[TechWeb] the development of new energy vehicles has entered the fast lane in recent years, but the pain point of using vehicles in winter is always difficult to avoid.
As the temperature drops sharply, battery activity weakens, battery life shrinks, and charging time increases, these problems make many new energy car owners miserable in winter.
A few days ago, ideal Automobile held the Winter vehicle Technology Day in Beijing, and introduced a set of methodologies of ideal Mega and ideal L6 for winter car use scenarios.
In the face of these common problems in these industries, ideal Automobile has proposed a set of full-link solutions covering thermal management, battery performance and intelligent control.
From breaking the bottleneck of battery performance in low temperature environment to optimizing the energy allocation of thermal management system, it has set a new benchmark for winter travel.
Industry problem: winter service life, charging efficiency has become a stubborn disease, new energy vehicle winter life “shrinking”, has been a pain point for car owners in the north.
The main reason is the change of physical properties of materials at low temperature.
For example, at-7 ℃, the rolling resistance of the tire increases by 50% compared with the normal temperature, the wind resistance increases by 10%, the efficiency decreases by 2% due to the thickening of the lubricating oil in the drive system, and the drag resistance of calipers and bearings also increases by 50%.
In the process of using a car in winter, cockpit heating is an energy-consuming “large” to turn on air-conditioning in the car in winter, in addition to the need to consider heating, there is another problem that must be solved is fog.
The warm and humid air in the car encounters cold glass and fogs easily.
A common solution is to turn on the external circulation of the air conditioner and introduce dry and cool air outside the car to remove fog.
However, compared to allowing warm air to circulate in the car, turning on the external circulation means an additional heating burden, which is bound to lead to an increase in air conditioning energy consumption.
In addition, charging in winter is not as fast as in other seasons, which is a problem for many new energy car owners.
With the sudden drop in temperature and the weakening of battery activity, the charging time of electric vehicles is often greatly increased.
At room temperature, it usually takes about 30 minutes for a traditional 2C battery system to charge from 10% to 80%, but at low temperatures, the corresponding charging time is extended to about 50 minutes.
The technical solution of the ideal car: the overall improvement from battery to thermal management, in view of the difficult problems in the industry, the ideal car provides a set of technical solutions for the winter life problem through the two-way strategy of “open source” and “throttling”.
Open source: to improve battery performance from the source, the Kirin 5C battery developed in the ideal car United Ningde era significantly reduces the internal resistance of the cell by optimizing the cathode material, low viscosity and high conductivity electrolyte and diaphragm design.
In an environment of minus 10 ℃, Kirin batteries can still achieve a 5C charging rate with a range of 500km in just 12 minutes, which is well above the industry average.
To innovate the heat dissipation structure, compared with the traditional bottom cooling plate cooling scheme, the ideal automobile adopts sandwich liquid cooling structure, which makes the coolant in direct contact with the core, and the heat exchange area is increased by 5 times.
Even in extremely cold conditions, the battery can be heated at a rate of up to 1.
2 ℃ per minute.
Intelligent algorithm optimization, self-developed ATR power estimation algorithm, through the real-time analysis of battery charge and discharge trajectory, the power estimation error of lithium iron phosphate battery is reduced to 3% Mel 5%.
This breakthrough makes the performance of ideal L6 and other models more stable in the low temperature range in winter, increasing the discharge power by about 3% compared with the traditional algorithm.
Throttling: fine design of thermal management system, multi-source heat pump system: efficient heating, ideal automobile self-developed heat pump system has 43 modes, can flexibly cope with different temperatures and use scenarios.
For example, using the waste heat of coolant to activate the heat pump unit in the heating process can not only save energy consumption, but also significantly improve the heating speed.
Compared with traditional PTC heaters, this system consumes more than 20% less energy and makes less noise.
Double-layer flow air conditioning box, innovative air intake layered design, fresh air distributed in the upper layer, warm air concentrated in the lower layer, greatly reducing the heating load.
In a-7 ℃ environment, the energy saving effect of this design is equivalent to extending the mileage by 3.6km. With accurate heat distribution, the ideal car ensures a balanced heat distribution in the driver’s feet, occupant seats and head areas by optimizing the design of air ducts and air outlets.
For example, a new air outlet is added in the main driving position to accurately deliver heat to the ankle area, significantly improving the comfort in the low temperature environment, intelligent enabling: making the winter car more convenient, and the ideal car has also carried out a number of upgrades in terms of intelligent experience.
strive to make winter car use more efficient and convenient.
Navigation linkage preheating, after the user sets the navigation to the overcharging station, the system will automatically adjust the battery preheating time and temperature according to the real-time distance and battery status to ensure that the battery has reached the best charging state when arriving at the station.
The OTA is continuously optimized, and the ideal car is pushed through the OTA, further improving the efficiency of the charging terminal.
For example, reducing the time it takes to charge a battery from 80% to 95% to 17 minutes has greatly improved the user’s recharge experience.
The intelligent air conditioning system with 51 sensors can dynamically adjust the cockpit temperature according to the weather and navigation path.
For example, in tunnel scenarios, air conditioning settings are automatically optimized to ensure stable air quality and temperature in the car.
According to statistics, the CLTC service success rate of ideal MEGA in minus 10 ℃ environment is more than 80%, which is higher than the industry average of 65% and 70%.
In the actual feedback of users, the winter performance of the ideal car is widely recognized, and the technical breakthrough of its multi-source heat pump heating and Kirin 5C battery is particularly prominent in long-distance driving in cold areas.
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