At present, electric passenger cars usher in explosive growth, but the winter R134a heat shortage, PTC(electrically-assisted heat) power consumption and other problems caused by the “range anxiety” problem, seriously affect the driving experience of consumers, looking for more efficient heating solutions and more environmentally adaptable thermal management system has become an urgent need for the development of electric passenger cars. At the same time, as countries around the world have introduced laws and regulations to reduce carbon emissions and environmental protection, in this context, CO2 refrigerant and its thermal management system stand out by its environmental protection and superior heating ability at low temperatures, and become the mainstream development direction.

Therefore, as the “heart” of the thermal management system, the research and development of CO2 rotor compressor for thermal management of electric passenger vehicles is crucial, and its performance will directly affect the energy efficiency of the thermal management system and the development and promotion of the new energy vehicle industry. In the project “CO2 rotor Compressor for Thermal Management of Electric Passenger Vehicles”, Weiling automotive components adopt the compression principle of rotor compressor which is more suitable for the high temperature and high pressure characteristics of CO2 refrigerant, and carry out innovative design for its structure, pressure resistance and lubrication, combined with lightweight and high-torque motor design and integrated frequency converter software and hardware design. Equipped with high-strength, high-density and lightweight aluminum alloy shell structure, it successfully solved the technical problems of compressor leakage, pressure resistance and temperature resistance under high temperature and high pressure working conditions, and developed the world’s first rotor compressor for electric passenger cars with high efficiency, high reliability, low noise and low cost.
It is reported that this product is the first time in the history of passenger cars to use rotor compressors, and also opens the door to the next generation of environmentally friendly refrigerant thermal management market for rotor compressor-related

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industries. In terms of performance, according to the tests of IPETRONIK, a German testing organization, Midea Weling CO2 rotor compressors for automotive components are leading in the key performance parameters of design conditions, such as energy efficiency ratio, noise, vibration, pulsation and oil spitting rate, compared with existing scroll, swash plate and piston CO2 compressors. Committee experts agreed that: the project technical difficulty, high level of originality, the development of electric passenger car CO2 rotor compressor to reach the international leading level, agreed to pass the identification.

At present, the project has applied for 296 patents, 21 PCT inventions, 64 authorized patents for inventions, 125 utility models, and 58 relevant standards. In the manufacture of CO2 rotor compressor, Weiling auto parts electric compressor production line adopts European standard design, in line with CE standard; In the production workshop, the use of digitalization, robotization, and combined with Rhein IATF16949 process guidance, the establishment of the whole process of visual information management of intelligent production system, the formation of high quality, high efficiency, high stability, short delivery of lean manufacturing model, can quickly respond to various changes in market demand.

As an important layout of the new energy vehicle strategy of Midea Group (000333), Welling Auto Parts is committed to providing first-class core components and system solutions for green travel, and layout incremental components in the three fields of thermal management, electric drive and chassis execution system. Products include electric compressor, thermal management integrated module, drive motor, EPS steering motor, electronic oil pump, electronic water pump, electronic expansion valve, solenoid valve, etc. With the goal of creating high standards, high performance and high reliability products, Midea Weiling auto parts aims to solve the pain points of short life, slow charging and high energy consumption of new energy vehicles at the same time, it will also make great strides towards becoming an innovation-driven automotive core parts supplier in the new era.