Through the Weimar EX5 to see how they put the electric car back to the origin of development?
Electric vehicles are not derivatives based on traditional fuel vehicles. More and more electric vehicle companies have proven this in practice.
If time goes back to a few years ago, we might think that people who devote themselves to electric vehicles should get twice the result with half the effort if they can rely on traditional automobile manufacturing experience. However, as more and more electric vehicle manufacturers pass practice, it shows that electric vehicles, as a product that can bring disruptive innovation and new value production methods to automobiles in the future, require The workload is not much less than that of a traditional car. Especially around the three-electric system, there are still a lot of problems waiting for us to discover and solve, which has also prompted more and more electric vehicle manufacturers to begin to concentrate on the positive development of core technologies for electric vehicles.
Some time ago, Weimar Motors conducted a briefing on the core technology highlights of its first product EX5 in Beijing. From it, we can see how Weimar uses four technologies and two platforms to develop electric vehicles. The core design is back to the "origin" of development.
"Electric Drive System" of Four TechnologiesThe power of the Weimar EX5 electric drive system exceeds 160kW, and the peak torque reaches 315N.m. This power level is not much different from mainstream SUVs equipped with 2.0T engines on the market (mainly for four-wheel drive), but considering the power of electric vehicles The weight of the battery, in theory, with the power level of a fuel engine, it is difficult to obtain an excellent acceleration result on an electric vehicle. However, the final 0-100km/h acceleration time of the EX5 vehicle can still be shorter than 8.5 seconds, which shows that there is still a lot of room for electric vehicles to optimize the electric drive:
First of all, the EX5 electric drive system is a product after secondary development on the basis of BorgWarner’s mature electric drive product EDM. The core components of its powertrain are independently integrated, and the entire powertrain has been greatly optimized. The design makes the power assembly including PCU (INV, DCC, PDU), on-board charger, electric compressor, high-voltage electric heater, electric, electric vacuum pump and other components smaller in size and lighter in weight, directly increasing the power The power density of the drive system has reached 2.17Kw/Kg including the reducer; and an additional 60L of storage space can be reserved in the front power cabin where the system is concentrated.
Secondly, the electric motor has a faster response time than a fuel engine (especially a turbocharged engine), and the power transmission distance from the electric motor to the wheel is short, and the number of turns (shift gears) is small, which means it can "react quickly" , And has higher transmission efficiency and energy utilization. On the basis of making full use of these two advantages, the response time of Weimar EX5 motor output 100% torque is less than 200 milliseconds, and the transmission efficiency of the power system is as high as 93%, which reduces Transmission energy consumption improves the utilization rate of power, and through logic control, the vehicle's energy recovery utilization rate can reach 90%.
The electronic control system is like the ECU of a fuel engine. It is one of the components that can’t cause problems in any case. Because the workload of the electronic control system of electric vehicles is much heavier than that of the ECU of fuel vehicles, the design complexity of the electronic control system of electric vehicles It's also much higher. To this end, the EX5 electronic control system has a liquid cooling circuit shared with the power system to provide independent cooling for core components such as motors, motor controllers, and electronic control systems to ensure reliable performance.
In addition, the core control device of the EX5 electronic control system uses a multi-core main chip, and the front-end chip adopts ASIL-D certification, and the random failure rate occurs once in 11,400 years; the electronic control software code is 100% automatically generated based on the Simulink/Stateflow model, which is avoided from the side Human error.
"Battery Pack System" of Four TechnologiesAlthough they are all energy storage systems, the fuel tanks of fuel vehicles and the battery packs of electric vehicles are absolutely worlds apart in terms of technology. It is not even an exaggeration to say that when traditional fuel vehicles display their core technologies in the engine and gearbox At the time, the battery pack of electric vehicles was a battleground for the core competitiveness of electric vehicle manufacturers.
Similar to many manufacturers that are currently launching electric vehicles, Weimar has also adopted external suppliers to provide battery chips (currently purchased from four), and independently design and manufacture battery packs, which makes the battery packs it produces have a platform. (Modular), lightweight, high safety and stability design purpose:
Through a rectangular battery module design similar to building blocks and a custom curing boundary interface, the battery module of the Weimar EX5 can accommodate most battery chips from mainstream battery suppliers and has a high energy density (over 140Wh/kg). ), the characteristics of module layout can be flexibly adjusted according to development needs.
On the other hand, the shell of the battery module is made of steel with a tensile strength exceeding 780Mpa. On the one hand, it can control the weight as much as possible. On the other hand, it mainly protects the battery pack from undergoing 16 safety tests (vibration, extrusion, external fire, sea water immersion). , Over-discharge protection, mechanical shock, short-circuit protection, salt spray, etc.) can “survive†unharmed.
In addition, considering that the temperature has a great influence on the working effect of the battery, and the battery will self-heat when discharged, the EX5 is also equipped with the active constant temperature battery thermal management technology independently developed by Weimar. The system uses an independent liquid cooling cycle for each The battery modules are equipped with two battery cell temperature sensors to keep the battery cells within a temperature range of ±2°C to ensure the best performance of the battery cells, and to ensure the consistency and cycle life of the battery pack. In addition, for cold areas, EX5 will also provide an optional battery heating system to warm up the battery pack that has been frozen overnight in winter.
"Three-electric calibration" of the four technologiesThe above three aspects are all original designs obtained by Weimar Motors on the EX5 product through secondary development of the prototype or positive research and development from scratch. This also means that Weimar needs to correct For all the previous work, do a key "finishing"-the three-electric calibration.
Weimar EX5 three-electric calibration involves many scopes, but they are all done independently based on their own products: including the analysis of test requirements, the writing of test plans, and the formation of the final test report. The goal decomposition, refinement, design test plan, selection of test equipment, data collection and analysis constitute Weimar’s own set of "three-electric calibration system". It can be said that this set of highly autonomous power calibration system , Is one of Weimar’s core technologies. Through it, Weimar can detect the development quality of the core three-electric system, just like the bench test carried out by traditional car manufacturers before the product launch, comprehensively verify the performance and reliability of the core system .
The above four technologies surrounding the Weimar three-electric system, we can see a lot of familiar shadows-yes, Weimar and some electric vehicle manufacturers that follow the traditional route are very similar in their strategies. They all use time and market to trade. The core technology and product development leadership of electric vehicles. Here, we can see that after the development of transportation from fuel vehicles to electric vehicles, although the overall technical threshold is lowered, and suppliers can also provide ready-made products simultaneously, they want to ensure their product quality and long-term development profits. Space, low-level design from software design to hardware construction and full-process forward research and development are indispensable.
"Perfect R&D Certification System" of the two platformsAs mentioned before, the calibration system of the three-electric system is one of Weimar’s core technologies, but this is only a part of its vehicle calibration system. In fact, Weimar has completed the development process around EX5. With Sanden System as the core, we adhere to the positive development of the overall product test certification system (WTCS-WM Test CertificaTIon System).
This system covers 9 major verification fields including three power, chassis, safety, NVH, electronics, interior and exterior trim, automatic driving, and intelligent systems. It has 120 vehicle-level tests, 3400 system tests, and more than 14,000 component tests. Among them, there are 3000 tests related to the three-electric system, and finally the Weimar EX5 has an "assessment system" that can achieve good driving performance, excellent environmental adaptability, and meet the needs of all-weather and multi-regional use.
The reason why the editor did not say that EX5 has achieved many of the above features is that this car has not been tested in practice, so the wording is relatively conservative and safe.
"Electric Vehicle Forward Development Platform" of the two platformsWeimar EX5 was born from the AJAX pure electric vehicle development platform. In addition to supporting the current EX5 model, the platform can also be flexibly compatible with the design requirements of other models such as cars and MPVs. This means that the development process of Weimar's next model will save a lot of repetitive work on the basis of EX5, and the time to market will be shortened.
Because it is a platform specifically developed for the needs of electric vehicles, the AJAX platform is more integrated and has more outstanding performance. For example, from the white body to the complete vehicle, the air tightness control of EX5 can reach 78.2SCFM, which is rare in products at this price (referring to fuel vehicles); in addition, front Macpherson + rear variable cross-section torsion The beam suspension scheme can not only increase the energy storage by 10%, but also accommodate the battery thermal management system necessary for electric vehicles; and the integrated hydro-formed rear beam structure and continuously changing cross-beam section can also be used to flexibly and conveniently perform strength and The roll rigidity matching design can better absorb road vibrations of different intensities and enhance the driving experience.
summary:In general, although the Weimar EX5 prototype displayed this time is not the final mass production appearance, it has been improved in detail since the EX5 at the Beijing Auto Show at the beginning of the year, and it has been completely opened up. The core hardware system; of course, the regret left is not without, that is, some of the functions of the car machine software, which are still in the later stage of improvement, still cannot penetrate the "experience closed loop" that Weimar Motors wants to create.
In addition, after the technical explanation of EX5 this time, I also gave the editor enough appetite. The editor is very much looking forward to the opportunity to have a real mass-production finalized product before it is delivered at the end of September: on the one hand, I look forward to seeing the integrated technology and cost of this car from the perspective of "full experience". Time and resources), can it be "worthy of the name".
Secondly, the editor also wants to see if this new era electric car, which is built by a team with the vast majority of members from the traditional car industry, will promote the cost-effectiveness of the new era. The same surprise?
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