With the gradual elimination of the environmental toxicity of halon fire extinguishing agents, water mist fire extinguishing technology has been widely used for its environmental protection and high efficiency, and plays an increasingly important role in fire extinguishing. In this study, computational fluid dynamics model and fire dynamics simulator (FDS) were used to analyze the influence of droplet size and spray flow rate, two main factors affecting the filling volume of water mist space, on the fire extinguishing effect. The results show that when the limit water mist space filling volume is 6.57 × 10, it can effectively extinguish the 200Kw room fire. As the droplet size increases, the fire extinguishing time becomes longer, and the smaller the droplet size, the stronger the ability to isolate oxygen; as the flow rate of the nozzle increases, the fire extinguishing time becomes shorter. By reducing the droplet diameter or increasing the flow rate, the extinguishing time can be reduced.
With the rapid development of new energy vehicles, people pay more and more attention to the safety problems caused by lithium-ion batteries. If they are not solved, this will inevitably affect the popularization of new energy vehicles in my country. This article introduces the current research progress of thermal runaway of lithium batteries. Firstly, it analyzes the causes of thermal runaway of lithium batteries from the perspective of kinetics, and then focuses on the analysis of the mechanism of battery thermal runaway caused by internal short circuit, external short circuit, overcharge, and overdischarge. In view of the main research progress in these aspects, finally put forward suggestions for the research of lithium batteries.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.