Based on the actual use needs of users to purchase pure electric vehicles, 58 Automobile rushed to Swan Lake in Zhangjiakou Guyuan County, which is covered by ice and snow at minus 20 degrees and has extreme conditions, to complete an ice and snow test related to new energy vehicles. Tell you the performance of new energy vehicles in alpine conditions with the real experience of zero distance, and open up a new challenge of ice and snow of new energy vehicles. Today we take a look, how much strength can the 2021 Polar Star 2 play in the ice and snow?
Our ice and snow test is based on a comprehensive display of the comprehensive performance of the vehicle from the real way consumer cars are used. There is no time-consuming and energy-consuming full-power endurance test, we have added consumers concerned about low-temperature battery attenuation (whether the frozen overnight will lose mileage), low-temperature charging speed, low-temperature air conditioning system heating speed test, and low-temperature endurance test. Of course, there are also dynamic parts, such as ice surface elk test, ice surface steady state winding, 0-60km/h acceleration, 60-0km/h braking and other conventional experience items.
In the first test link, we chose the low-temperature battery attenuation test, that is, the electric vehicle that everyone likes to pay attention to freezes overnight in the cold outdoors, and after the next day of start-up, the meter mileage and battery percentage will not change.
Start testing
End the test
The Polestar 2 we tested is the 2021 dual-motor long endurance version with a range of 512km, equipped with a ternary lithium battery pack with a battery capacity of 78kWh. After a night of sitting, we saw a slight change in the battery percentage and range. The previous night's full charge showed 93%, and the meter display range was 480 km; the next morning, the starting battery display was 92%, and the meter display range was 470 km. We can see that the big screen shows that the outdoor temperature is -21 °C. In terms of the percentage of electricity displayed by the vehicle, the ternary lithium battery carried by the Polar Star 2 has no obvious power change, and its 78kWh battery capacity is very calm in the face of minus 20 ° C temperature.
Another indicator that consumers are most concerned about is low temperature charging. We first let the vehicle sit at minus 20° C overnight and let the vehicle cool down completely. When starting the test, use the same DC fast charger pile and record the initial data as well as the charging data for 15 minutes and 30 minutes. From the actual data we recorded, there is a trend that the charging speed of vehicles in low temperature environments is greatly reduced, and the charging time of full power is greatly extended.
We use the only two national standard fast charging piles near the test site, the data is as above, we found that the charging power can reach 35kW at the fastest.
From the actual charging test of Polar star 2, the low temperature of minus 20 ° C does seriously affect the charging speed of the vehicle, and it can be seen that the vehicle increases by 8% from the beginning of charging to the stage of charging for 15 minutes, and the charging power is 26kW. The first 15 minutes is the battery self-heating speed is faster, can quickly enter the state, to the second half, that is, the end of the 30 minutes of charging test, the second 15 minutes, the charging power is still maintained at 26kW, the power increase of more than 10%, although it is far from reaching the peak, but the speed is relatively stable, the performance of polar star 2 is still outstanding. Of course, charging in the cold environment, the battery not only takes a lot of time to restore activity, but also its own charging speed is more restricted than at room temperature. The result is that the overall charging time is significantly longer than charging in warmer areas.
Another indicator that cannot be ignored in winter cars is how long it takes for warm winds to reach a comfortable temperature. This is a test of the heating capacity of the vehicle air conditioning system at low temperatures. Throughout the test, the heating temperature and wind speed of the air conditioner were adjusted to the maximum, and we recorded the initial temperature and the values of 5 minutes and 10 minutes respectively to see if the vehicle could alleviate the cold like an ice cellar in a short period of time.
Starting temperature
The temperature outside and inside the car on the day of our test was -16°C, and the thermometer didn't seem to withstand such a temperature, showing an "L". We use the data after turning on the warm air for 5 minutes and 10 minutes according to the starting temperature of -16 ° C to simulate the scene of everyone's daily use of the car: get on the car, turn on the warm air, and start.
After turning on the air conditioner for 5 minutes
After turning on the air conditioning for 10 minutes
We saw that after 5 minutes, the thermometer showed -6.8 degrees Celsius; after 10 minutes, the vehicle showed 4.3 degrees Celsius. Since the thermometer is placed on the central handrail and has a certain delay, the actual temperature should be higher than the table. In addition, the heating of the seats and steering wheel of the whole car makes the heat transfer effect even better. After opening, the biggest benefit is that it has almost no impact on the mileage of the vehicle, and it can feel warm at all times. After all, people perceive heat in direct contact with the body much faster than changes in external temperature.
This time, we did not conduct a full-power endurance test, after all, when using a car in winter, running the electricity to nothing is not very suitable for the car scene. We record how many kilometers the vehicle has run with 10% of its electricity on a snow track. The length of the track is about 1 km, the same driver, the same brand of snow nail tires, the air conditioning temperature is adjusted to about 24 °C. The driving mode is violent driving, which tests the actual endurance performance of the vehicle at low temperatures and high power output. However, it is precisely because of this extreme way of using the car that all cars have a serious rapid power loss, and the performance mileage has a huge deviation from the actual mileage. Polestar 2 from 81% to 71% of this 10% of the power, the mileage from 410km to 360km, the table shows a power loss of 50km, the actual driving of 12km, the overall performance is still in the forefront, and the four-wheel drive system of Polar star 2 is quite stable on the ice surface, ESP can effectively intervene in correcting the skating body, and after opening the ESP sports mode, completely liberate the athletic nature, easy to control, drift on the ice even novice Xiaobai can quickly get started, impressive and very enjoyable driving.
In the ice dynamics section, we tested the ice surface elk test (emergency obstacle avoidance), ice surface steady-state orbit, 0-60km/h acceleration, and 60-0km/h braking data. The four-wheel drive Polar Star 2 performed well overall, especially in the elk test, and even completed the overtime event. The more conventional 0-60km/h acceleration and 60km/h-0 braking performance is also a good performance.
Ice-faced elk test
The test standard in the elk test refers to ISO 3888-2, which tests the vehicle's ability to avoid obstacles on the ice surface in an emergency and has a certain practical reference value. Due to the low adhesion on the ice, we controlled the speed to 25km/h, 30km/h, and 35km/h. Polar Star 2 all passed smoothly, so we also added an additional race to challenge the 40km/h test, and the result was that PoleStar 2 also passed smoothly. As a low-center of gravity car, it will be relatively more relaxed when facing such a difficult project.
The ice surface is steady-state rounded
Steady-state circle test this project is usually less common, here to explain: all vehicles in the same direction around the diameter of about 40 meters of the ring for circle, when the test car can complete the whole circle without correcting the direction of the premise, the test officially began, at this time no longer allowed to correct the direction and gradually speed up the vehicle, until the vehicle can not resist the action of centrifugal force and out of control, for the model that can not close the body stability system, we take the speed of its intervention as the evaluation standard.
Critical speed when out of control
For the four-wheel drive Polarstar 2, it is quite stable in this project, and also won the first place, and its critical speed when it is out of control is 35km, and the electronic stabilization program intervenes. For ordinary users, turning on the ice must control the pedaling force of the accelerator pedal, or even completely release. In the face of sharper corners, you must slow down in advance, and must not accelerate in the corners.
0-60km/h acceleration and 60-0km/h braking
As in the previous project, Polar star 2 in the 0-60km/h acceleration project is also very calm, the four-wheel drive system can distribute the driving force in time, help the vehicle inhibit the sliding wheel, on the ice surface of the rapid acceleration can also start calmly, so it took 5.4 seconds to accelerate to 60km/h speed, the overall performance is very good.
In the braking project, polestar 2 used 38.9m to brake from 60km per hour, after all, on the ice surface with low grip, no one can avoid the embarrassment of "foot slip". You should know that on the ordinary paved road, this distance is enough for it to stop at a speed of 100km/h, so despite being equipped with snow nail tires, if you want to drive safely, you still try to control the speed, the laws of physics can not be broken by anyone.
After static and dynamic testing, I believe you also have a more comprehensive understanding of the performance of Polestar 2 at minus 20°C. For the performance of the Polestar 2 in this low temperature environment, we feel that it is quite outstanding, although the mileage has decreased slightly, but if the travel is planned properly, it is still a reliable partner that can be used and walked.
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