With the increasing awareness of environmental protection and the deepening energy crisis, new energy electric vehicles have become a hot spot of concern at home and abroad. As the main development direction of electric vehicles, lithium batteries are highly favored for their high energy density, long life, low self-discharge and other advantages. However, with the increase of battery energy density and the development of higher power charging technology, the risk of thermal runaway of power lithium-ion batteries is gradually increasing. Studies have shown that at extreme temperatures (both high and low), lithium-ion batteries are prone to thermal runaway, and generate a large amount of heat and buildup during the charging and discharging process, which can affect their service life and may lead to explosions or fire accidents. Therefore, Battery Thermal Management System (BTMS), as a key technology to prevent overheating of Li-ion batteries, has been highly emphasized in academia and industry.

From April 18th to 19th, "2024 Electrical Field Proficiency Verification and Testing Technology Exchange Activity and 2024 Academic Activity of Electronic and Electrical Appliances Branch of China Society for Testing and Inspection" organized by China Household Electric Appliances Research Institute (CHERI) was held in Beijing. At this event, the China Society of Testing and Inspection unveiled the results of the "Second Quality Control Pioneer Evaluation of Electrical and Electronic Laboratories", and TCL Air Conditioning Test Center was awarded the "Quality Control Pioneer Honor Award" for electrical and electronic laboratories.

An air-conditioning pressure switch is an electronic component designed for air-conditioning systems, which is mainly used to monitor and respond to changes in the pressure of refrigerant (e.g. Freon) within the refrigeration system. This switch is based on pressure sensing technology, when the detected pressure reaches a preset threshold, it will trigger the corresponding open and close action, output a digital quantity (i.e., switching signal), in order to control or indicate the operating status of the air conditioning system, to ensure the safe and efficient operation of the system, and to prevent damage to the equipment or degradation of performance due to abnormal pressure.

Judge the pressure switch is good or bad, can use the multimeter on and off gear to measure the high pressure protection switch whether the conductive, conductive means good, not pass means bad. Air conditioning equipment if high pressure protection, you can refer to the following reasons:

Energy efficiency of farmhouse buildings is one of the important contents of current village construction. Based on the on-site research of farm houses in the northern region, this paper researches the energy-saving renovation scheme of the enclosure structure of farm houses, and proposes and designs the optimization method of menu selection of energy-saving schemes. The method takes into account the energy-saving effect of different insulation solutions and the affordability of farmers, and can not only give the optimal solution for energy-saving renovation of the farmhouse envelope under a certain budget investment, i.e., "recommended dishes", but also according to the user's "self-selected dishes", which intuitively reflects the initial investment and the corresponding cost. It can also reflect the initial investment and the corresponding energy saving rate intuitively. The menu approach is efficient, flexible and universal, and has practical value for the determination of energy-saving retrofit programs for rural building envelopes in China.

As a leader in the industry of efficient and sustainable green intelligent buildings, Haier Smart Building aims to join hands with building ecological partners to explore the green ecological future.

The 35th China Refrigeration Expo scheduled to take place from April 8 to 10 at the China International Exhibition Center (Shunyi Hall) in Beijing. Under the theme “More Digital Intelligence and Emerging Tracks for Win-win Growth,” this exhibition has drawn participation from over 1,000 well-known brands and upstream and downstream industry enterprises within the global HVACR sector, representing 27 countries.