环氧树脂板对锂离子电池热失控扩展的阻隔作用
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摘要
动力电池热失控扩展阻隔是抑制大规模电池火灾的重要途径。本文采用环氧树脂板(ERB)阻隔锂离子电池的热失控扩展,分析不同厚度ERB对串联及并联模组的热失控阻隔作用。结果表明,ERB可降低热失控电池模组的最高温度,减轻电池热失控剧烈程度,避免喷射火焰的产生;对于并联的电池模组,采用2 mm ERB的锂电池模组的电池间热失控扩展平均时间间隔为198s,为无ERB时的2.29倍,采用4mmERB时平均时间间隔延长至无ERB时的5.57倍;对于串联的电池模组,采用2 mm ERB时电池热失控扩展平均时间间隔延长至无ERB锂电池模组的2.09倍,采用4 mm ERB时可完全阻止热失控扩展;研究发现并联的电池模组相对于串联模组更容易扩展,其原因为并联模组单个电池热失控时会形成电回路并产生焦耳热。
Fires and explosive hazards of lithium-ion batteries resulted from thermal runaway(TRA)propagations presented threats on the public safety. In order to prevent large-scale hazard of battery systems, one effective method is TRA mitigation. In this work, epoxy resin board(ERB) was applied to mitigate the TRA propagation of prismatic battery modules. It was found that ERB can lower the highest temperature of the battery module, mitigate the TRA severity of the batteries, and avoid the generation of the jet ?ames. For the module with parallel electric connection, the average TRA propagation time was 198 s per battery number when 2 mm ERB was applied, which was 2.29 times compared to that without ERB. And it was extended to 5.57 times when 4 mm ERB was used.For the module with series electric connection, the average thermal runaway propagation time was extended to 2.09 times with 2 mm ERB applied. While TRA propagation was prevented when 4 mm ERB was used, which meant thermal runaway was more easily propagated in module with parallel connection than that with series connection, because of the additional joule heat caused by the formed electrical circuit.
Fires and explosive hazards of lithium-ion batteries resulted from thermal runaway(TRA)propagations presented threats on the public safety. In order to prevent large-scale hazard of battery systems, one effective method is TRA mitigation. In this work, epoxy resin board(ERB) was applied to mitigate the TRA propagation of prismatic battery modules. It was found that ERB can lower the highest temperature of the battery module, mitigate the TRA severity of the batteries, and avoid the generation of the jet ?ames. For the module with parallel electric connection, the average TRA propagation time was 198 s per battery number when 2 mm ERB was applied, which was 2.29 times compared to that without ERB. And it was extended to 5.57 times when 4 mm ERB was used.For the module with series electric connection, the average thermal runaway propagation time was extended to 2.09 times with 2 mm ERB applied. While TRA propagation was prevented when 4 mm ERB was used, which meant thermal runaway was more easily propagated in module with parallel connection than that with series connection, because of the additional joule heat caused by the formed electrical circuit.
引文
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[2]FENG X,OUYANG M,LIU X,et al.Thermal runaway mechanism of lithium ion battery for electric vehicles:A review[J].Energy Storage Materials,2018:246-267.
[3]王芳,林春景,刘磊,等.动力电池安全性的测试与评价[J].储能科学与技术,2018,7(6):967-971.WANG Fang,LIN Chunjing,LIU Lei,et al.Test and evaluation on safety of power batteries[J].Energy Storage Science and Technology,2018,7(6):967-971.
[4]PING P,WANG Q,HUANG P,et al.Study of the fire behavior of highenergy lithium-ion batteries with full-scale burning test[J].Journal of Power Sources,2015,285:80-89.
[5]陈天雨,高尚,冯旭宁,等.锂离子电池热失控蔓延研究进展[J].储能科学与技术,2018,7(6):1030-1039.CHEN Tianyu,GAO Shang,FENG Xuning,et al.Recent progress on thermal runaway propagation of lithium-ion battery[J].Energy Storage Science and Technology,2018,7(6):1030-1039.
[6]WU T,CHEN H,WANG Q,et al.Comparison analysis on the thermal runaway of lithium-ion battery under two heating modes[J].Journal of Hazardous Materials,2018,344:733-741.
[7]JHU C Y,WANG Y W,WEN C Y,et al.Thermal runaway potential of LiCoO2 and Li(Ni1/3Co1/3Mn1/3)O2 batteries determined with adiabatic calorimetry methodology[J].Applied Energy,2012,100:127-131.
[8]冯旭宁.车用锂离子动力电池热失控诱发与扩展机理、建模与防控[D].北京:清华大学,2016.FENG Xuning.Thermal runaway initiation and propagation of lithium-ion traction battery for electric vehicle:Test,modeling and prevention[D].Beijing:Tsinghua University,2016.
[9]LAMB J,ORENDORFF C J,STEELE L A M,et al.Failure propagation in multi-cell lithium ion batteries[J].Journal of Power Sources,2015,283:517-523.
[10]FENG X,SUN J,OUYANG M,et al.Characterization of penetration induced thermal runaway propagation process within a large format lithium ion battery module[J].Journal of Power Sources,2015,275:261-273.
[11]FENG X,HE X,OUYANG M,et al.Thermal runaway propagation model for designing a safer battery pack with 25A?h LiNixCoyMnzO2large format lithium ion battery[J].Applied Energy,2015,154:74-91.
[12]WILKE S,SCHWEITZER B,KHATEEB S,et al.Preventing thermal runaway propagation in lithium ion battery packs using a phase change composite material:An experimental study[J].Journal of Power Sources,2017,340:51-59.