On December 11, the final evaluation results released by the Winter Test Activity of Know Chedi caused an uproar in the automotive industry, and many car companies were dissatisfied with this and questioned that its testing standards were not standardized and scientific and rigorous.
It is reported that the car emperor recently tested the pure electric range achievement rate of hybrid models in severe cold conditions, and about 20 models participated in the test. Among them, BYD looked up to 8508%The endurance achievement rate ranks first, and the M7 extended range version jointly created by Huawei and Cialis ranks first, only 316%。
The above test quickly attracted a response from car companies.
Yu Chengdong, Chairman of Huawei's Intelligent Vehicle Solution BU, said: "The test of pit people misleads the people!Science and rigor are the basic rules that should be followed!”
At the same time, "AITO Auto"** also issued a response: "The relevant tests have been carried out for many long periods of time under the conditions of severe cold and continuous heating of air conditioners, which seriously deviates from the real use scenarios of users. ”
Subsequently, Great Wall Motors also joined the "battle situation" and announced that it would hold a communication meeting on December 14 at 15 o'clock to understand the winter test standards of the car emperor, which will include the scientific and fair standards of the new energy winter test, the vehicle maintenance standard of the pure electric endurance test, the vehicle power standard of the climbing angle test, and the vehicle braking standard of the climbing distance test.
Yang Xueliang, vice president of Geely Automobile Group, also commented on the matter, he said: "I also disagree, I also think that the evaluation process is unscientific, not rigorous, and the conclusions are not convincing, which not only misleads consumers, but also hurts the credibility of the car emperor itself." ”
Winter endurance is a concern
For a long time, the mileage of new energy vehicles in winter has attracted much attention, and was once regarded as the winter "curse" for the development of the new energy vehicle industry. On December 11, Beijing also ushered in the first snow, and the sudden drop in temperature also made consumers once again focus on the range of new energy vehicles.
When the price of oil rises, I want to change to a car, and when it is winter, I want to change to a car again. A driver with many years of driving experience lamented that it can be said that low temperature has become a "killer" for the mileage of new energy vehicles.
In the industry's view, the main reason for the shortening of the range of new energy vehicles in winter is the attenuation of battery performance. "On the one hand, most of the current electric vehicles use ternary lithium batteries and lithium iron phosphate batteries, due to the properties of lithium ions, their activity will decline in low temperature environments, resulting in a decrease in the net discharge rate of the battery, and the electric energy can be released normally. On the other hand, winter vehicles have a large proportion of additional electrical energy consumption, such as air conditioning, hot air, seat heating, and increased driving resistance in cold environments. Wang Chikun, managing partner of Beijing Jianggen Capital Management, said, "These are important reasons for the increase in energy consumption and the decline in mileage of electric vehicles in winter." ”
Cui Dongshu, secretary general of the passenger association, also told reporters that the current battery is a liquid battery, and the activity of the battery liquid will become worse at low temperatures, especially in the case of ultra-low temperature, the activity will become worse, and the impact on the power of the battery will be particularly large.
Car companies are actively coping with the problem of winter battery life
In the face of the problem of winter battery life, many car companies are also actively responding to it in order to break this "curse" as soon as possible.
AITO Automobile" said frankly in the first article, as a range extender model that can be fueled and electric, it can be replenished by refueling at any time, without range anxiety, under the working condition of minus 7 degrees, the WLTC comprehensive cruising range of the new M7 four-wheel drive version is 801 kilometers. In addition, the waste heat of the range extender can also be used for heating (i.e., range extender auxiliary heat), which is more safe and worry-free to drive in the extremely cold environment of ice and snow. We also recommend that users of the new M7 use the 'Smart' or 'Fuel Priority' mode under extreme conditions, taking into account the experience of extreme performance and long battery life.
There are also many car companies that have adopted battery heating, air conditioning system optimization, and denser charging networks to cope with winter range anxiety.
For example, in order to improve the heating rate, BAIC BJEV has adopted two black technologies: one is ultra-low temperature cold start, which uses the characteristics of increasing internal resistance of the battery cell at low temperature to achieve rapid heating effect through high-frequency and high-current pulse charging and discharging;The second is the all-climate battery, which quickly transfers heat to the battery cell by electrifying and generating heat for the nickel sheet between the cells.
Tesla is also very experienced in dealing with winter range. For example, the company has added a more precise temperature control system to the BMS (electronic control system) to increase the battery activity by heating the battery pack, thereby increasing the range. Not only that, Tesla has also equipped some models with heat pump air conditioners, which absorb heat from the air to maintain the temperature in the car to achieve the purpose of saving electricity.
However, in order to completely solve the winter range anxiety of new energy vehicles, further technological breakthroughs are needed. "For example, the development of new battery materials to improve the electrochemical properties of batteries so that they can still maintain good activity in low temperature environments. In addition, new charging methods, such as battery swapping modes, can also be explored to reduce energy loss due to charging. Wang Chikun told reporters.