摘要
锂离子电池具有潜在热失控风险,单体热蔓延导致模组甚至整包起火燃烧,造成人员伤亡和财产损失,是当前阻碍电动汽车推广使用的棘手问题。本研究提出了一种多孔隔热板结构设计理念,利用孔内静止空气的低导热特性,作为单体间夹层以阻隔热蔓延。首先,分析了多孔隔热板的两种热量传播途径:固体传热和气体传热,仿真研究了隔热板在不同厚度与不同孔面积占比下的热蔓延特性,并通过试验验证了孔面积占比对热蔓延的延时效果。结果表明:相同厚度下,隔热板的孔面积占比越大,热失控阻隔效果越好;3mm厚、孔面积占比为42.12%的隔热板,热蔓延时间相比同厚度无孔隔热板可以延长51%;此外,多孔隔热板表现出较高的结构强度,在电池热失控发生鼓包时不易被压溃,阻止相邻单体直接接触传热。多孔隔热板取材容易、结构简单、易于加工,为未来电池模组的结构安全设计提供参考。
Lithium-ion batteries have the potential risk of thermal runaway,and a single heat spread can result in the burning of the module or whole package,causing casualties and loss of property,which is a thorny problem that currently hinders the adoption and use of electric vehicles.In this study,a design concept of a porous thermal insulation boardis proposed.This concept uses the low thermal conductivity of the static air in the hole as a sandwich layer between the monomers to prevent heat spread.First,two heat transmission paths of porous heat insulation plates were analyzed:solid heat transfer and gas heat transfer.The heat propagation characteristics of the heat insulation plate under different thicknesses and different hole area ratios were simulated,and the delayed effect of the hole area ratio on heat propagation was verified by experiments.The results showed that at the same thickness,the larger the hole area ratio of the heat insulation plate,the better the thermal runaway barrier effect.The heat spread time within a 3-mm-thick heat insulation board with a 42.12%hole area was 51%higher than that of a non-porous heat insulation board with the same thickness.In addition,the porous heat insulation plate exhibited high structural strength,which could not easily crushable when the battery thermal runaway occurs,preventing the direct contact of adjacent monomer heat transfer.The materials for manufacturing porous heat insulation plates are readily available,it has a simple structure and is easy to process,thereby offering valuable guidance for the structural safety design of future battery modules.
作者
李和雨
洪小波
陈子涵
阮殿波
LI Heyu;HONG Xiaobo;CHEN Zihan;RUAN Dianbo(School of Mechanical Engineering and Mechanics;Institute of Advanced Energy Storage Technology and Equipment,Ningbo University,Ningbo 315211,Zhejiang,China)
出处
《储能科学与技术》
北大核心
2025年第2期479-487,共9页
Energy Storage Science and Technology
基金
宁波市重大科技任务攻关项目(2022Z206),浙江省科技计划项目(2022C01072)。
关键词
锂离子电池
热失控蔓延
隔热板
多孔结构
孔占比
lithium-ion batteries
thermal runaway spread
heat insulation board
porous structure
hole area ratio
作者简介
第一作者:李和雨(2001-),男,硕士研究生,研究方向为电池系统热失控防控技术,E-mail:lhybka@163.com;通信作者:阮殿波,教授,研究方向为超级电容器及先进储能技术,E-mail:ruandianbo@nbu.edu.cn。
