current mass-produced pure electric vehicle power battery (continue to improve Or break the balance), and this endurance index has basically reached our recognition of car endurance. In the next stage, where should the technology be improved?

In addition to battery life, energy supply efficiency should be our second biggest question about new energy vehicles. Because even if the mileage of fuel vehicles is not high enough, they have high coverage gas stations and replenishment efficiency, which directly solves the problem of mileage anxiety. The key to pure electric vehicles lies in the fact that not only the efficiency of energy replenishment cannot be compared with that of fuel vehicles, but at present, the density of charging stations is far less than the throughput of gas stations.

Therefore, providing the energy replenishment efficiency and method of pure electric vehicles will be the second direction of technological development after the vehicle's cruising range has reached approval. Externally, increase the technological upgrading of high-power charging stations, and gradually continue to increase the charging power on the basis of the existing domestic public charging stations of 120kW. On the vehicle, upgrade the vehicle's charger technology and control technology to allow the vehicle to obtain faster energy supply efficiency under high-power DC charging conditions.

Although there is still a gap between the energy replenishment efficiency of fuel vehicles, taking Tesla as an example, energy replenishment technology still has a long way to go in pure electric vehicles. The charging conditions outside the vehicle and the charging technology inside the vehicle still have a lot of room for improvement, and this part is exactly where users and car companies are equally concerned after the endurance indicators are reached. From the currently known new cars to be marketed in 2020, the overall endurance level has exceeded 600km, so we also believe that the long-lasting endurance pursuit may come to an end this year.

Super broadcast comment:

It is undeniable that the changes in new energy vehicles are obvious to all. In a few years, the products have made breakthroughs in many of the “stubborn problems” we thought before. Today’s topic reminds me of a previous conversation with a charging technical engineer. He conceived a future scenario for me: the charging pile is no longer a heavy box, but a crystal interface like an optical fiber network cable. , Because the volume becomes smaller, any parking space can be equipped with such a charging port, and the popularization speed will be greatly improved. At the same time, he also said that such a vision, judging from the current speed of technological progress, is not too far away.