Passive battery thermal management and thermal safety protection based on hydrated salt composite phase change materials  

作　　者：Jingshu Zhang Qian Liu Xiaole Yao Chen Sun Xiaoqing Zhu Chao Xu Xing Ju 

机构地区：[1]Beijing Laboratory of New Energy Storage Technology,North China Electric Power University,Beijing 102206,China

出　　处：《Energy Storage and Saving》2024年第4期305-317,共13页储能与节能(英文)

基　　金：the National Natural Science Foundation of China(Project No:51821004);the Beijing Natural Science Foundation(Project No.:L242074).

摘　　要：Lithium-ion batteries(LIBs)are progressing towards higher energy densities,extended lifespans,and improved safety.However,battery thermal management systems are facing increased demand owing to high-rate charging and discharging,dynamic operating conditions,and heightened thermal safety concerns.Therefore,this paper proposes a novel composite phase change material(CPCM)comprising Na2SO4–10H2O as the core phase change material(PCM)and expanded graphite as the thermal conductivity enhancer.The CPCM offers high latent heat,superior thermal conductivity,and a two-stage temperature control function for battery thermal management and safety.The optimal mass CPCM ratio,determined through comprehensive characterization and thermal property tests,resulted in a melting point of 29.05℃,latent heat of 183.7 J·g^(-1),and high thermal conductivity of 3.926 W·m^(-1)·K^(-1).During normal LIB operations,the CPCM efficiently absorbs and transfers heat,reducing the peak LIB temperature from 66 to 34℃at 15℃ambient temperature during a 3.7C high-rate discharge.Under dynamic conditions,the peak temperatures across the three cycles were consistently controlled at 36.7,36.4,and 35.8℃,respectively.In a thermal runaway state,the thermochemical heat storage of hydrated salt dehydration effectively slowed LIB temperature increase,delaying the time to reach 130℃by 187 s.Suppression of the temperature rise outside the CPCM,combined with an extended dehydration plateau of up to 320 s,prevented the occurrence and propagation of thermal runaway in the battery.

关 键 词：Battery thermal management system Thermal runaway Lithium-ion battery Composite phase change materials Hydrated salt DEHYDRATION 

分 类 号：TG1[金属学及工艺—金属学]