Thermal management system is highly desirable to guarantee the performance and thermal safety of lithium-ion batteries,but it reduces the energy density of battery modules and even is unable to provide highly effectiv...Thermal management system is highly desirable to guarantee the performance and thermal safety of lithium-ion batteries,but it reduces the energy density of battery modules and even is unable to provide highly effective protection.Here,a thermal management function integrated material is presented based on high-temperature resistant aerogel and phase change material and is applied at both charge–discharge process and thermal runaway condition.In this sandwich structure Paraffin@SiC nanowire/Aerogel sheet (denoted as PA@SAS) system,SiC nanowires endow the middle aerogel sheet (SAS) a dual nano-network structure.The enhanced mechanical properties of SAS were studied by compressive tests and dynamic mechanical analysis.Besides,the thermal conductivity of SAS at 600°C is only 0.042 W/(m K).The surface phase change material layers facilitate temperature uniformity of batteries (surface temperature difference less than 1.82°C) through latent heat.Moreover,a large-format battery module with four 58 Ah LiNi0.5Co0.2Mn0.3O2LIBs was assembled.PA@SAS successfully prevents thermal runaway propagation,yielding a temperature gap of 602°C through the 2 mm-thick cross section.PA@SAS also exhibits excellent performance in other safety issues such as temperature rise rate,flame heat flux,etc.The lightweight property and effective insulation performance achieves significant safety enhancement with mass and volume energy density reduction of only 0.79%and 5.4%,respectively.The originality of the present research stems from the micro and macro structure design of the proposed thermal management material and the combination of intrinsic advantages of every component.This work provides a reliable design of achieving the integration of thermal management functions into an aerogel composite and improves the thermal safety of lithium-ion batteries.展开更多
室外通讯机柜的结露问题严重影响设备的正常运行。某室外机柜因为锈蚀而发生短路现象,实地监测机柜的温湿度,分析结露原因,发现柜内相对湿度较大,环境温度降低时水蒸气易冷凝。考虑柜内存在热扩散现象,采用加保温材料来提高空气温度,降...室外通讯机柜的结露问题严重影响设备的正常运行。某室外机柜因为锈蚀而发生短路现象,实地监测机柜的温湿度,分析结露原因,发现柜内相对湿度较大,环境温度降低时水蒸气易冷凝。考虑柜内存在热扩散现象,采用加保温材料来提高空气温度,降低相对湿度,防止水蒸气凝结。对机柜进行数值模拟和湿度计算,发现柜内温度升高,相对湿度从85.5%下降到80%,基本符合欧洲通讯机柜环境测试标准ETSI EN 300 019-1-3。实际测试也表明该方法能有效降低空气的相对湿度,改善结露问题。展开更多
基金Collaborative Innovation University Project of Anhui Province (GXXT-2022-018)National Natural Science Foundation of China (52374238 and 52074253)+3 种基金Natural Science Foundation of Anhui Province (2108085J28)Taishan Industrial Leading Talent Project (2019TSCYCX-27)Major Science and Technology Projects of Anhui Province(202103a05020011)Youth Innovation Promotion Association(CX2320007001)。
文摘Thermal management system is highly desirable to guarantee the performance and thermal safety of lithium-ion batteries,but it reduces the energy density of battery modules and even is unable to provide highly effective protection.Here,a thermal management function integrated material is presented based on high-temperature resistant aerogel and phase change material and is applied at both charge–discharge process and thermal runaway condition.In this sandwich structure Paraffin@SiC nanowire/Aerogel sheet (denoted as PA@SAS) system,SiC nanowires endow the middle aerogel sheet (SAS) a dual nano-network structure.The enhanced mechanical properties of SAS were studied by compressive tests and dynamic mechanical analysis.Besides,the thermal conductivity of SAS at 600°C is only 0.042 W/(m K).The surface phase change material layers facilitate temperature uniformity of batteries (surface temperature difference less than 1.82°C) through latent heat.Moreover,a large-format battery module with four 58 Ah LiNi0.5Co0.2Mn0.3O2LIBs was assembled.PA@SAS successfully prevents thermal runaway propagation,yielding a temperature gap of 602°C through the 2 mm-thick cross section.PA@SAS also exhibits excellent performance in other safety issues such as temperature rise rate,flame heat flux,etc.The lightweight property and effective insulation performance achieves significant safety enhancement with mass and volume energy density reduction of only 0.79%and 5.4%,respectively.The originality of the present research stems from the micro and macro structure design of the proposed thermal management material and the combination of intrinsic advantages of every component.This work provides a reliable design of achieving the integration of thermal management functions into an aerogel composite and improves the thermal safety of lithium-ion batteries.
文摘室外通讯机柜的结露问题严重影响设备的正常运行。某室外机柜因为锈蚀而发生短路现象,实地监测机柜的温湿度,分析结露原因,发现柜内相对湿度较大,环境温度降低时水蒸气易冷凝。考虑柜内存在热扩散现象,采用加保温材料来提高空气温度,降低相对湿度,防止水蒸气凝结。对机柜进行数值模拟和湿度计算,发现柜内温度升高,相对湿度从85.5%下降到80%,基本符合欧洲通讯机柜环境测试标准ETSI EN 300 019-1-3。实际测试也表明该方法能有效降低空气的相对湿度,改善结露问题。
