Study on retarding effect of water mist containing additive on thermal runaway of lithium battery
In order to investigate the retarding effect of water mist containing a nonionic surfactant on the thermal runaway phenom-enon in lithium battery,this study focuses on optimizing the cool-ing and fire extinguishing performance of water mist by incorporat-ing nonionic surfactants(FS 3100,Tween 80,APG 0810)into the water mist for 18650 ternary lithium-ion battery.The effects of different additives on the maximum temperature,average heat-ing rate,average cooling rate,and cooling time of the lithium bat-tery were compared and analyzed.Additionally,the cooling mechanism and reasons for negative inhibition were examined from the perspectives of surface tension,contact angle,and foam-ing properties.The results demonstrate that the three nonionic surfactants effectively enhance the capacity of water mist to sup-press thermal runaway in lithium battery:FS 3100<Tween 80<APG 0810.APG 0810 primarily reduces the surface tension and contact angle of water mist to enhance the wettability and heat absorption capacity of water mist towards lithium battery.The main function of Tween 80 is to enhance foaming ability.The foam generated by Tween 80 exhibits low stability and brittle-ness,leading to significant heat dissipation during foam bursting and making it difficult for the foam to adhere to the surface of the battery.Consequently,this effectively improves the suppression of lithium battery heating rate during thermal runaway.There-fore,in order to enhance the retarding effect of water mist on the thermal runaway of lithium battery through the addition of non-ionic surfactants,it is necessary to not only reduce surface tension but also appropriately increase the foaming multiple and the brittleness of the foam.
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NSTL
万方数据
维普
