Effect of safety valve types on the gas venting behavior and thermal runaway hazard severity of large-format prismatic lithium iron phosphate batteries  

作　　者：Zhuangzhuang Jia Yuanyuan Min Peng Qin Wenxin Mei Xiangdong Meng Kaiqiang Jin Jinhua Sun Qingsong Wang 

机构地区：[1]State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,Anhui,China [2]Gotion High-Tech Co.,Ltd.,Hefei 230012,Anhui,China

出　　处：《Journal of Energy Chemistry》2024年第2期195-207,I0006,共14页能源化学（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFB2402001);the Postgraduate Innovation and Entrepreneurship Practice Project of Anhui Province(No.2022cxcysj013);the China Postdoctoral Science Foundation(No.2022T150615);the Fundamental Research Funds for the Central Universities(No.WK5290000002);supported by Youth Innovation Promotion Association CAS(No.Y201768)。

摘　　要：The safety valve is an important component to ensure the safe operation of lithium-ion batteries(LIBs).However,the effect of safety valve type on the thermal runaway(TR)and gas venting behavior of LIBs,as well as the TR hazard severity of LIBs,are not known.In this paper,the TR and gas venting behavior of three 100 A h lithium iron phosphate(LFP)batteries with different safety valves are investigated under overheating.Compared to previous studies,the main contribution of this work is in studying and evaluating the effect of gas venting behavior and TR hazard severity of LFP batteries with three safety valve types.Two significant results are obtained:(Ⅰ)the safety valve type dominates over gas venting pressure of battery during safety venting,the maximum gas venting pressure of LFP batteries with a round safety valve is 3320 Pa,which is one order of magnitude higher than other batteries with oval or cavity safety valve;(Ⅱ)the LFP battery with oval safety valve has the lowest TR hazard as shown by the TR hazard assessment model based on gray-fuzzy analytic hierarchy process.This study reveals the effect of safety valve type on TR and gas venting,providing a clear direction for the safety valve design.

关 键 词：Lithium iron phosphate battery Safety valve Thermal runaway Gas venting behavior Thermal runaway hazard severity Gray-fuzzy analytic hierarchy process 

分 类 号：TM912[电气工程—电力电子与电力传动]