With the rapid development of new energy policies and industries, more and more consumers choose to buy electric vehicles, many owners of oil trucks to trams after driving new energy vehicles, all for the new energy vehicles to accelerate fast, easy to control, intelligent configuration of high and eye-catching product advantages, sigh a sentence "really fragrant!" ”
But in the winter, many pure electric car owners will find that their car battery has become "unused", usually may only be charged once a week, and now it takes two or three days to charge once.
Of course, there is no problem with the quality of the vehicle, but a problem that all trams have to face. A while ago, some bloggers complained that this situation was like "raising a father", and electric vehicles have become "electric fathers"...
This is because pure electric vehicles do not have an engine, the battery is the source of power for the whole vehicle, at the current level of technology, lithium-ion batteries are the most mature technology, the most widely used battery form, whether it is "blade battery", "NCM811" or "high nickel battery" battery, essentially are different forms of lithium-ion batteries, but according to different package technology, different electrode materials derived from different subdivision forms.
According to the study, the optimal working temperature of lithium batteries is 20 degrees to 40 degrees. In the low temperature environment, on the one hand, the conductivity of the electrolyte decreases, and the charge transfer impedance increases, affecting the battery activity.
On the other hand, the use of warm air conditioning in low temperature environments will also affect the endurance, in the case of the original "less power", the warm air increases the power consumption, and the endurance will weaken. Conventional gasoline cars rely on engine waste heat to provide warm air and consume almost no additional energy.
However, pure electric vehicles do not have engines, need to consume additional power to heat the battery, cabins, coupled with the relatively complex working path of the thermal management system, power consumption can not be underestimated.
The above two points are the main reasons for the shrinking endurance of the winter tram, although Chongqing is not as low as the temperature in northern cities, but the wet and cold "magic attack" is indeed not good, and the average weather of 5 degrees or so is also outside the normal working temperature range of the battery.
Winter in Chongqing is like an exam for the tram, but for Gaohe HiPhi X, it is like a dimensionality reduction blow for the school bully. To this end, we also did a test to see how many points can be scored in the hiphi X final exam.
Thermostatic magic weapon
Gao He has a trick
Just like the human body needs constant temperature, electric vehicles also need to maintain the right temperature at all times to work normally, the human body has a set of immune systems to regulate in order to maintain constant temperature, and the immune system of electric vehicles is the thermal management system.
In the summer, when the power system is running at a high load for a long time, it will accumulate too much heat, the motor electronic control heat is too high, it will lead to performance degradation or even damage, and the battery heat will accelerate energy attenuation or even ignition.
At present, the thermal runaway temperature of the widely used nickel-cobalt-manganese ternary lithium battery is about 200 °C, and the thermal runaway temperature of the lithium iron phosphate battery is above 500 °C.
At this time, the thermal management system will dissipate the excess heat to ensure the safety of the vehicle and the impact of the winter temperature on the electric vehicle. We also briefly explained above that although there is no risk of ignition like in the summer, due to the reduction of battery activity, the daily car experience will have a significant impact. At this time, the thermal management system is required to heat the battery to achieve the optimal operating temperature.
Therefore, an efficient thermal management system is essential for electric vehicles.
Gaohe Automobile's CrossLoop energy management system is a very efficient thermal management system. The core of this system is a set of indirect water medium heat pumps, which transfer the heat obtained from the external environment, power batteries, and motor systems to the parts that need heat through water circulation in winter.
In the summer, excess heat can be reasonably released to ensure that all parts of the vehicle are at the most suitable temperature. This innovative energy management system can quickly make the vehicle have the right temperature, and the energy consumption can be greatly reduced by half, and in the winter, when the demand for power consumption is greater and the battery activity is reduced, the vehicle's endurance can be maximized.
A two-pronged approach
A warming trick from Gaohe
In terms of warm air conditioning, as we all know, the working principle of the hot air conditioner of the fuel vehicle is to heat the water tank through the temperature of the engine operation, and then blow the hot air into the car. The warm air conditioning of electric vehicles needs to rely on thermal management systems to achieve.
In a thermal management system, the heating element is the core component. We have two kinds of more common heating elements, the first is PTC, PTC can be simply understood as a heater, its principle is similar to the hair dryer, its advantage is to heat the air, let the warm air come quickly, but the disadvantage is also very obvious, that is, the energy consumption is quite large.
The second is the heat pump, which is also divided into two types, one is the direct heat pump, that is, the heat in the environment is absorbed into the crew compartment through a special medium, which is converted into warm air through the converter. The advantage of this method is that it has fast results and low energy consumption.
Because the heat pump can achieve both cold and hot use, the structure is more complex, the technology is relatively difficult, so the cost is relatively high, and the car company uses heat pump to heat less. In addition to the disadvantage of expensive, the direct heat pump also has a defect, that is, when the temperature difference between the inside and outside of the car is too large, its efficiency will drop sharply, usually this scene will appear after minus five degrees.
Therefore, in addition to the direct heat pump, there is also an indirect heat pump, also called a water medium heat pump. The external cold air is collected into the water medium, and then through the conversion of the converter, the hot air is sent into the car. This heating method makes up for the shortcomings of the low outdoor temperature of the direct heat pump. Of course, this cost is higher, and the choice of car companies is also very few.
The HiPhi X uses this indirect heat pump, and there is also an electrically heated PTC as an auxiliary heat source. Therefore, the most obvious feeling we have when we drive hiPhi X in winter is that the warm air conditioning of this car comes very quickly. Especially when the cold car starts in the morning, the wind warms up after a while.
Equipped with such a complex thermal management system, it is necessary not only for a warm air, but also for a more important role in reducing the impact of low temperature on lithium batteries, which is simply to alleviate the shrinkage of winter endurance.
Because each three-electric technology and the way to adopt a thermal management system are different, in such a season that is somewhat harsh for electric vehicles, the more it can reflect the strength of the product.
Before, we have also test-driven a lot of trams, in cities like Chongqing, the normal driving discount is almost 5-6 fold to start, and even more can directly fold the endurance by half, so that in the end dare not turn on the air conditioner.
Shivering in the car, while hoping to hurry to the nearest charging pile to charge, so as to turn on the air conditioner to warm up, while worrying about the power that drops faster and faster, suddenly there is no dare to step on the electric door too hard, the whole process is painful.
The battery life is not false
High-he-he-HiPhi X multi-channel live test
In terms of battery life, the Gaohe HiPhi X never seems to have worried me about this aspect.
To give you an example of a personal experience, the external temperature of the day is 12 degrees, 7:30 in the morning full power state to start, almost 5:30 at night home, because there are more things on the day, running several places a total of 107km, the warm wind has not been turned off the whole process, there is no violent driving or deliberately saving running, the computer shows the remaining mileage of 413km.
In other words, the actual mileage of 107km the driving computer consumes 137km, and the gap of less than 30% is still a good result under the working conditions of warm air in winter.
Here to share an advantage of HiPhi X over other models, that is, when the vehicle is connected to the Gaohe brand charging pile for charging, the battery pack will be preheated, that is, when the vehicle departs, it is no longer necessary to heat the cold battery pack, which is equivalent to "storing" a few more kilowatts of electricity.
In addition to the normal commute in the city, in November we also drove a self-driving tour of more than 1,700 kilometers in Western Sichuan with Gaohe HiPhi X.
At that time, the temperature in many places in Chuanxi had reached minus zero, and Gaohe HiPhi X also withstood such a test under the harsh conditions of high speed + low temperature, and became a reliable partner on the journey.
It is precisely by relying on Gaohe's excellent thermal management system that Gaohe HiPhi X can be so fearless in the face of temperature changes.
It is understood that the heat pump air conditioner of Gaohe HiPhi X can work under -18 °C working conditions, while the mainstream level is -10 °C without the ability to carry heat, so our temperature is simply a piece of cake for Gaohe HiPhi X.
Think again about the "50% off" model that scared me to open the air conditioner before, which is stronger and weaker. At the same time, this also proves that Gaohe HiPhi X is a good product that really has noodles, which is much stronger than those "vases" that play gimmicks.
This winter, the days with HiPhi X made me experience a sense of happiness on the tram for the first time. Therefore, in this year-end final exam, the answer sheet handed by HiPhi X is enough to satisfy me!