The first factor is battery capacity. For electric vehicles, the most direct impact on battery life is battery capacity. The larger the capacity of the battery, the longer the car's range. When the battery capacity is larger, the weight of the electric car is too heavy, which also leads to the decrease of the car's range. Therefore, the density of car batteries is also one of the important reasons for measuring cars. The greater the density, the greater the battery capacity, which also means that the power battery has higher power generation and longer range.
The second factor is the drag coefficient. Everyone may not be very clear about the drag coefficient. It mainly refers to the power output used by the car to overcome the resistance in the air while driving. Previous studies have shown that when a car is traveling at 60 speeds, 60% of its power is used to overcome the resistance of the car. Therefore, the lower the resistance of the car, the longer its cruising range and the lower its power consumption. This has also led to the use of black technologies in the production of many new energy vehicles, such as hidden door handles, closed grilles, car wheels, etc., which can effectively reduce car wind resistance and enhance battery life.
The third factor is the weight and load capacity of the vehicle. The heavier the car, the greater the energy it consumes and therefore the greater the drag it generates. The vehicle needs to consume more energy during acceleration. Some research scientists have shown that when the weight of a car is reduced by 100 kilograms, the cruising range can be increased by 10% to 11%. This has also led many car companies to adopt lightweight designs when producing cars. For example, Weilai Automobile An aluminum structure is used to manufacture the body, which reduces the weight of the vehicle and enhances battery life.
The fourth factor is the temperature factor. Pure electric vehicles can maintain normal driving at normal temperatures, but when the weather gets cold, the activity of the battery pack decreases, resulting in a decrease in discharge, which will inevitably lead to a decrease in the vehicle's cruising range. Therefore, in winter, the range of pure electric vehicles will drop off a cliff.
The fifth factor is charging habits. Many people should understand that when we charge our mobile phones, too many times of charging will cause the battery capacity to decrease. The same is true for power batteries. The habit of charging will directly cause the loss of battery power and reduce the activity of the battery to a certain extent. Therefore, in our daily life, we must conduct a complete discharge every month and then fully charge the battery.
Do electric vehicles need wind tunnel testing?
For the current development of pure electric vehicles, many consumers are concerned about the cruising range. . It is true that the cruising range does affect the convenience of using the car, but the level of wind resistance is also very important. And according to relevant research, for pure electric vehicles, for every 10% reduction in the drag coefficient, the cruising range can be increased by about 3%, assuming other factors remain unchanged. So what are the methods for reducing wind resistance in pure electric vehicles?
What factors affect wind resistance?
In fact, wind resistance is air resistance, and the influencing factors generally include wind resistance coefficient, front area, air density and speed. Among them, the drag coefficient and the frontArea is the main indicator of vehicle aerodynamic performance, and for speed, the greater the speed, the greater the air resistance. Speed is calculated as a square, so when the speed doubles, the resistance doubles.
Methods to reduce wind resistance
The car itself is a means of transportation, and pure electric vehicles are no exception. Therefore, from the factors that affect air resistance, we generally use the wind resistance coefficient and front area to achieve it. Reduce wind resistance. For example, in terms of design, the aerodynamic performance of new energy vehicles can be improved and the front area reduced. The flow design style adopted by many cars at present is based on this reason. In addition, a flatter chassis can also be used to reduce passing resistance. In addition, pure electric vehicles themselves do not have an intake and exhaust system, so the chassis can be designed to be flatter, thereby obtaining good aerodynamic performance.
For car owners, good driving habits can also reduce wind resistance. For example, try to keep the four-door windows closed while driving, and if you want to modify the vehicle, try not to modify the front of the vehicle. Because the front of the vehicle is modified, the resistance is likely to increase due to the increased area, which will reduce the aerodynamic performance of the vehicle. As for the luggage rack on the roof, if there is no need, you can try to remove it.
Summary?
So for pure electric vehicles, the most effective way to reduce wind resistance is to improve the aerodynamic performance of the vehicle. Reducing wind resistance can extend the cruising range to a certain extent. But in addition, it is also necessary to improve the energy density of the battery through technological research and development to achieve the real purpose of extending battery life.
This article comes from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.
Required. Through wind tunnel testing, the wind resistance coefficient of electric vehicles is reduced as much as possible and the energy consumption during vehicle driving is reduced, thereby improving the vehicle's cruising range performance and product competitiveness. At the same time, it can help electric vehicles find a balance point between optimizing the heat dissipation effect of the battery pack and reducing the vehicle's wind resistance coefficient. Therefore, wind tunnel testing is also of great significance to pure electric vehicles.
First of all, as a pure electric vehicle, cruising range is very important to the vehicle. In order to improve the cruising range of the vehicle, in addition to increasing the capacity of the battery pack, reducing energy loss is also a good way. Therefore, if the wind resistance coefficient Cd value of a pure electric vehicle is low, unnecessary energy consumption caused by wind resistance during driving can be reduced, and it is also beneficial to increase the vehicle's cruising range. Therefore, wind tunnel testing of electric vehicles can help reduce the drag coefficient Cd value and improve the vehicle's cruising range. Second, thermal management of EV battery packs is critical to optimizing EV performance. The battery pack radiator is closely related to the thermal management of the electric vehicle battery pack and is directly related to the aerodynamic design of the vehicle. Therefore, wind tunnel testing can help vehicles improve their aerodynamic design and is also helpful in improving the effectiveness of electric vehicle battery radiators. Finally, although electric vehicles have no engine noise, they still have wind noise. Electric vehicle wind tunnel testing can effectively help vehicles reduce R&&;D wind noise during the period makes the riding experience of electric vehicles quieter and more comfortable, further enhancing the competitiveness of the product.
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