The thermal safety of power battery is one of the key issues affecting the safety of electric vehicles. According to the website of the Ministry of Science and Technology, the development and industrialization of high-energy-powered lithium-ion batteries in the 2016 “New Energy Vehicles†special project “National Key Research and Development Program†In the implementation of technical research, the R&D team has conducted in-depth research on the thermal safety mechanism and safety design of high-energy lithium-ion battery, and has made progress in stages.
It is understood that the project team focused on the heat generation process of lithium-ion battery during charge and discharge, and the thermal stability of each component. The 1Ah lithium-ion battery cell was used as the research object, and the apparent thermal conductivity and anisotropy thermal conductivity were obtained through experiments. The constant heat ratio heat capacity, temperature coefficient and room temperature internal resistance are used to calculate the birth heat rate. The thermal stability of the positive and negative materials and the thermal stability of the electrolyte in the state of 100% charge and 0% charge were analyzed qualitatively. In the thermal runaway part of the battery, the thermal runaway experiment was carried out on the soft-packed lithium ion battery with 100% charge, and the thermal runaway start temperature, maximum temperature and self-heating rate of the battery were determined. The relevant research results and test results provide a theoretical and data basis for the thermal safety structure design of power batteries. The project team focused on the application process and technology of thermosetting polymer materials and positive temperature coefficient heat sensitive materials (PTC materials) in battery cells, combined with physical and chemical analysis tests, electrochemical tests, electrical performance tests and battery safety performance tests. The application process of thermosetting polymer materials in the battery has achieved the purpose of optimizing the application process. The modification concentration, modification method and coating thickness of the positive temperature coefficient thermosensitive material (PTC material) are studied. The impact of performance, which in turn optimizes the application process and technology of PTC materials. At present, the research results of the project provide process and technical guidance for the application of thermosetting polymer materials and PTC materials in battery cells, and solve the basic technology and key technologies for the application of thermosetting polymer materials and PTC materials in battery cells. Solved the problem of thermal runaway of battery cells laid a good foundation.
Weapon Flashlight & Laser,Rechargeable Flashlight For Emergency,Flashlight Usb Rechargeable,Vertical Grip Flashlight Fot Ar
Guangzhou Miaozhun Jie Trade Co.,Ltd. , https://www.focuhunter.shop