Low temperature test is a project that must be faced in the development process of electric vehicles. Pen % fun % Pavilion www.biquge.info

In general, almost all power batteries will be affected by low temperature and have problems such as reduced mileage and low charging efficiency, but due to the characteristics of batteries with different attributes, the degree of influence is slightly different, after all, this is determined by the characteristics of the battery, because in the low temperature environment, the electrolyte becomes viscous, the chemical reaction inside the battery becomes sluggish, and the discharge current becomes smaller, resulting in a decrease in the usable capacity of the battery and low charging efficiency.

Even in recent years, the international lithium battery system for electric vehicles has been researched and developed, but the materials and characteristics determine that the availability of batteries at low temperatures is greatly reduced, which is a worldwide problem, in this regard, in fact, domestic enterprises in the battery, electrolyte and other aspects of the level are very high, even better than many foreign companies.

And the royal blue car that is speeding in the ice and snow is Sarlihard, which is transported thousands of miles away to the far north of the EMP to carry out battery adaptation in this extreme weather.

Among the personnel who record the test data, including the project R&D personnel, including the engineering staff of the EMP-Supermicro Electric Vehicle Battery R&D Laboratory, closely monitor and record the overall data of the vehicle battery through the professional instruments installed in the internal battery system of the electric vehicle.

"The real-time temperature is -27C, and the total range of this full-charge driving is 335km, and the loss rate of power is nearly 25%......"

When the original gallop exhausted the last trace of power and slowly stopped in the ice and snow, a data recorder loudly reported the results of the test.

"This is the fifteenth consecutive test in these days, after testing in such severe cold conditions every day, although the battery is squeezed until the oil runs out every time, it is obvious that the service life of the battery has no signs of attenuation, and the test results have been relatively stable......

An engineer in the battery lab compared the data from a previous period of time and came to a conclusion.

Although it is still a bit premature to draw such a conclusion, after all, it is only fifteen limit tests, but these experienced engineers can still see the essence through the phenomenon and judge it in advance.

Since the successful development of the battery in late June, the project developers and engineers of the battery laboratory have almost traveled all over the country, leaving their test footprints in various places with complex terrain, and in this cold Russia, it is the last stop of the performance test.

According to their test results, the ternary lithium battery developed by the current battery laboratory, with the battery management system developed by EMP, can make the maximum cruising range reach 441km, of course, this is in the case of very ideal road conditions and the surrounding environment, under the general total road conditions, the average cruising range can reach 4m.

Although the current ternary lithium battery is only the first generation of products developed by the battery laboratory, there are all kinds of shortcomings, such as in the cold test just now, the loss rate of battery power has reached 1/4, but after all, such conditions are more extreme, on the whole, for the performance of the first generation of products, whether it is the R & D personnel or the engineers of the battery laboratory, they are satisfied with it, and it is considered to have reached the numerical standard of the initial design.

Relying on the large-capacity battery pack, it is very stable in the 0C test environment, with an average range of 412km, which is basically not very affected by low temperatures, and in the process of driving, it will not sacrifice power and driving pleasure at all.

Even though the current EMP still has various shortcomings and shortcomings, it is undeniable that through the step-by-step progress of the project, the overall technology of EMP has developed by leaps and bounds, and considerable experience and a large amount of valuable experimental data have been accumulated in the process.

If the original EMP was only a strong side of the domestic electric vehicle market, then now with the support and development of electric vehicles, EMP has left other competitors far behind at the technical level.

"This hellish place, it's really freezing to death!"

The driver in the car got out of the cockpit, stomped his feet, and felt a cold wind constantly burrowing into his clothes, which made him shiver a few times, subconsciously wrapped his clothes tightly, and then cursed helplessly.

After driving more than 300 kilometers uninterrupted, even if there are no road restrictions here at all, you can gallop as you like, but after this test, I am still quite mentally tired.

"And, you can be content, there is still a warm wind, you see how we are frozen!"

Hearing his words, a staff member on the side raised his head and glanced at him, pursed his lips, and said with some unconvinced.

His fatigue is only mentally just, you must know that in the car is a simulation of the real car environment, what heaters, radio and the like are always on, until all the power is used up before it is completely turned off, compared with him, those who stay in the ice and snow for two or three hours, frozen so that they want to swing the engineers, he is much happier.

What's more, after a lap, he can take this opportunity to take a short break, and those hard-working staff have to push heavy high-power generators and experimental charging piles to test the relevant data of fast charging in this extreme weather, and they don't have the opportunity to rest at all.

"Haha, you've worked hard, why don't you get you a cup of coffee to warm up?" The driver suddenly realized that what he had just said inadvertently caused the anger of the public, and quickly apologized with haha, hesitated, and squeezed his eyes at the engineer again: "I still have good vodka here, this is an authentic wool goods, I brought it from the city a few days ago, come and take a sip?"

"Go, you better keep it for yourself, take it easy, don't drink too much and get drunk and go crazy and ruin the car!" And the engineers were not really angry, after hearing his words, they just laughed and cursed, and then continued to lower their heads and do their own things.

Anyway, complaining is complaining, some work still has to be done seriously, who let them do this!

Behind the progress of technology and the birth of an achievement is often the hard work of countless people and the support of thousands of data.

Under the extreme cold, it is not only the discharge of the battery pack that is affected, but even the charging has become lengthy, and it can be completed in half an hour to complete 80% of the power, this time, it took nearly twice as long to see those staff pull out the charging pin.

"Gotcha, let's go!" the driver moved his somewhat frozen body, shouted, and trotted into the cockpit, and then the royal blue car once again galloped through the ice and snow......

Today's third shift,Miraculously the code is over! Sure enough, I said that hard work will generally be done!

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