With the attention of the governments of all countries, the new energy automobile industry is developing rapidly. The new energy vehicles born out of traditional automobiles are similar in form to traditional automobiles, but there are many internal changes, which creates huge room for optimization and improvement. The efficient use of high-precision, high-quality, comprehensive and unified auxiliary design tools in the emerging design field can bring continuous and rapid development of enterprise technology.
Industry problemsThe new energy vehicle system has a complex composition, involving different physical domains such as electricity, magnetism, control, machinery, and fluids; and different design departments such as general, mechanical, pneumatic appearance, electronic and electrical. How to comprehensively evaluate the electromagnetic, structural, temperature rise and other performance of each key component; how to comprehensively evaluate the compatibility of the system and the components; how to coordinate the design in each design department? The above problems involve horizontal multi-domain design and vertical multi-level design, and even need to consider issues such as process and data management.
New energy vehicle power systems are all provided with high-performance traction motors to provide torque output. In the process of simulation design and research and development, complex and multi-physical problems in many fields such as fluid, structure, temperature, electromagnetic and control are involved.
The new energy vehicle power battery is a brand-new component, and the safety of the trial process and the management of the service life are mainly considered in the design stage. The two are most relevant to the collision safety of the car and the thermal management of the battery. Collision safety involves the safe use of the battery, and the thermal management of the battery pack greatly affects the overall life and cruising range of the battery pack.
The vehicle-level EMC test standards mainly limit the EMC performance of the vehicle when the vehicle-mounted transmitter and external radiation source are working. There are a large number of electronic devices in the car, and new energy vehicles are even more likely to become sources of radiation interference or interfered with, such as motors, converters, various antennas, ECUs, etc., with various types, wide spectrum spans, and diverse installation locations . If the EMC problems are compressed in the final design stage of the vehicle, the designer needs to pay more.
solutionFor all aspects of new energy vehicles, Nexperia Asia Pacific provides unified and accurate analysis systems and solutions.
1. Heat dissipation of lithium battery
ANSYS Fluent has customized the MSMD model for single lithium batteries, and built-in three 1D electrochemical models to calculate the current and heat generation inside the battery, which can also be used to solve the electrochemical reaction process through a custom program. The MSMD model can greatly simplify the thermal analysis process of a single cell, and its calculation accuracy can also meet engineering requirements.
ANSYS Fluent analyzes the thermal management of lithium-ion battery packs. The main problems are the working temperature and battery temperature uniformity. This temperature uniformity can be divided into the uniformity within the battery module and the temperature uniformity between the modules. In the thermal analysis of battery packs, ANSYS CFD has its huge advantages:
The first is the advantages of simplified model processing. The internal structure of the battery pack is usually very complicated, including details such as bolts, support structure, and copper sheets. The key parts required in thermal analysis, such as heat exchange runners, batteries, etc., are wrapped Under these complex structures, they need to be extracted for CFD calculations. Using ANSYS Space Claim geometric modeling and repair tools can simplify the geometric model more professionally and quickly, and get the model for calculation.
The second is the advantage of the solver model. The flow equation in ANSYS Fluent is coupled with the electrochemical equation of the MSMD model to obtain a more accurate temperature distribution and guide the heat transfer design more accurately.
Magna International Hybrid Electric Vehicle Battery Pack Thermal Management Simulation
Design of the cooling system for the battery pack of a fully hybrid electric vehicle jointly developed by Ford and Delphi
Battery module air duct optimization case
For the battery pack, structural strength analysis is also required, such as flipping, impact, and drop analysis. Try the ANSYS analysis software to observe the structural performance of the battery pack in various working conditions, which is fast, safe and feasible.
Li-ion battery pack drop analysis results
2. Analysis of electric drive system
New energy vehicle motor and drive/control system design includes electrical, electromagnetic, thermal, fluid, structure, noise, control and other multi-physical, multi-level, integrated design content. There is an urgent need to introduce new motor design solutions through platformization The method of forming a digital R&D environment that integrates multi-physics collaborative design tools and combines high-performance computing technology and multi-disciplinary optimization technology.
Motor body design
According to the development trend, research and development requirements and technical challenges of permanent magnetization, brushlessness, high-speed, high-efficiency and energy-saving of the motor body, all aspects of the motor body design are fully considered, including: the rapid design of the motor based on the magnetic circuit method, and the initial plan evaluation And optimization design; motor accurate analysis and parameterization/optimization design based on transient electromagnetic field finite element analysis; thermal, stress, and deformation analysis based on finite element; fluid thermal analysis and cooling system optimization based on finite volume method; based on electromagnetic and thermal , Multi-physics coupling design of structure single/bidirectional coupling; coupling design based on electromagnetic, vibration, and noise automation design process, etc.
Through the rapid optimization of traditional motor design schemes, high efficiency and energy saving are achieved; through efficient exploration and accumulation of brushless and permanent magnet motor design experience, brushless and permanent magnetization are achieved; through optimization of the design of the electromagnetic and multi-physical field coupling of the motor at high speed Features to achieve high speed.
Multi-physics coupling design of motor electromagnetic, structure, heat
Multi-field coupling calculation of motor structure, thermal, acoustic and electromagnetic field analysis under the unified platform of ANSYS
EMC/EMI electromagnetic compatibility and interference analysis In the research and development of modern electric drive systems, electromagnetic compatibility and interference have increasingly become design bottlenecks. Take the EV/HEV electric drive system as an example: the traction motor runs at high speed, and the high-power IGBT switches at a frequency of tens of KHz. The high and low frequency electromagnetic interference will directly affect the detection and conduction of various control signals; cables, IGBTs, mother Parasitic parameters such as row and PCB critical path routing will also directly affect the conduction of various power and control signals; PCB control board-level signal crosstalk and electromagnetic radiation interference; various on-board electromagnetic equipment are distributed in the limited car body space and interact with each other. There is also electromagnetic interference between the devices, which affects the performance of the equipment; various high and low frequency induction, radiation and conduction interferences on the vehicle will not only affect the performance of the electromagnetic equipment, but also easily cause the control system to malfunction or lose control, affect the performance of the entire vehicle, and even cause malfunctions. Accident; how to effectively design various common mode and differential mode filters, IGBT and controller packaging, vehicle electromagnetic equipment layout, and various electromagnetic shielding measures have become critical. Therefore, to develop a high-quality electric drive system, it is necessary to solve the electromagnetic compatibility design problem.
ANSYS electromagnetic series software analyzes different ministerial levels and unifies the virtual experimental environment
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