Three electricity system refers to motor, battery and electronic control, which carry power, endurance, safety and other factors. It can be said that the three electricity system is the basis of new energy vehicles. In the field of new energy, it seems that the new forces of car making have been leading the latest ideas. Can’t traditional manufacturers really succeed in new energy?
A car consists of many parts, and the power system, steering and chassis are called the three major parts of the car. These three important parts are the most basic and important parts of the whole car. The quality of the three major parts will judge the success or failure of a car. In addition to the three major parts, the three electric system will also determine the success or failure of new energy vehicles such as pure electric and plug-in hybrid.
The so-called three electric system refers to the motor system, battery system and electronic control system, which respectively carry the key factors such as power, endurance and driving comfort. It can be said that the three electricity system is the infrastructure of new energy vehicles. However, in the field of new energy, it seems that the new forces of car making have been leading the latest ideas. Can’t traditional manufacturers really succeed in new energy? Is that true?
BYD Qin ev
BYD is an independent brand model that entered the field of pure electric earlier. BYD, which started with batteries, has strong advantages in the three major parts of electric vehicles. In 2018, with the advent of the new generation Tang and Qin pro, the new yuan EV launched later and the new Qin and other models, BYD’s competitiveness in the field of new energy will be further improved.
Thanks to BYD’s new “e” platform, it can adapt to different levels of models by adopting high integration and high customization capabilities. This can not only reduce the number of parts and the distance between harnesses and reduce the assembly difficulty of workers, but also further reduce the production cost, which is most directly reflected in the terminal price.
We take Qin EV listed at the end of last year as an example, and its subsidized price range is 129900-149800 yuan. The appearance adopts the dragon face design language of BYD family, which has a high degree of recognition, and has been significantly improved in terms of grade and family characteristics. In terms of body size, its length, width and height are 4675 / 1770 / 1500mm respectively, and the wheelbase is 2670mm. It is positioned between E3 and Qin pro, focusing on the market segment of compact cars.
The interior part also adopts obvious family elements. The concise center console is equipped with a rotatable 10.1-inch multimedia screen and built-in dilink2 0 intelligent networking system, which can realize many functions such as third-party app, navigation, intelligent voice control and so on.
In terms of electric vehicle hardware, Qin EV is also built based on E platform, which is composed of drive three in one, high-voltage three in one, high-performance battery and other elements.
In terms of electric drive system, the drive motor, electric control and reducer are highly integrated, which can effectively reduce the quality of the whole vehicle. In addition, integration can also reduce the connection distance between components and reduce the loss of energy consumption, so as to improve handling and reduce energy consumption.
In addition, this modular way can flexibly adjust the power level according to the model level. For example, Qin EV, which is positioned as a compact car, has a maximum motor power of 136 HP and a maximum torque of 180 nm, which has achieved a good balance between power and energy consumption.
In terms of battery, Qin EV is equipped with ternary lithium battery pack and 53.1kwh battery pack. NEDC has a endurance of 421km. At the same time, it supports the fast charging mode. In the fast charging mode, the power can be charged to 80% in only 30 minutes. At the same time, the battery is equipped with an intelligent temperature control system to preheat the battery in winter and ensure the efficiency of charging and discharging the battery in winter
High voltage charging and distribution system includes DC (DC to DC converter), OBC (on-board charger) and PDU (distribution box) digital deep integration, which makes it small, light and power density greater than 2kW / L. The battery voltage range is wide and can be adapted to various battery voltage platforms. Make the overall endurance stability better.
Summary: BYD “e” platform adopts highly integrated hardware system modularization, which can greatly reduce R & D and manufacturing costs for car enterprises. For consumers, the consumption threshold is lower, and the later maintenance is more economical and convenient. In addition, it also provides 6-year or 150000 km warranty, 8-year or 150000 km warranty for core parts, lifetime warranty for power battery cells and other warranty policies, so there is no need to worry about later maintenance.
Beijing Hyundai fista pure electric
In the field of pure electric vehicles, Beijing Hyundai has been involved relatively late. As the most important new energy product of Beijing Hyundai in 2020, fistar pure electric has filled its gap in the field of compact pure electric cars. The price of new cars after subsidies is 173800-198800 yuan. At present, it has also launched the “worry free” car purchase policy, and has its own uniqueness in the three electricity system.
In terms of appearance, the new car adopts the latest family design language of Beijing Hyundai, with dynamic and fashionable design. In particular, the sliding back shape makes it look very sporty. With the official titanium gray coating, it looks more stylish.
In terms of configuration, fistar pure electric is equipped with 7-inch LCD instrument, 10.25-inch multimedia screen and 16 ADAS intelligent driving assistance systems. Among them, the 10.25 inch central control screen is equipped with BLUElink car machine system, built-in QQ music and Baidu carlife functions, as well as mobile app remote control and intelligent voice control.
Festa pure electric adopts the three in one electric drive system, which integrates the motor, reducer and inverter, and adopts the “three in one” integrated form. Compared with the ordinary electric drive system, the integration can bring lighter weight, only 76.9kg, which can play a vital role in reducing the body weight. At the same time, it is also very helpful to improve the endurance.
In addition, the stator winding of the permanent magnet synchronous motor adopts the flat copper wire winding method, and the gap between the windings is denser and more average. Compared with the traditional round wire winding, it can further reduce the volume, make the whole motor lighter, reduce the overall energy consumption, and greatly improve the performance of the motor. At the same time, the heat conduction capacity is stronger and the heat dissipation is improved. This also makes the motor have a maximum power of 125KW and a maximum torque of 310 n · M. It has the acceleration capacity of 0-50km / h to 3.5s, and its performance has been comparable to the mainstream 2.0T gasoline engine on the market.
All fistar pure electric systems are equipped with ternary lithium battery pack with energy density of 141.4wh/kg. The battery supplier is from Ningde times, with a capacity of 56.5kwh. Thanks to the high integration of the motor, its energy consumption per 100km is only 12.7kwh, and the endurance mileage of NEDC can reach 490km. In addition, the battery is also equipped with an intelligent temperature control system and adopts a water-cooled cooling mode to keep the battery in the optimal working range of 25-45 ℃.
In terms of battery structure, fistar pure electric adopts special-shaped battery box design, and the ternary lithium battery is arranged in “Earth” shape, with full consideration of man-machine engineering, so as to ensure that the rear passengers have more ample riding space and footstep space.
In terms of charging, fistar pure electric adopts iccu two in one charging system, which can charge for 12 minutes and drive 100km under low power state. Slow charging 0-100% takes 9.5 hours, and 30% to 80% takes only 40 minutes. The equipped intelligent temperature control system will preheat the battery when the external temperature is too low to ensure the stability of charging power.
Fistar pure electric adopts the third generation IEB system of modern Mobis, which can convert the energy generated by taxiing into electric energy and store it in the battery again. The position of the shift paddle of the traditional fuel vehicle can be adjusted. The recovery level has four gears: 0, 1, 2 and 3. It can be quickly adjusted through the operation mode of “left plus right minus” of the paddle, which is very convenient.
At the same time, it is also equipped with four driving modes: Eco, comfort, sport and eco +, which can adjust the power output of the vehicle and the power of the vehicle electrical system according to the mode, so as to save energy consumption.
Summary: it can be seen that the whole power system is still very efficient and reliable. In terms of quality assurance, it also provides 3-year / 120000 km quality assurance for the whole vehicle and 8-year / 150000 km quality assurance for EV core parts (power battery, drive motor and motor controller). I think this is also the biggest reassurance for consumers. At the same time, the manufacturer has also launched additional car purchase subsidy policies and power transmission card activities, which is also very sincere.
In the field of new energy, BMW released its new sub brand I in February 2011, and launched BMW I3 for small cars and BMW I8 for sports cars in 2014. As a water test product in the field of new energy, its high pricing and niche positioning make its market performance not meet expectations. With Mercedes Benz and Audi launching mainstream pure electric models one after another, BMW also took advantage of the victory and cooperated with brilliance to sell ix3 domestically.
In terms of appearance, the BMW ix3 continues the design style of the cash fuel version X3. In terms of details, the double kidney grille outlines the outline with color shadows to highlight the identity of new energy vehicles. At the same time, the middle area of the grid adopts a simple and scientific black panel, and a hidden semi closed structure is designed, which can not only reduce the wind resistance, but also retain the air inlet cooling function. Blue trim panels have also been added to the side of the body, and a new style of 20 inch low drag wheel rim has been installed. The exhaust system is cancelled at the rear of the car and equipped with a new style of bumper. The shape is very dynamic, and the blue decoration is added to further show the identity of the model.
The interior is also similar to the cash fuel version X3, and the exclusive design of new energy vehicles is only carried out in terms of instrument display content and interior details. For the BMW ix3, the most important thing is the BMW fifth generation electric drive system (Edrive). This power system integrates motor, electronic control, gearbox and inverter, and the power density is up to 30% higher than that of the existing BMW pure electric models. In terms of motor, the vehicle adopts excitation synchronous motor for the first time, does not use rare earth elements, and reduces its dependence on scarce resources.
At the same time, the motor winding also adopts the mode of “flat wire winding”, which can improve the power density of the motor. Even if the initial model only launched the single motor version, the maximum output power of this motor reached 210 kW, the maximum torque was 400 N · m, and the acceleration time of 100 km reached 6.8 seconds. In the NEDC standard test, its energy consumption per 100 km is 16.7 kW · H. Compared with the same level of Mercedes Benz EQC and Audi e-tron, their acceleration performance in the dual motor 4WD mode is only more than 5 seconds, and there is not much difference.
In terms of battery, BMW ix3 adopts 811 nickel cobalt manganese ternary lithium ion battery with higher technical content. Compared with the existing BMW electric models, the energy density of the battery cell is increased by 20%, the total capacity of the battery pack is about 80 kW · h, the net capacity is 74 kW · h, the energy density of the battery pack system is up to 154 WH / kg, and the endurance mileage of NEDC is up to 500 km.
In terms of charging performance, the BMW ix3 adopts an integrated charging unit, which integrates the DC and AC charging control and management functions of the vehicle. Within the scope allowed by China power grid, it adopts high-speed DC charging. The maximum charging power of the vehicle can reach 100 kW, and it takes 45 minutes to charge from 0 to 80%. The maximum charging power of AC charging can reach 11 kw, and it takes 7.5 hours to charge from 0 to 100%.
Summary: BMW ix3 will be produced in brilliance BMW factory in Shenyang, China in the second half of 2020. It will be produced in line with brilliance BMW X3 flexibility, with an annual production capacity of 40000 vehicles. These measures will improve the development and production efficiency of innovative pure electric BMW ix3. Compared with Mercedes Benz EQC and Audi e-tron, the performance of BMW ix3 is more balanced, both the sense of luxury and the sense of technology are in place, and NEDC’s 500km endurance is also more advantageous.
GAC new energy aion LX
In the field of independent brands, most pure electric vehicles are still in the state of changing oil to electricity. Although this method saves cost, it has great problems in quality and endurance performance. In fact, many independent brands have developed pure electric vehicle platforms. In addition to the BYD E platform mentioned above, GAC new energy’s GEP exclusive new energy platform has also developed to the second generation.
Compared with the first generation platform, the platform mainly optimizes space utilization, power consumption and performance. Under this platform, aion s, GAC Toyota ia5, aion V and aion LX have been born. As the flagship SUV of the family, aion LX represents the highest level of the second generation GEP platform.
Positioning medium-sized SUV, the price range is 249600-349600 yuan. It has front motor, front and rear dual stand-alone and various endurance versions to choose from. In terms of appearance, the front face of the car adopts a cloud arrow family design, combined with Tiffany blue paint, which looks fashionable and full of a sense of science and technology. The rear of the car also adopts the sliding back design, and is equipped with the popular through tail lamp design. Yes, the rear of the car has more visual impact than other models of the same level.
The center console adopts a family style embracing design, and the whole car is wrapped with a large number of leather and soft materials. In addition, there are leather seams here, which cooperate with the interior color matching of black and brown to create a very high sense of luxury.
In terms of three electricity system, the models built based on GEP 2.0 platform have also been upgraded and optimized. Similarly, taking aion LX as an example, the motor of the new car adopts the e-axis motor system from Japan electric power, which integrates permanent magnet synchronous motor, gearbox and inverter, which can achieve more lightweight performance. At the same time, after integration, it can reduce the cabin volume and bring more spacious riding space to the car.
In terms of power, the new car will be equipped with different power systems according to different models. The front drive model adopts a single permanent magnet synchronous motor, and the maximum power is 135kW and 150KW respectively according to the model. The four-wheel drive high-performance model adopts front and rear dual motors, with a maximum power of 300kW, a maximum torque of 700n · m and an official acceleration of 3.9 seconds in 100 kilometers. In addition, this set of permanent magnet synchronous motor also adopts oil cooling technology, which can ensure the cooling efficiency during high load operation and keep the motor performance in the best state.
In terms of battery system, aion LX is equipped with high endurance models and the latest ncm811 cell from Ningde era, with an energy density of 180wh / kg. According to the different battery capacity and driving form, the endurance of NEDC can be divided into 503km, 520km, 600km and 650km. In terms of battery safety, the shell of the battery pack is also strengthened, and the lower shell of the battery pack is designed into double layers to reduce the damage to the battery when supporting the bottom.
The GEP 2.0 platform is also equipped with the fourth generation BMS battery management system, which can monitor the battery status in real time to avoid accidents such as battery overcharge, over discharge and heat out of control.
Full text summary
Whether it is an independent brand, joint venture brand or luxury brand, these traditional car enterprises also adopt similar ideas on fuel models when transforming to electrification, that is, platform and modularization. Compared with traditional fuel vehicles, the structure of pure electric vehicles is simpler according to different complex mechanisms such as different engines, transmissions and suspensions. Therefore, modularization can minimize the R & D cost, weaken the cost of batteries, and reflect the advantages brought by platform on the terminal price.
In addition, the highly integrated three electric system can also play a more positive role in the performance, endurance and safety performance of pure electric vehicles, which is also the R & D direction of most manufacturers. Compared with the new forces of car making, traditional manufacturers have stronger strength in terms of technical R & D personnel, technical reserves and R & D funds, and have more advantages in vehicle quality consistency and after-sales. With the development of technology, the competition in the new energy market will be more intense in the future.